01985nas a2200253 4500008004100000022001400041245010300055210006900158260007700227300001400304490000600318520106600324653002001390653000901410653002801419653001401447653001001461100002601471700002901497700002601526700002601552700003001578856012301608 2014 eng d a1867-388000aRole of nanointerfaces in Cu- and Cu plus Au-based near-ambient-temperature CO oxidation catalysts0 aRole of nanointerfaces in Cu and Cu plus Aubased nearambienttemp aBOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcNOV a3116-31240 v63 a

Disordered mesoporous Cu-doped ceria-zirconia (Cu0.1Ce0.85Zr0.05O2), and gold deposited (Au/Cu0.1Ce0.85Zr0.05O2) catalysts were synthesized and evaluated for CO oxidation. Onset of CO oxidation activity, and 50% (100%) CO2 formation occurs at room temperature (RT), and 77 (120)degrees C, respectively, with Cu0.1Ce0.85Zr0.05O2. A small amount of gold on Cu0.1Ce0.85Zr0.05O2 induces the sustainable oxidation catalysis around RT. Onset of copper reduction temperature decreases from 110 degrees C on Cu0.1Ce0.85Zr0.05O2 to 48 degrees C with Au/Cu0.1Ce0.85Zr0.05O2, highlighting the direct interaction between Cu and Au through a Cu-Au interface. Au particles with a (00 1) facet deposit on an oxygen-deficient site of (111) facet of CeO2-ZrO2. Any decrease in surface Cu-content with increasing Au-content further supports the Au-Cu-Ce/Zr interface interactions. Nanointerfaces of Au clusters on Cu next to oxygen-deficient sites of CeO2-ZrO2 facilitate all the elementary steps of the CO + O-2 reaction to occur in close proximity at ambient conditions.

10acarbon monoxide10aGold10aheterogeneous catalysis10aOxidation10aredox1 aGnanakumar, Edwin, S.1 aNaik, Jarpla, Madhusudha1 aManikandan, Marimuthu1 aRaja, Thirumalaiswamy1 aGopinath, Chinnakonda, S. uhttps://library.ncl.res.in/content/role-nanointerfaces-cu-and-cu-plus-au-based-near-ambient-temperature-co-oxidation-001909nas a2200217 4500008004100000022001400041245009800055210006900153260011000222300001400332490000600346520103900352100002701391700002901418700002801447700002601475700001901501700002101520700002601541856012401567 2015 eng d a2046-206900aEfficient robust fluorite CeZrO4-delta oxide catalyst for the eco-benign synthesis of styrene0 aEfficient robust fluorite CeZrO4delta oxide catalyst for the eco aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcDEC a3619-36260 v53 a

In this work, we have reported CeO2, ZrO2, physically mixed (PH)-CeO2/ZrO2 and fluorite CeZrO4-delta oxides and their catalytic activities for the oxidative dehydrogenation (ODH) of ethyl benzene (EB) to styrene (ST) using molecular oxygen, air and carbon dioxide as oxidants. The catalysts were prepared by a gel-combustion method followed by calcination at 600 degrees C for 6 h and subjected to catalytic activity measurements. All the catalysts were characterized and studied by various physicochemical methods. The reaction parameters were varied systematically such as different catalysts, oxidants, temperatures, EB flow and oxidant flow. CeZrO4-delta accounted for a 47% styrene yield for 72 h without any significant deactivation under optimized reaction conditions. A thorough analysis of the spent catalysts demonstrated the robustness of the catalyst for this reaction under different oxidants and reaction conditions. Pristine CeO2 deactivated easily and the activity decreased with time on stream of the reaction.

