02702nas a2200337 4500008004100000022001400041245012800055210006900183260007300252300001200325490000700337520156900344653003201913653002601945653001601971653001701987653001402004653001302018653001702031653002302048653001702071653003002088653002002118653000802138100001302146700001502159700001802174700001502192700003002207856012702237 2005 eng d a0926-337300aIn situ XPS investigations of Cu1-xNixZnAl-mixed metal oxide catalysts used in the oxidative steam reforming of bio-ethanol0 aIn situ XPS investigations of Cu1xNixZnAlmixed metal oxide catal aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcFEB a287-2990 v553 a

A series of CuNiZnAl-multicomponent mixed metal oxide catalysts with various Cu/Ni ratios were prepared by the thermal decomposition of Cu1-xNixZnAl-hydrotalcite-like precursors and tested for oxidative steam reforming of bio-ethanol. Dehydrogenation of EtOH to CH3CHO is favored by Cu-rich catalyst. Introduction of Ni leads to C-C bond rupture and producing CO, CO2 and CH4. H-2 yield (selectivity) varied between 2.6-3.0 mol/mol of ethanol converted (50-55%) for all catalysts at 300 degreesC. The above catalysts were subjected to in situ XPS studies to understand the nature of active species involved in the catalytic reaction. Core level and valence band XPS as well as Auger electron spectroscopy revealed the existence of Cu2+, Ni2+ and Zn2+ ions on calcined materials. Upon in situ reduction at reactions temperatures, the Cu2+ was fully reduced to Cu-0. while Ni2+ and Zn2+ were partially reduced to Ni-0 and Zn-0, respectively. On reduction, the nature of ZnO on Cu-rich catalyst changes from crystalline to amorphous, relatively inert and highly stabilized electronically. Relative concentration of the Ni-0 and Zn-0 increases upon reduction with decreasing Cu-content. Valence band results demonstrated that the overlap between 3d bands of Cu and Ni was marginal on calcined materials, and no overlap due to metallic clusters formation after reduction. Nonetheless, the density of states at Fermi level increases dramatically for Ni-rich catalysts and likely this influences the product selectivity. (C) 2004 Elsevier B.V. All rights reserved.

10aauger electron spectroscopy10aAutothermal reforming10aBio-ethanol10acopper oxide10afuel cell10aHydrogen10ahydrotalcite10amixed metal oxides10anickel oxide10aoxidative steam reforming10aSteam reforming10aXPS1 aVelu, S.1 aSuzuki, K.1 aVijayaraj, M.1 aBarman, S.1 aGopinath, Chinnakonda, S. uhttps://library.ncl.res.in/content/situ-xps-investigations-cu1-xnixznal-mixed-metal-oxide-catalysts-used-oxidative-steam-001735nas a2200253 4500008004100000022001400041245010500055210006900160260007100229300001200300490000700312520087800319653002401197653001501221653001301236653001701249653002001266653000801286100001201294700001401306700001701320700001501337856012901352 2006 eng d a1520-610600aRole of halide ions and temperature on the morphology of biologically synthesized gold nanotriangles0 aRole of halide ions and temperature on the morphology of biologi a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcJAN a736-7410 v223 a

{In this paper, we demonstrate the effect of halide ions on the formation of biogenically prepared gold nanotriangles using the leaf extract of lemongrass (Cymbopogonflextiosus) plant. We have also studied the effect of halide ions on the morphology of biogenic nanotriangles. It has been shown that iodide ions have a greater propensity to transform flat gold nanotriangles into circular disklike structures as compared to other halide ions. The study also suggests that the presence of Cl- ions during the synthesis promotes the growth of nanotriangles, whereas the presence of I- ions distorts the nanotriangle morphology and induces the formation of aggregated spherical nanoparticles. The change in the morphology of gold nanotriangles has been explained in terms of the ability of the halide ions to stabilize or inhibit the formation of (I 11) faces to form [

