01482nas a2200265 4500008004100000022001400041245011200055210006900167260007300236300001000309490000800319520051300327653002400840653002800864653002100892653002300913653002800936653002100964653002600985100001901011700002001030700001701050700001801067856013101085 2005 eng d a0926-860X00aRole of a co-metal in bimetallic Ni-Pt catalyst for hydrogenation of m-dinitrobenzene to m-phenylenediamine0 aRole of a cometal in bimetallic NiPt catalyst for hydrogenation  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcOCT a23-300 v2953 a

Bimetallic Ni-Pt catalysts supported on carbon were found to give very high turn over frequency numbers and almost complete selectivity to m-phenylenediamine in m-dinitrobenzene hydrogenation as compared to the monometallic nickel catalysts. The XRD and XPS characterization revealed that most of the nickel remains as Ni2+ in a monometallic catalyst while, the addition of platinum leads to the stabilization of Ni-0 state, in case of bimetallic catalysts. (c) 2005 Elsevier B.V. All rights reserved.

10aBimetallic catalyst10aCatalytic hydrogenation10am-dinitrobenzene10am-phenylenediamine10aSelective hydrogenation10aturn over number10aXPS and XRD of nickel1 aTelkar, M., M.1 aNadgeri, J., M.1 aRode, C., V.1 aChaudhari, R. uhttps://library.ncl.res.in/content/role-co-metal-bimetallic-ni-pt-catalyst-hydrogenation-m-dinitrobenzene-m-phenylenediamine-001944nas a2200217 4500008004100000022001400041245011800055210006900173260009900242300001000341490000800351520108300359653002301442653002401465653001801489653002001507653002001527100002101547700002901568856012901597 2015 eng d a0960-852400aEfficient method for the conversion of agricultural waste into sugar alcohols over supported bimetallic catalysts0 aEfficient method for the conversion of agricultural waste into s aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLANDbELSEVIER SCI LTDcFEB a36-440 v1783 a

Promoter effect of Sn in the PtSn/gamma-Al2O3 (AL) and PtSn/C bimetallic catalysts is studied for the conversion of variety of substrates such as, C5 sugars (xylose, arabinose), C6 sugars (glucose, fructose, galactose), hemicelluloses (xylan, arabinogalactan), inulin and agricultural wastes (bagasse, rice husk, wheat straw) into sugar alcohols (sorbitol, mannitol, xylitol, arabitol, galactitol). In all the reactions, PtSn/AL showed enhanced yields of sugar alcohols by 1.5-3 times than Pt/AL. Compared to C, AL supported bimetallic catalysts showed prominent enhancement in the yields of sugar alcohols. Bimetallic catalysts characterized by X-ray diffraction study revealed the stability of catalyst and absence of alloy formation thereby indicating that Pt and Sn are present as individual particles in PtSn/AL. The TEM analysis also confirmed stability of the catalysts and XPS study disclosed formation of electron deficient Sn species which helps in polarizing carbonyl bond to achieve enhanced hydrogenation activity. (C) 2014 Elsevier Ltd. All rights reserved.

10aAgricultural waste10aBimetallic catalyst10aHydrogenation10aMonosaccharides10aPolysaccharides1 aTathod, Anup, P.1 aDhepe, Paresh, Laxmikant uhttps://library.ncl.res.in/content/efficient-method-conversion-agricultural-waste-sugar-alcohols-over-supported-bimetallic-001712nas a2200217 4500008004100000245009600041210006900137260000800206300001200214490000700226520099500233653001801228653002401246653002001270653001301290653002301303653001801326100001701344700001801361856011501379 2018 eng d00aOne pot conversion of furfural to 2-methylfuran in the presence of PtCo bimetallic catalyst0 aOne pot conversion of furfural to 2methylfuran in the presence o cMAY a703-7130 v203 a

Biomass-derived furfural (FAL) is the platform chemical for synthesis of various value-added chemicals and fuels. One of the FAL-derived chemicals, i.e., 2-methylfuran (2-MF), is the potential biofuel due to its attractive chemical and physical properties. Various methods are reported for conversion of FAL to 2-MF which are operated at high temperature and high H2 pressure. In present work, one pot catalytic method was developed in batch mode process for conversion of FAL to 2-MF. Reactions are carried out in the presence of PtCo/C bimetallic catalyst under 0.5–1 MPa H2 pressure. Monometallic and bimetallic catalysts with different Pt and Co loading were prepared by wet impregnation method, and catalysts were characterized by transmission electron microscopy, BET surface area, X-ray photoelectron spectroscopy, X-ray diffraction and inductive coupled plasma atomic emission spectroscopy techniques. 59% 2-MF yield was achieved at 180 °C and lower (0.5 MPa) H2 pressure.