1 aPeriyasamy, Kaliyappan1 aAswathy, Venugopalan, T.1 aKumar, Venugopal, Ashok1 aManikandan, Marimuthu1 aShukla, Rakesh1 aTyagi, Avesh, K.1 aRaja, Thirumalaiswamy uhttps://library.ncl.res.in/content/efficient-robust-fluorite-cezro4-delta-oxide-catalyst-eco-benign-synthesis-styrene-002110nas a2200205 4500008004100000022001400041245013600055210006900191260011000260300001400370490000600384520122800390100002201618700002801640700001901668700002601687700002601713700003301739856013201772 2015 eng d a2044-475300aRenewable fuels from biomass-derived compounds: Ru-containing hydrotalcites as catalysts for conversion of HMF to 2,5-dimethylfuran0 aRenewable fuels from biomassderived compounds Rucontaining hydro aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcMAR a1463-14720 v53 a

Production of transportation fuels from renewable biomass is hugely important considering the current ecological concerns over CO2 built up in the atmosphere. Ruthenium-containing hydrotalcite (HT) catalysts were applied for the selective hydrogenolysis of biomass-derived 5-hydroxymethylfurfural (HMF) to 2,5-dimethylfuran (DMF). Structural and morphological features of the catalysts were examined using various physico-chemical characterization techniques. The influence of various reaction parameters, such as reaction temperature, solvent, Ru content of the catalyst, etc., was investigated with respect to HMF conversion and DMF yield. The study clearly shows that well-dispersed Ru nanoparticles are highly active and selective in the conversion of HMF to DMF. A catalyst containing only 0.56 wt% Ru converted 100 mol% HMF to yield 58 mol% DMF. This catalyst was found to be recyclable as the activity was retained even after five cycles of reaction. 2-Propanol was found to be a good solvent as it helped to improve DMF yield through transfer hydrogenation. Based on the results of the investigations, a reaction pathway for the conversion of HMF to DMF was proposed for the present Ru-based catalyst system.

1 aNagpure, Atul, S.1 aVenugopal, Ashok, Kumar1 aLucas, Nishita1 aManikandan, Marimuthu1 aThirumalaiswamy, Raja1 aChilukuri, Satyanarayana, V. uhttps://library.ncl.res.in/content/renewable-fuels-biomass-derived-compounds-ru-containing-hydrotalcites-catalysts-conversion-002718nas a2200193 4500008004100000022001400041245012000055210006900175260011000244300001400354490000600368520188700374100002602261700002802287700002202315700003302337700002602370856012802396 2016 eng d a2046-206900aPromotional effect of Fe on the performance of supported Cu catalyst for ambient pressure hydrogenation of furfural0 aPromotional effect of Fe on the performance of supported Cu cata aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcDEC a3888-38980 v63 a

A noble-metal free FeCu based bimetallic catalyst system prepared by facile co-impregnation method was found to be highly admirable for vapour phase selective hydrogenation of furfural to furfuryl alcohol at ambient pressure. Monometallic Cu/gamma-Al2O3, Fe/gamma-Al2O3 and bimetallic FeCu/gamma-Al2O3 catalysts with different Fe loadings were prepared. Structural and morphological features of the catalysts were thoroughly investigated by several physico-chemical characterization techniques. The influence of various reaction parameters, such as Fe loading, reaction temperature and flow of reactants was examined with respect to furfural conversion and furfuryl alcohol yield. The results clearly showed that an optimum amount of Fe is necessary to enhance the catalytic activity of monometallic Cu/gamma-Al2O3 for the selective hydrogenation of furfural. The catalyst FC-10 with 10 wt% Fe exhibited excellent activity which led to high furfural conversion (>93%) and furfuryl alcohol selectivity (>98%) under mild reaction conditions. The higher activity of bimetallic FeCu/gamma-Al2O3 compared to monometallic Cu/gamma-Al2O3 is ascribed to the formation of FeCu bimetallic particles and the existence of oxygen vacancies in the Fe oxide system. The superior activity after Fe loading on the Cu-based catalyst was attributed to the synergy between Cu and Fe. A plausible mechanism is proposed to explain the promoting effect of Fe, which involves synergism between Fe sites with strong oxophilic nature and Cu sites with a high ability for hydrogen activation. Based on the activity results, prolonged catalytic activity and spent catalyst analysis, the developed FeCu/gamma-Al2O3 catalyst is inexpensive, eco-benign and robust, which makes it a promising candidate for the efficient conversion of biomass-derived substrates to fine chemicals and drop-in biofuels.