10aDME steam reforming10afuel cells10aHydrogen10aMixed oxides10asupported Ga2O310aXPS1 aRai, A.1 aSingh, A.1 aAhmad, Absar1 aSastry, M. uhttps://library.ncl.res.in/content/role-halide-ions-and-temperature-morphology-biologically-synthesized-gold-nanotriangles-100811nas a2200229 4500008004100000022001400041245007400055210006900129260007700198300001400275490000700289653001500296653001400311653001300325653001300338100001900351700002100370700003100391700002600422700002500448856010800473 2013 eng d a1433-785100aLow-pressure synthesis and characterization of hydrogen-filled ice ic0 aLowpressure synthesis and characterization of hydrogenfilled ice aBOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcDEC a1531-15340 v5210aClathrates10acubic ice10ahydrates10aHydrogen1 aKumar, Rajnish1 aKlug, Dennis, D.1 aRatcliffe, Christopher, I.1 aTulk, Christopher, A.1 aRipmeester, John, A. uhttps://library.ncl.res.in/content/low-pressure-synthesis-and-characterization-hydrogen-filled-ice-ic-002674nas a2200265 4500008004100000022001400041245011200055210006900167260007700236300001200313490000600325520169700331653002802028653001302056653002502069653001902094653002002113100003302133700002502166700001602191700001502207700002702222700003002249856012902279 2014 eng d a1867-388000aDisordered mesoporous TiO2-xNx+Nano-Au: an electronically integrated nanocomposite for solar H-2 generation0 aDisordered mesoporous TiO2xNxNanoAu an electronically integrated aBOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcFEB a522-5300 v63 a

We report on H-2 generation by photocatalysis driven by simulated white light by electronically integrated Au nanoparticles with multifunctional, disordered mesoporous TiO2-xNx (Au-NT) nanocomposites. Solar H-2 generation (1.5 mmolh(-1)g(-1)) from aqueous methanol has been demonstrated with Au-NT nanocomposites. The water splitting activity of Au-NT is attributed to the 21.1 ps lifetime of charge carriers observed from fluorescence lifetime measurements, which indicates a high electron-injection efficiency from nano-Au to the conduction band of TiO2, and hence charge separation as well as utilization. This is directly supported by the observation of a high photoluminescence emission intensity with Au-NT that highlights the energy transfer from nano-Au to TiO2. The p-n heterojunction observed between the Au (001) and TiO2 (101) facets helps to-wards the higher charge separation and their utilization. A low mesochannel depth (< 10 nm) associated with disordered mesoporous TiO2-xNx helps the charge carriers to move towards the surface for redox reactions and hence charge utilization. Visible-light absorption, as a result of the surface plasmon resonance of nano-Au, is observed in a broad range between 500 and 750 nm, which helps in harvesting visible-light photons. Finally, electronically integrated nano-Au with TiO2-xNx in Au-NT is evident from Raman and X-ray photoelectron spectroscopy measurements. All of these factors help to achieve a high rate of H-2 production. It is likely that a higher rate of H-2 production than that reported here is feasible by strategically locating Au clusters in porous TiO2 to generate hot spots through electronic integration.

10aheterogeneous catalysis10aHydrogen10amesoporous materials10aphotochemistry10awater splitting1 aSivaranjani, Kumarsrinivasan1 aRajaambal, Sivaraman1 aDas, Tanmay1 aRoy, Kanak1 aBhattacharyya, Somnath1 aGopinath, Chinnakonda, S. uhttps://library.ncl.res.in/content/disordered-mesoporous-tio2-xnxnano-au-electronically-integrated-nanocomposite-solar-h-2-002129nas a2200253 4500008004100000022001400041245012800055210006900183260007700252300001400329490000600343520121900349653001301568653001101581653001501592653001301607653001401620100002101634700002001655700002501675700001901700700002901719856012701748 2014 eng d a1867-388000aEffect of composition and pretreatment parameters on activity and stability of Cu-Al catalysts for water-gas shift reaction0 aEffect of composition and pretreatment parameters on activity an aBOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcJUN a1698-17060 v63 a

We investigated various Cu species responsible for highly efficient Cu-Al oxide catalyst for the water-gas shift reaction (WGSR). The formation of various Cu species was achieved by systematically varying the Cu-Al composition in the coprecipitated mixed Cu-Al oxides. The Cu-Al composition of 70:30 (Cu-Al-7) was the best for WGSR using the reformate gas composition. In addition, the Cu-Al-7 catalyst reduced under 100% H-2, was relatively stable with time on stream of 100 h, at higher gas hourly space velocity of 36201 h(-1). The structural investigation of our coprecipitated catalysts with varying Cu-Al compositions revealed the formation of nonzero oxidation state copper and metallic Cu to be essential for the observed WGSR activity. In addition, the highest activity and stability of Cu-Al-7 catalysts reduced under 100% H-2 at lower temperature was attributed to particle-size stabilization and a lower extent of Cu aggregation by Cu2O and boehmite phases, respectively, along with the formation of various Cu species during the activation protocol for 12 h. Complete CO2 selectivity without methanation was observed for all the Cu-Al compositions irrespective of their pretreatment conditions.