10a2-Methylfuran10aBimetallic catalyst10aCo-impregnation10afurfural10aHydrodeoxygenation10aHydrogenation1 aDohade, M.G.1 aDhepe, P., L. uhttps://library.ncl.res.in/content/one-pot-conversion-furfural-2-methylfuran-presence-ptco-bimetallic-catalyst01999nas a2200229 4500008004100000022001400041245008400055210006900139260000800208300000800216490000600224520124700230653002401477653001301501653001801514653001701532100002801549700002301577700003301600700002401633856011201657 2018 eng d a2073-434400aTi-doped Pd-Au catalysts for one-pot hydrogenation and ring opening of furfural0 aTidoped PdAu catalysts for onepot hydrogenation and ring opening cJUN a2520 v83 a

Pd-Au bimetallic catalysts with different Pd/Au atomic ratios, supported on ordered structured silica (Hexagonal mesoporous silica-HMS, or Santa Barbara Amorphous-15-SBA-15) were evaluated for one-pot hydrogenation of furfural to 1,2-pentanediol. The surface and structural properties of the catalysts were deeply investigated by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), N-2 adsorption isotherms (BET), Infrared spectroscopy (IR), and acid capacity measurements. XPS studies revealed that Ti doped supports had higher dispersion of the active phase, particularly in the case of Pd-Au materials in which Ti played an important role in stabilizing the metallic species. Among the various process conditions studied, such as temperature (160 degrees C), catalyst amount (10% w/w), and reaction time (5 h), H-2 pressure (500 psi) was found to improve the 1,2-pentanediol selectivity. The SBA silica bimetallic Ti-doped system showed the best performance in terms of stability and reusability, after multiple cycles. Under specific reaction conditions, the synergism between Pd-Au alloy and Ti doping of the support allowed the ring opening pathway towards the formation of 1,2-pentanediol in furfural hydrogenation.

10aBimetallic catalyst10afurfural10aHydrogenation10aring-opening1 aDate, Nandan, Shreehari1 aLa Parola, Valeria1 aRode, Chandrashekhar, Vasant1 aTesta, Maria, Luisa uhttps://library.ncl.res.in/content/ti-doped-pd-au-catalysts-one-pot-hydrogenation-and-ring-opening-furfural01473nas a2200229 4500008004100000022001400041245007100055210006900126260000800195300001000203490000800213520074300221653002400964653001200988653003301000653001701033653001701050653003201067100002201099700002101121856010101142 2019 eng d a1566-736700aHighly efficient Pt-MoOx/ZrO2 catalyst for green diesel production0 aHighly efficient PtMoOxZrO2 catalyst for green diesel production cMAY a70-760 v1253 a

Bimetallic Pt-MoOx supported on ZrO2 exhibits higher catalytic activity than known catalysts for converting fatty acids into green diesel at as low as 200 degrees C. A change in selectivity from decarboxylation/decarbonylation to hydrodeoxygenation and enhancement in the deoxygenation activity of Pt were observed when MoOx was also present in the catalyst composition. In X-ray photoelectron spectra, Pt 4f lines of 4Pt-8MoO(x)/ZrO2 occurred at lower binding energies than those for 4Pt/ZrO2. Part of Mo was reduced from +6 to +5 oxidation state in the presence of Pt. There seems to exist some electronic interaction between the support and metal, making 4Pt-8MoO(x)/ZrO2 a highly efficient and selective deoxygenation catalyst.