1 aManikandan, Marimuthu1 aVenugopal, Ashok, Kumar1 aNagpure, Atul, S.1 aChilukuri, Satyanarayana, V.1 aRaja, Thirumalaiswamy uhttps://library.ncl.res.in/content/promotional-effect-fe-performance-supported-cu-catalyst-ambient-pressure-hydrogenation-002331nas a2200229 4500008004100000022001400041245013900055210006900194260007300263300001200336490000800348520140400356653003601760653003101796653001801827100002601845700002801871700002101899700002401920700002601944856013101970 2016 eng d a1381-116900aRole of surface synergistic effect on the performance of Ni-based hydrotalcite catalyst for highly efficient hydrogenation of furfural0 aRole of surface synergistic effect on the performance of Nibased aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJUN a153-1620 v4173 a

The selective vapor phase hydrogenation of furfural at ambient pressure has been investigated using a facile and robust hydrotalcite derived Ni containing mixed oxide catalyst. The systematic characterization results conferred that the difficulty in the reduction of Ni species due to the strong interaction between Ni and support, which facilitated from the homogeneous distribution of hydrotalcite structure. It was also found that the structure and catalytic performance of the catalysts were greatly influenced by Ni loading. Through fine-tuned surface elemental sites and reaction conditions, furfural conversion of 98% with 95% of furfuryl alcohol selectivity was achieved over a MAN-2 catalyst containing two molar ratio of Ni. The results have demonstrated that the incorporation of Mg significantly enhances the Ni-support interaction, Ni dispersion and catalytic performance. The high efficiency of the Ni-based hydrotalcite derived catalyst was mainly attributed to the surface synergistic interaction between the catalytically active metallic Ni sites and the strong basic sites, which furnished an eco-benign and sustainable catalyst for the selective hydrogenation of furfural. Furthermore, the spent catalyst analysis substantiated that no significant difference in the catalyst phase was observed even after 48 h of reaction stream. (C) 2016 Elsevier B.V. All rights reserved.

10aalcohol-hydrotalcites-selective10aBiomass-frurfural-furfuryl10aHydrogenation1 aManikandan, Marimuthu1 aVenugopal, Ashok, Kumar1 aPrabu, Kandasamy1 aJha, Ratnesh, Kumar1 aThirumalaiswamy, Raja uhttps://library.ncl.res.in/content/role-surface-synergistic-effect-performance-ni-based-hydrotalcite-catalyst-highly-efficient02019nas a2200193 4500008004100000022001400041245012500055210006900180260000800249300001000257490000800267520129700275100002601572700002101598700002401619700002601643700003201669856012401701 2018 eng d a2468-823100aTuning the basicity of Cu-based mixed oxide catalysts towards the efficient conversion of glycerol to glycerol carbonate0 aTuning the basicity of Cubased mixed oxide catalysts towards the cDEC a53-620 v4603 aA series of efficient and robust Cu based mixed oxides were synthesized by a simple co-precipitation method and utilized for the production of glycerol carbonate (GC) via transesterification of glycerol with dimethyl carbonate (DMC). The synthesized materials were characterized using XRD, UV-vis spectroscopy, SEM, TEM, N-2 sorption, CO2-TPD, and XPS. The addition of Cu on Mg/Al mixed oxides exhibits significant changes in its physicochemical properties and catalytic activity. The obtained mixed oxides showed remarkably high transesterification activity towards the efficient conversion of glycerol to GC under economical reaction conditions without using any solvent. Among all the catalysts employed, highest catalytic activity was observed over MAC-0.6 catalyst with glycerol conversion of 96.4% and GC yield of 91.2%. The improved catalytic performance was observed mainly due to the optimized catalyst molar ratio and strong surface basicity. The strong surface basic sites were greatly attributed to the incorporation of Cu2+ cations in the MgAl (O) periclase that efficiently catalyzed the transesterification of glycerol with DMC. Furthermore, the reported catalyst was robust and could be recycled for more than five times without any significant loss in its catalytic activity.1 aManikandan, Marimuthu1 aPrabu, Marimuthu1 aKumar, S., K. Ashok1 aSangeetha, Palanivelu1 aVijayaraghavan, Rajagopalan uhttps://library.ncl.res.in/content/tuning-basicity-cu-based-mixed-oxide-catalysts-towards-efficient-conversion-glycerol04507nas a2200193 4500008004100000245009100041210006900132260000800201300001400209490000600223520382900229100002104058700002604079700002104105700002204126700002504148700002604173856011404199 2019 eng d00a Synthesis of biodiesel using the Mg/Al/Zn hydrotalcite/SBA-15 nanocomposite catalyst 0 aSynthesis of biodiesel using the MgAlZn hydrotalciteSBA15 nanoco cFEB a3500-35070 v43 a