10aaluminum10aCopper10afuel cells10aHydrogen10areduction1 aMane, Rasika, B.1 aJeong, Dae-Woon1 aMalawadkar, Atul, V.1 aRoh, Hyun-Seog1 aRode, Chandrashekhar, V. uhttps://library.ncl.res.in/content/effect-composition-and-pretreatment-parameters-activity-and-stability-cu-al-catalysts-002120nas a2200289 4500008004100000020004100041022001400082245007300096210006900169260026000238300001000498490000700508520099400515653001101509653001901520653001101539653001301550653001801563653002901581653002101610653001401631100002501645700002001670700001601690700002001706856010401726 2014 eng d a978-3-319-08482-4; 978-3-319-08481-7 a1436-600200aHydrogenation of polar bonds catalysed by ruthenium-pincer complexes0 aHydrogenation of polar bonds catalysed by rutheniumpincer comple aHEIDELBERGER PLATZ 3, D-14197 BERLIN, GERMANYbIEEE Commun Soc; IEEE Syst Man & Cybernet Soc; Galgotias Coll Engn & Technol; Hochschule Offenburg Univ Appl Sci; Int Neural Network Soc; India Chapter & Res Publishing Serv; Madhyam; WizIQ; ICACCI; IEEEcMAR a19-430 v483 a

Catalytic hydrogenation of polar bonds using molecular hydrogen is an important, atom-economical synthetic reaction. Classical reduction methods of polar bond often require reactive metal-hydride reagents in stoichiometric amount and produce copious waste. Hydrogenation of carbonyl compounds in particular provides `green' approaches to synthetically important building blocks, such as alcohols and amines. We have designed and synthesized several ruthenium-based pincer catalysts for unprecedented hydrogenation reactions including: (1) amides to alcohols and amines, (2) biomass-derived di-esters to 1,2-diols and (3) CO2 and CO derivatives to methanol. These atom-economical reactions operate under neutral, homogeneous conditions, at mild temperatures, mild hydrogen pressures, and can operate in absence of solvent with no generation of waste. The postulated mechanisms involve metal-ligand cooperation (MLC) by aromatization-dearomatization of the heteroaromatic pincer core.

10aAmides10aCarbon dioxide10aEsters10aHydrogen10aHydrogenation10aMetal-ligand cooperation10aPincer complexes10aruthenium1 aBalaraman, Ekambaram1 aMilstein, David1 aBruneau, C.1 aDixneuf, P., H. uhttps://library.ncl.res.in/content/hydrogenation-polar-bonds-catalysed-ruthenium-pincer-complexes-002870nas a2200265 4500008004100000022001400041245014500055210006900200260007100269300001400340490000600354520191100360653001202271653002802283653001302311653001402324653001902338653001702357653001402374653002502388100001502413700001602428700003002444856013002474 2014 eng d a2155-543500aTowards a sustainable and near ambient DeNO(x) under lean burn conditions: a revisit to no reduction on virgin and modified pd(111) surfaces0 aTowards a sustainable and near ambient DeNOx under lean burn con a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcJUN a1801-18110 v43 a

Catalytic conversion of NO in the presence of H-2 and O-2 has been studied on Pd(111) surfaces, by using a molecular beam instrument with mass spectrometry detection, as a function of temperature and reactants composition. N-2 and H2O are the major products observed, along with NH3 and N2O minor products under all conditions studied. Particular attention has been paid to the influence of O-2 addition toward NO dissociation. Although O-2-rich compositions were found to inhibit the deNO(x) activity of the Pd catalyst, some enhancement in NO reduction to N-2 was also observed up to a certain O-2 content. The reason for this behavior was determined to be the effective consumption of the H-2 in the mixture by the added O-2 and O atoms from NO dissociation. NO was proven to compete favorably against O-2 for the consumption of H-2, especially <= 550 K, to produce N-2 and H2O. Compared with other elementary reaction steps, a slow decay observed with the 2H + 0 -> H2O step under SS beam oscillation conditions demonstrates its contribution to the rate-limiting nature of the overall reaction. Pd(111) surfaces modified with O atoms in the subsurface (Md-Pd(111)) induces steady-state NO reduction at near-ambient temperatures (325 K) and opens up a possibility to achieve room temperature emission control. A 50% increase in the reaction rates was observed at the reaction maximum on Md-Pd(111), as compared with virgin surfaces. Oxygen adsorption is severely limited below 400 K, and effective NO + H-2 reaction occurs on Md-Pd(111) surfaces. Valence band photoemission with a UV light source (He I) under different oxygen pressures with APPES clearly identified the characteristics of the Md-Pd(111) surfaces and PdO. The electron-deficient or cationic nature of Md-Pd(111) surfaces enhances the NO dissociation and inhibits oxygen chemisorption <= 400 K under lean-burn conditions.