10aBimetallic catalyst10aBiofuel10aDeoxygenation of fatty acids10aGreen Diesel10aHydrocarbons10aSupported platinum catalyst1 aJanampelli, Sagar1 aDarbha, Srinivas uhttps://library.ncl.res.in/content/highly-efficient-pt-mooxzro2-catalyst-green-diesel-production02423nas a2200253 4500008004100000022001400041245011300055210006900168260000900237300001400246490000600260520155200266653002801818653002401846653001301870653001801883653002301901100002101924700002101945700001901966700002401985700002902009856013102038 2020 eng d a2365-654900aOne pot hydrogenation of furfural to 2-methyl tetrahydrofuran over supported mono- and Bi-metallic catalysts0 aOne pot hydrogenation of furfural to 2methyl tetrahydrofuran ove cAUG  a9590-96000 v53 a

2-Methyltetrahydrofuran is a valuable commercial product that can be obtained by direct hydrogenation of furfural. In the present study, among several carbon supported bimetallic Ir-Ni catalysts with different loadings screened, 4% Ir-4% Ni/C catalyst showed excellent activity in terms of direct conversion (99%) to 2-MeTHF with a maximum selectivity of similar to 74% at 220 degrees C and 750 psig, suppressing the formation of side chain as well as ring opening products. The catalytic activity was found to be mainly affected by catalyst preparation methods, metal loadings, surface composition, temperature, pressure and catalyst loading. HR-TEM and STEM revealed well dispersed Ir-Ni NPs having the particle sizes in the range of 2 to 5 nm. Different phases of Ir i. e. Ir degrees and IrO(2)as well as oxygen vacancies were found to be responsible for hydrogenation of furfural to 2-methyl furan while, Ni degrees and NiO were responsible for further hydrogenation to 2-MeTHF. The synergic effect between Ir and Ni was established through XPS, H-2-TPR analysis. With the help of some control experiments, the plausible reaction pathway was also proposed. The catalyst prepared by co-impregnation method found more effective than prepared by sequential addition method. At lower Ni loadings of 1% and 2%, low temperature of 160 degrees C as well as at low H(2)pressure of 250 psig, mixture of furfuryl alcohol and 2-methyl furan were formed selectively. Catalyst could be successfully reused up to 3 times without leaching of metals.

10a2-Methyltetrahydrofuran10aBimetallic catalyst10afurfural10aHydrogenation10aOER type mechanism1 aDate, Nandan, S.1 aHengne, Amol, M.1 aHuang, K., -W.1 aChikate, Rajeev, C.1 aRode, Chandrashekhar, V. uhttps://library.ncl.res.in/content/one-pot-hydrogenation-furfural-2-methyl-tetrahydrofuran-over-supported-mono-and-bi-metallic11157nas a2200217 45000080041000000220014000412450135000552100069001902600008002593000011002674900008002785201038200286653002410668653001810692653001810710653001010728653001910738100002110757700002210778856013910800 2021 eng d a0008-621500aElucidating the effect of solid base on the hydrogenation of C5 and C6 sugars over Pt–Sn bimetallic catalyst at room temperature0 aElucidating the effect of solid base on the hydrogenation of C5  cJUL a1083410 v5053 a

Conversion of sugars into sugar alcohols at room temperature with exceedingly high yields are achieved over Pt–Sn/γ-Al2O3 catalyst in the presence of calcined hydrotalcite. pH of the reaction mixture significantly affects the conversion and selectivity for sugar alcohols. Selection of a suitable base is the key to achieve optimum yields. Various solid bases in combination with Pt–Sn/γ-Al2O3 catalysts were evaluated for hydrogenation of sugars. Amongst all combinations, the mixture (1:1 wt/wt) of Pt–Sn/γ-Al2O3 and calcined hydrotalcite showed the best results. Hydrotalcite helps to make the pH of reaction mixture alkaline at which sugar molecules undergo ring opening. The sugar molecule in open chain form has carbonyl group which can be polarized by Sn in Pt–Sn/γ-Al2O3 and Pt facilitates the hydrogenation. In the current work, effect of both; solid base and Sn as a promoter has been studied to improve the yields of sugar alcohols from various C5 and C6 sugars at very mild reaction conditions.