Biodiesel production is an enchanting and eccentric pathway for the reduction of use of fossil fuels and is procured from biologically available renewable sources such as oils and fats. A novel Mg/Al/Zn-based hydrotalcite/SBA-15 composite material having a high catalytic activity was developed and investigated for the transesterification of vegetable oil. The rationally developed composites were systematically characterized and assessed in the transesterification of soybean oil in the presence of methanol. The physicochemical evaluation of the nanocomposites demonstrated the influence of Zn in the textural characteristics, density of the basic sites, and successively the catalytic activity. The catalytic efficiency of the MAZ-x/SBA-15 composite could be linked with the basic site density determined by the temperature-programmed desorption of CO2. Among all the composites used, the MAZ-1/SBA-15 nanocomposite showed the highest activity for biodiesels, with a yield of around 90% under economical reaction conditions. The catalytic studies conferred that the fatty acid methyl ester yield is significantly influenced by various experimental conditions such as the catalyst molar ratio, reaction temperature, pressure, and contact time. It was also found that the incorporation of hydrotalcite into SBA-15 pore channels can enhance the catalyst efficiency and stability of the nanocomposite. Moreover, under mild reaction conditions, a remarkably stable catalytic performance was achieved for more than 200 h of time on stream with no catalyst deactivation.
 

1 aPrabu, Marimuthu1 aManikandan, Marimuthu1 aKandasamy, Prabu1 aKalaivani, P., R.1 aRajendiran, Nagappan1 aRaja, Thirumalaiswamy uhttps://library.ncl.res.in/content/synthesis-biodiesel-using-mgalzn-hydrotalcitesba-15-nanocomposite-catalyst02491nas a2200253 4500008004100000022001400041245014200055210006900197260000800266300001100274490000800285520163000293653001501923653001201938653001701950653001801967653001101985100002601996700002202022700002102044700002602065700002602091856012002117 2022 eng d a0921-510700aComparative investigation on the catalytic performance of HT/SBA-15 and SBA-15/HT composites for the isomerization of glucose to fructose0 aComparative investigation on the catalytic performance of HTSBA1 cDEC a1160520 v2863 a

Hydrotalcites (HT) have a broad spectrum of applications as prosperous heterogeneous catalysts for diverse chemical transformations. The catalytic activity of HT-based materials can be tailored by introducing siliceous material into the internal or external framework. The surface modification of the HT framework with silica mesostructures leads to the formation of versatile Lewis base, Bronsted base and redox catalytic active sites. This work presents the comparative evaluation of the catalytic performance of HT/SBA-15 and SBA-15/HT composites for the isomerization of glucose to fructose using 1-butanol as a solvent. The composites with different external morphology were prepared by a modified template-assisted hydrothermal method, using different HT to SBA-15 proportions. The textural and morphological characterization results conferred the efficiency of the employed post-synthetic intercalation strategy to achieve the successful formation of HT/SBA-15 and SBA-15/HT composites. With optimal HT loading and surface basicity, the HTS-3 composite demonstrated the highest catalytic performance, resulting in good glucose conversions (54 %) with improved selectivity (>83 %). The observed high reactivity could be mainly attributed to the extensive dispersion of HT particles on the SBA-15 component, which contributes to a significant increase in textural properties and surface basicity. Furthermore, special attention is devoted to addressing such reactivity phenomena as active site selectivity, catalyst multifunctionality and multisite reactivity commonly encountered in mesoporous catalysis.