10adeNO(x)10aheterogeneous catalysis10aHydrogen10alean burn10amolecular beam10anitric oxide10aPalladium10asurface modification1 aRoy, Kanak1 aJain, Ruchi1 aGopinath, Chinnakonda, S. uhttps://library.ncl.res.in/content/towards-sustainable-and-near-ambient-denox-under-lean-burn-conditions-revisit-no-reduction02231nas a2200241 4500008004100000022001400041245013600055210006900191260000800260300001200268490000600280520141600286653001101702653001701713653001301730653002201743653001701765100002201782700002201804700001901826700002501845856011901870 2014 eng d a1864-563100aWater electrolysis with a conducting carbon cloth: subthreshold hydrogen generation and superthreshold carbon quantum dot formation0 aWater electrolysis with a conducting carbon cloth subthreshold h cMAR a883-8890 v73 a

A conducting carbon cloth, which has an interesting turbostratic microstructure and functional groups that are distinctly different from other ordered forms of carbon, such as graphite, graphene, and carbon nanotubes, was synthesized by a simple one-step pyrolysis of cellulose fabric. This turbostratic disorder and surface chemical functionalities had interesting consequences for water splitting and hydrogen generation when such a cloth was used as an electrode in the alkaline electrolysis process. Importantly, this work also gives a new twist to carbon-assisted electrolysis. During electrolysis, the active sites in the carbon cloth allow slow oxidation of its surface to transform the surface groups from COH to COOH and so forth at a voltage as low as 0.2V in a two-electrode system, along with platinum as the cathode, instead of 1.23V (plus overpotential), which is required for platinum, steel, or even graphite anodes. The quantity of subthreshold hydrogen evolved was 24mLcm(-2)h(-1) at 1V. Interestingly, at a superthreshold potential (>1.23V+overpotential), another remarkable phenomenon was found. At such voltages, along with the high rate and quantity of hydrogen evolution, rapid exfoliation of the tiny nanoscale (5-7nm) units of carbon quantum dots (CQDs) are found in copious amounts due to an enhanced oxidation rate. These CQDs show bright-blue fluorescence under UV light.

10aCarbon10aelectrolysis10aHydrogen10aphotoluminescence10aquantum dots1 aBiswal, Mandakini1 aDeshpande, Aparna1 aKelkar, Sarika1 aOgale, Satishchandra uhttps://library.ncl.res.in/content/water-electrolysis-conducting-carbon-cloth-subthreshold-hydrogen-generation-and02771nas a2200289 4500008004100000022001400041245013200055210006900187260007300256300001200329490000800341520173600349653001202085653001302097653002302110653001702133653002002150100001702170700002002187700002002207700002402227700002802251700002302279700002202302700003102324856012602355 2015 eng d a0926-337300aHighly loaded well dispersed stable Ni species in NiXMg2AlOY nanocomposites: application to hydrogen production from bioethanol0 aHighly loaded well dispersed stable Ni species in NiXMg2AlOY nan aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcMAY a485-4960 v1663 a

Inexpensive NiXMg2AlOY nanocomposites with high Ni content (Ni wt% > 40%) are developed as efficient catalysts for the sustainable hydrogen production from a mixture of ethanol and water at low temperature. The NiXMg2AlOY nanocomposites are composed of small and uniform nanoparticles (4-6 nm) of NiO, Ni-Mg-(Al)-O and/or MgO. The strong interactions existing between Ni2+ cations and Mg2+ and/or Al3+ cations either in the Ni-Mg-(Al)-O solid solution and/or at the interface of nanoparticles of NiO and/or Ni-Mg-(Al)-O make the catalyst highly active and stable. The behavior of the solids is analyzed in the presence of low and high concentrations of ethanol while maintaining a H2O/EtOH molar ratio of 3. The NiXMg2AlOY catalysts are shown to be efficient toward H-2 production between 250 and 650 degrees C. In the presence of low concentration of ethanol, on the highly loaded Ni compound (Ni12Mg2AlOY), total conversion of ethanol is obtained at 250 degrees C without formation of CO and carbon, and at 300 degrees C a H-2 yield of 3 mol moletEtOH(-1) is obtained without the formation of CO, exhibiting a remarkable stability with the time on stream even if some carbon is formed. In high concentration of ethanol, total conversion of ethanol is obtained at 450 degrees C on the highly loaded Ni compound (Ni12Mg2AlOY). In such conditions, a stable co-generation of carbon nanofibrous materials which amount increases with Ni content is also obtained. The catalytic stability is related to the type and morphology of the carbon species formed. The correlations among the catalyst properties, the catalytic performances and the characterizations are thoroughly discussed. (C) 2014 Elsevier B.V. All rights reserved.