10aBimetallic catalyst10aHydrogenation10aHydrotalcites10aSugar10aSugar alcohols1 aTathod, Anup, P.1 aDhepe, Paresh, L. uhttps://library.ncl.res.in/content/elucidating-effect-solid-base-hydrogenation-c5-and-c6-sugars-over-pt%E2%80%93sn-bimetallic-catalyst02307nas a2200337 4500008004100000022001400041245015300055210006900208260000900277300001100286490000800297520117300305653002001478653002401498653002201522653000901544653002301553653001201576653002501588653004301613100002401656700001801680700001901698700002001717700002501737700001701762700001801779700002501797700001801822856012901840 2025 eng d a1385-894700aExploring the electronic modulation in controlling the activity and selectivity of Ni-Au-In based catalyst in atmospheric pressure CO2 hydrogenation0 aExploring the electronic modulation in controlling the activity  cSEP  a1659210 v5203 a

Nickel-based catalysts are widely used for the hydrogenation of CO2 but encounter stability challenges during prolonged reactions and at elevated temperatures. At atmospheric pressure, nickel primarily promotes methane formation in CO2 hydrogenation reactions. In this work, we demonstrate that the stability and activity of nickel can be significantly enhanced through gold (Au) modification. Furthermore, we achieve a near-complete selectivity switch from methane to CO by incorporating indium (In), mediated through the formation of Au-In alloy. This catalyst exhibits excellent CO2 conversion and CO selectivity at relatively lower temperatures (400 degrees C), addressing a major bottleneck in the Reverse Water-Gas Shifts (RWGS) reaction. XPS studies demonstrate an interesting electron transfer mechanism facilitated by gold, which involves the formation of electronrich Au species (Au delta-) and the development of Au-In alloys. This process improves the reducibility of nickel oxide while allowing a fraction of nickel to remain in its metallic form, managing a facile hydrogenation process and regulating the shift in selectivity from CH4 to CO.

10aAlloy formation10aBimetallic catalyst10aCO2 hydrogenation10aRWGS10aSelectivity switch10asynergy10aTrimetallic catalyst10aXPS (X-ray photoelectron spectroscopy)1 aBajpai, Jyotsna, P.1 aGupta, Sharad1 aGoud, Devender1 aDeka, Diku, Raj1 aJagtap, Anuradha, V.1 aKumar, Pawan1 aAhamed, Momin1 aPeter, Sebastian, C.1 aVinod, C., P. uhttps://library.ncl.res.in/content/exploring-electronic-modulation-controlling-activity-and-selectivity-ni-au-based-catalyst02243nas a2200313 4500008004100000022001400041245015900055210006900214260000800283300001100291490000800302520113800310653002401448653001901472653002301491653002001514653002001534653003501554653002301589100002801612700002601640700002201666700002901688700001801717700002301735700002201758700001801780856013101798 2025 eng d a1385-894700aUnravelling the Cu-Co nanoparticle synergy over Ceria-Zirconia support toward efficient reverse water gas shift (RWGS) conversion under H2 lean conditions0 aUnravelling the CuCo nanoparticle synergy over CeriaZirconia sup cMAR a1607050 v5083 a

CO2 emissions leading to global warming and environmental and socio-economic issues have propelled the research community to develop technologies capable of capturing and converting CO2 into valuable products. Controlling the selectivity toward platform molecules like CO, methanol, or methane is a fundamental challenge in CO2 hydrogenation. Supported cobalt nanoparticles are known for hydrocarbon production through FischerTropsch (FT) reaction, and Cu-based catalysts are known for reverse water gas shift (RWGS) reaction. Here, we show that d-band centre can be carefully modulated by making bimetallic combinations of Cu and Co for a highly active RWGS catalyst. An oxygen vacancy-rich nanostructured ceria-zirconia (CZ) support with Cu nanoparticles (2 wt%) modified with as low as 0.05 wt% Co shows excellent conversion for CO2 hydrogenation and selectivity for CO below 500 degrees C. The optimized catalyst shows CO2 conversion even under hydrogen lean conditions (H2/ CO2 ratio 0.5:1), with a breakthrough rate of 206023 mmol/gmetal/h for CO at 600 degrees C, having H2 utilization of 80% for the RWGS process.

10aBimetallic catalyst10aCeria-zirconia10aCO 2 hydrogenation10aCobalt catalyst10aCopper catalyst10aReverse water gas shift (RWGS)10asynergistic effect1 aJagtap, Anuradha, Vijay1 aBamnia, Mahesh, Kumar1 aMaibam, Ashakiran1 aBajpai, Jyotsna, Paliwal1 aGupta, Sharad1 aThomas, Sharon, K.1 aDabke, Niteen, B.1 aVinod, C., P. uhttps://library.ncl.res.in/content/unravelling-cu-co-nanoparticle-synergy-over-ceria-zirconia-support-toward-efficient-reverse