10aEthanol10aHydrogen10aNanofibrous carbon10anickel oxide10aSteam reforming1 aFang, Wenhao1 aPaul, Sebastien1 aCapron, Mickael1 aBiradar, Ankush, V.1 aUmbarkar, Shubhangi, B.1 aDongare, Mohan, K.1 aDumeignil, Franck1 aJalowiecki-Duhamel, Louise uhttps://library.ncl.res.in/content/highly-loaded-well-dispersed-stable-ni-species-nixmg2aloy-nanocomposites-application-002506nas a2200253 4500008004100000022001400041245006900055210006800124260010200192300001000294490000800304520163300312653001301945653001701958653001901975653001601994653001802010653001802028653002002046100002502066700003302091700003002124856009802154 2015 eng d a0974-362600aRecent developments in solar H-2 generation from water splitting0 aRecent developments in solar H2 generation from water splitting aC V RAMAN AVENUE, SADASHIVANAGAR, P B \#8005, BANGALORE 560 080, INDIAbINDIAN ACAD SCIENCEScJAN a33-470 v1273 a

Hydrogen production from water and sunlight through photocatalysis could become one of the channels, in the not-so-distant future, to meet a part of ever growing energy demands. However, accomplishing solar water splitting through semiconductor particulate photocatalysis seems to be the `Holy Grail' problem of science. In the present mini-review, some of the critical strategies of semiconductor photocatalysis are focused with the aim of enumerating underlying critical factors such as visible light harvesting, charge carrier separation, conduction and their utilization that determine the quantum efficiency. We attempted to bring out the essential requirements expected in a material for facile water splitting by explaining important and new designs contributed in the last decade. The newly emerged designs in semiconductor architecture employing nanoscience towards meeting the critical factors of facile photocatalysis are elucidated. The importance of band gap engineering is emphasized to utilize potential wide band gap semiconductors. Assistance of metal nanostructures and quantum dots to semiconductors attains vital importance as they are exuberant visible light harvesters and charge carrier amplifiers. Benevolent use of quantum dots in solar water splitting and photoelectrochemical water splitting provides scope to revolutionize the quantum efficiency by its multiple exciton generation features. A list of drawbacks and issues that hamper the much needed breakthrough in photocatalysis of water splitting is provided to invite attention to address them and move towards sustainable water splitting.

10aHydrogen10ananomaterial10aPhotocatalysis10aquantum dot10aSemiconductor10avisible light10awater splitting1 aRajaambal, Sivaraman1 aSivaranjani, Kumarsrinivasan1 aGopinath, Chinnakonda, S. uhttps://library.ncl.res.in/content/recent-developments-solar-h-2-generation-water-splitting-001928nas a2200241 4500008004100000022001400041245009800055210006900153260000800222300001400230490000600244520110600250653003301356653001601389653001901405653001301424653002501437100002101462700003101483700002001514700002501534856012701559 2018 eng d a2155-543500aPhotocatalysis enabling acceptorless dehydrogenation of diaryl hydrazines at room temperature0 aPhotocatalysis enabling acceptorless dehydrogenation of diaryl h cAUG a7727-77330 v83 a

Aromatic azo compounds are privileged structural motifs, and they exhibit a myriad of pharmaceutical as well as industrial applications. Here, we report a catalytic acceptorless dehydrogenation of diarylhydrazine derivatives to access a wide variety of aryl-azo compounds with the removal of molecular hydrogen as the sole byproduct. This distinctive reactivity has been achieved under dual catalytic conditions by merging the visible-light active [Ru(bpy)(3)](2+) as the photoredox catalyst and Co(dmgH)(2)(py)Cl as the proton-reduction catalyst. The reaction proceeds smoothly under very mild and benign conditions and operates at ambient temperature. This dual catalytic approach is highly compatible with many different functional groups and has a broad substrate scope. We have also demonstrated the reversible hydrogen storage and release phenomenon on hydrazobenzene/azobenzene couple to show the utility of these compounds as hydrogen storage materials. Further diversification of azobenzene was shown by a transition metal-catalyzed azo-group-directed ortho-C-H bond functionalization.

10aacceptorless dehydrogenation10aAzo benzene10adual catalysis10aHydrogen10aphotoredox catalysis1 aSahoo, Manoj, K.1 aSaravanakumar, Krishnasamy1 aJaiswal, Garima1 aBalaraman, Ekambaram uhttps://library.ncl.res.in/content/photocatalysis-enabling-acceptorless-dehydrogenation-diaryl-hydrazines-room-temperature01993nas a2200205 4500008004100000022001400041245012600055210006900181260000800250520124400258653001101502653002101513653002801534653001301562653002001575100002101595700002001616700002401636856012701660 2019 eng d a1864-563100aGlycine-induced electrodeposition of nanostructured cobalt hydroxide: a bifunctional catalyst for overall water splitting0 aGlycineinduced electrodeposition of nanostructured cobalt hydrox cNOV3 a

Herein, an interconnected alpha-Co(OH)(2) structure with a network-like architecture was used as a bifunctional electrocatalyst for the overall water splitting reaction in alkaline medium. The complexing ability of glycine with a transition metal was exploited to form [Co(gly)(3)](-) dispersion at pH 10, which was used for the electrodeposition. High-resolution TEM, UV/Vis-diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy were used to confirm that the as-synthesized materials had an alpha-Co(OH)(2) phase. The electrocatalytic oxygen and hydrogen evolution activity of the glycine-coordinated alpha-Co(OH)(2) was found to be approximately 320 and 145 mV, respectively, at 10 mA cm(-2). The material required approximately 1.60 V (vs. reversible hydrogen electrode; RHE) to achieve the benchmark of 10 mA cm(-2) for overall water splitting with a mass activity of approximately 63.7 A g(-1) at 1.60 V (vs. RHE). The chronoamperometric response was measured to evidence the stability of the material for overall water splitting for up to 24 h. Characterization of the catalyst after the oxygen and hydrogen evolution reactions was performed by XPS and showed the presence of a Co-II/Co-III oxidation state.

10acobalt10aElectrochemistry10aheterogeneous catalysis10aHydrogen10awater splitting1 aShilpa, Nagaraju1 aNadeema, Ayasha1 aKurungot, Sreekumar uhttps://library.ncl.res.in/content/glycine-induced-electrodeposition-nanostructured-cobalt-hydroxide-bifunctional-catalyst01740nas a2200241 4500008004100000022001400041245008300055210006900138260000800207300001200215490000600227520098000233653001301213653002201226653001301248653001901261653001701280100001601297700002101313700002001334700003001354856011401384 2020 eng d a2367-198X00aCu-Ni bimetal integrated TiO2 thin film for enhanced solar hydrogen generation0 aCuNi bimetal integrated TiO2 thin film for enhanced solar hydrog cMAY a19005570 v43 a

A series of non-noble Cu-Ni bimetallic catalysts is prepared with different molar proportions of metals. Of these bimetallic catalysts, 1 wt% is subsequently integrated with titania P25. The catalysts are evaluated for solar hydrogen generation under 1 sun condition in both the powder and thin film forms. All the photocatalysts in the thin film exhibit an 8-24 times higher hydrogen yield (HY) compared with the corresponding particulate counterpart. The highest HY (41.7 mmol h(-1) g(-1)) is demonstrated for the photocatalyst Cu-Ni/TiO2 (CNT; 1:1 = Cu:Ni) in the thin film form, which is 24 times higher than that with its powder counterpart (1.75 mmol h(-1) g(-1)) and exceeds the performance of other Cu-Ni/TiO2 compositions. This enhanced activity in the thin film can be ascribed to improved absorption of visible light and an effective separation of photogenerated charge carriers at the interface of Cu-Ni/TiO2 leading to better charge carrier utilization.

10abimetals10aenergy conversion10aHydrogen10aPhotocatalysis10asolar energy1 aTudu, Bijoy1 aNalajala, Naresh1 aSaikia, Pranjal1 aGopinath, Chinnakonda, S. uhttps://library.ncl.res.in/content/cu-ni-bimetal-integrated-tio2-thin-film-enhanced-solar-hydrogen-generation01530nas a2200241 4500008004100000022001400041245007800055210006900133260000800202300001200210490000700222520076900229653003300998653001201031653002201043653001301065653001401078100001801092700002201110700002601132700002501158856010501183 2020 eng d a2155-543500aManganese-catalyzed alpha-olefination of nitriles with secondary alcohols0 aManganesecatalyzed alphaolefination of nitriles with secondary a cJAN a947-9540 v103 a

An expedient catalytic approach for alpha-olefination of nitriles using secondary alcohols with the liberation of molecular hydrogen and water as the only byproducts is reported. This reaction is catalyzed by a molecularly defined manganese(I) pincer complex and operates in the absence of any hydrogen acceptors. A broad range of substrates including cyclic, acyclic, and benzylic alcohols, as well as various nitrile derivatives, such as arylmethyl and heteroarylmethyl nitriles, are employed in the reaction to provide a diverse range of alpha-vinyl nitriles in good to excellent yields. Mechanistic studies showed that the reaction proceeds via dehydrogenative pathway and the activation of alpha(C-H) bond of the alcohol is the rate-determining step.

10aacceptorless dehydrogenation10aAlcohol10aalpha-olefination10aHydrogen10amanganese1 aYadav, Vinita1 aLandge, Vinod, G.1 aSubaramanian, Murugan1 aBalaraman, Ekambaram uhttps://library.ncl.res.in/content/manganese-catalyzed-alpha-olefination-nitriles-secondary-alcohols02522nas a2200265 4500008004100000022001400041245010300055210006900158260000900227300001600236490000600252520166000258653001501918653001301933653001601946653001701962653000901979653002001988100001602008700002102024700002902045700002002074700003002094856013202124 2021 eng d a2168-048500aRationally designed, efficient, and earth-abundant Ni-Fe cocatalysts for solar hydrogen generation0 aRationally designed efficient and earthabundant NiFe cocatalysts cOCT  a13915-139250 v93 aDeveloping highly efficient and affordable catalysts for solar hydrogen (H-2) generation is crucial, and employing a cocatalyst from earth-abundant elements has a critical role to play. In this context, different compositions of earth-abundant Ni-Fe alloy (1:1, 1:3, and 3:1) have been prepared by hydrothermal method; subsequently, 1 wt % of these Ni-Fe cocatalysts were integrated with TiO2-P25 and thoroughly characterized. The resultant catalysts have been evaluated for solar H-2 production, in powder and thin film forms, under one sun condition and in direct sunlight. Interestingly, all the catalysts in the thin film form exhibit superior hydrogen yield (HY), up to 27 times higher activity than its powder counterpart. Among the photocatalysts, Ni-Fe/TiO2 (3:1 = Ni/Fe; NFT31) composition exhibits the best HY in thin film (8.27 mmol.h(-1).g(-1)) and exceeds all other compositions of catalyst. It is also to be reported that HY measured for the powder form with 1 mg shows 3-17 times higher activity than that measured with 25 mg. This is mainly attributed to effective solar light absorption with a smaller amount of photocatalyst either spread over large area in a thin film form or well-dispersed in suspension forms. Furthermore, the enhanced activity obtained with Ni-Fe/TiO2 photocatalysts is also ascribed to strong electronic integration of Ni-Fe cocatalyst with TiO2 and higher performance obtained with a thin film is attributed to increased charge carrier generation and subsequent charge separation and effective utilization. A decrease in work function of TiO2 by 0.6 eV was observed after its integration with cocatalyst in NFT31.10aCocatalyst10aHydrogen10aNi-Fe alloy10asolar energy10aTiO210awater splitting1 aTudu, Bijoy1 aNalajala, Naresh1 aReddy, Kasala, Prabhakar1 aSaikia, Pranjal1 aGopinath, Chinnakonda, S. uhttps://library.ncl.res.in/content/rationally-designed-efficient-and-earth-abundant-ni-fe-cocatalysts-solar-hydrogen-generation02331nas a2200253 4500008004100000022001400041245014000055210006900195260000800264300001000272490000700282520143000289653001401719653001701733653002501750653001301775653002701788653001301815653003701828100002201865700002401887700003601911856013001947 2023 eng d a1615-684600aLow-temperature preferential CO oxidation in a hydrogen-rich stream over Pt-NaY and modified Pt-NaY catalysts for fuel cell application0 aLowtemperature preferential CO oxidation in a hydrogenrich strea cFEB a15-280 v233 a

Preferential oxidation of CO (CO-PROX) in the hydrogen-rich stream has been carried out over Pt-NaY catalysts containing various Pt loadings along with Fe, Co, and Au. Catalysts have been characterized with inductively coupled plasma-atomic emission spectroscopy, Brunauer, Emmett, and Teller surface area, X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, temperature programmed reduction, and Pt dispersion. CO-PROX activities and CO oxidation selectivities are observed to increase with an increase in Pt content. Pt-NaY catalyst with 0.75 wt.% Pt loading shows maximum CO-PROX activity at low temperatures. An increase in space velocity decreases the CO and O-2 conversions, but CO oxidation selectivity increases. A decrease in activity is observed when reformat gas contains around 20% H2O. During the stability test, no change in CO and O-2 conversions is observed, but a small increase in the CO oxidation selectivity is noticed after 10 h indicating that the Pt-NaY catalyst is a promising candidate for CO-PROX reaction in a hydrogen-rich stream. The Pt-Fe-NaY catalyst shows better activity than the Pt-NaY catalyst but starts deactivating after 10 h. However, activity is observed to decrease over Pt-Co-NaY and Pt-Au-NaY catalysts. Pt-Fe-NaY catalyst with 0.75 and 0.35 wt.% Pt and Fe, respectively, shows better CO-PROX activity at a temperature of 75 degrees C.

10acatalysis10aCO oxidation10aexperimental results10aflow bed10aFuel Cell Applications10aHydrogen10aX-ray photoelectron spectroscopy1 aMalwadkar, Sachin1 aBera, Parthasarathi1 aSatyanarayana, Chilukuri, V. V. uhttps://library.ncl.res.in/content/low-temperature-preferential-co-oxidation-hydrogen-rich-stream-over-pt-nay-and-modified-pt02167nas a2200265 4500008004100000022001400041245009100055210006900146260000900215300001200224490000800236520130800244653001501552653001901567653001301586653002701599653001501626100002401641700002001665700002801685700002201713700002101735700002601756856011901782 2024 eng d a1226-086X00aPerformance of Li exchange hierarchical X zeolite for CO2 adsorption and H2 separation0 aPerformance of Li exchange hierarchical X zeolite for CO2 adsorp cMAY  a505-5140 v1333 a

Li exchange hierarchical X zeolite (Li-H-X) was prepared by decationization of X zeolite by NH4Cl solution followed by Li exchange and subsequent calcination. NH4-X and Li-X were prepared to compare the results of LiH-X. XRD, FE-SEM, EDS, N2 adsorption-desorption, and micro-/mesoporous volume were performed. The higher mesoporosity was confirmed in Li-H-X due to the framework dealumination during decationization. Static and dynamic sorption capacity of sorbents was evaluated to identify the performance of sorbent. The CO2 and H2 equilibrium adsorption capacity of Li-H-X was found to be 9.6 mmol g-1 and 0.78 mmol g-1, respectively, at 298 K and 20 bar, which was 25 % (CO2) and 30 % (H2) higher than Li-X. Static experimental data were validated using the Langmuir, Freundlich, and Sips models. The CO2 & H2 dynamic sorption capacity of Li-H-X sorbent for binary gas (CO2/H2, 25/75 %) was 4.145 mmol g-1 and 0.258 mmol g-1 at 303 K and 10 bar. The higher sorption capacity of Li-H-X was obtained due to large micro-/mesoporous volume of sorbent, which may allow to access unoccupied sites at higher pressure. This result reveals that micro-/mesoporous structure of zeolite adsorbs significantly higher CO2 from binary gas stream, which can use to separate pure H2 from gas stream.

10aAdsorption10aCarbon dioxide10aHydrogen10aMicroporous-mesoporous10aSeparation1 aShrotri, Aadesh, R.1 aBirje, Amit, R.1 aNiphadkar, Prashant, S.1 aBokade, Vijay, V.1 aMali, Nilesh, A.1 aNandanwar, Sachin, U. uhttps://library.ncl.res.in/content/performance-li-exchange-hierarchical-x-zeolite-co2-adsorption-and-h2-separation01050nas a2200337 4500008004100000022001400041245010800055210006900163260000800232300001600240490000700256653001200263653001900275653001500294653001100309653001300320653001200333100001600345700002200361700002200383700001800405700002100423700001800444700002300462700002100485700001800506700001900524700002500543700001700568856012700585 2024 eng d a1944-824400aPurification of waste-generated biogas mixtures using covalent organic framework's high CO2 Selectivity0 aPurification of wastegenerated biogas mixtures using covalent or cAPR a22066-220780 v1610aCAPTURE10aCARBON-DIOXIDE10aEfficiency10aEnergy10aHydrogen10aSTORAGE1 aPaul, Ratul1 aMaibam, Ashakiran1 aChatterjee, Rupak1 aWang, Wenjing1 aMukherjee, Triya1 aDas, Nitumani1 aYellappa, Masapogu1 aBanerjee, Tanmay1 aBhaumik, Asim1 aMohan, Venkata1 aBabaRao, Ravichandar1 aMondal, John uhttps://library.ncl.res.in/content/purification-waste-generated-biogas-mixtures-using-covalent-organic-frameworks-high-co2