10acomposites10aglucose10ahydrotalcite10aisomerization10aSBA-151 aManikandan, Marimuthu1 aArjunan, Ayyappan1 aPrabu, Marimuthu1 aRaja, Thirumalaiswamy1 aSangeetha, Palanivelu uhttps://library.ncl.res.in/content/comparative-investigation-catalytic-performance-htsba-15-and-sba-15ht-composites02480nas a2200325 4500008004100000245010800041210006900149260000800218300001400226490000600240520139800246653001601644653002401660653002601684653002301710653001501733653001701748100002101765700002601786700002901812700002901841700002501870700002601895700002101921700002201942700001601964700002601980700002602006856012202032 2023 eng d00aMnXWO4 nanostructure-based catalysts for single-step oxidation of cyclohexane and methane to oxygenates0 aMnXWO4 nanostructurebased catalysts for singlestep oxidation of  cAPR a7245-72580 v63 a

Activation of the C-H bond in cyclohexane (CYH) and methane is a crucial step to obtain desirable oxygenated products using nanostructured catalyst and is a great challenge and an efficient route to mitigate the inauspicious effects of climate change. The active sites were identified using XRD, HR-TEM, SEM, N2 sorption analysis, TPR, Raman, XPS, TGA, in situ DRIFT, XAS, etc. In optimal reaction conditions, 46% of CYH was converted into adipic acid (AA) on MnxWO4 nanostructures within 6 h. The recyclability test confirmed the catalyst heterogeneity, which revealed no appreciable loss of catalytic activity even after three consecutive reactions. In situ DRIFT study reveals that CYH is oxidized to cyclohexanone and cyclohexanol (KA oil) and is further oxidized to AA via carboxylate intermediates. DFT studies disclosed that MnOx species are responsible for the C-H activation of CYH, and the Mn2+/Mn3+ redox centers play a vital role in the absorption of KA oil to form AA. Herein, we demonstrated the significant role of the ``MnOx'' species and that adequate Lewis and Bronsted acidic sites, redox centers of (Mn2+/Mn3+), and lattice oxygen are accountable for the CYH conversion toward the AA. Additionally, we have reported the oxidation of methane to methanol (146 mu mole per gram of catalyst) in the presence of water at 75 degrees C without over-oxidation products.

10aAdipic Acid10aC-H bond activation10aCyclohexane oxidation10amethane activation10aMnOx chain10aRedox center1 aPrabu, Marimuthu1 aManikandan, Marimuthu1 aSamal, Pragnya, Paramita1 aGurrala, Lakshmi, Prasad1 aMekala, Siva, Prasad1 aArchana, Ramakrishnan1 aNayak, Chandrani1 aBhattacharyya, D.1 aJha, S., N.1 aKrishnamurty, Sailaja1 aRaja, Thirumalaiswamy uhttps://library.ncl.res.in/content/mnxwo4-nanostructure-based-catalysts-single-step-oxidation-cyclohexane-and-methane02332nas a2200313 4500008004100000022001400041245008900055210006900144260000800213300000800221490000700229520130700236653002101543653004501564653002001609653002601629100001701655700001701672700001901689700001801708700002101726700003001747700002601777700002801803700002401831700002601855700002301881856011401904 2024 eng d a1388-076400aAn effective, facile, and rapid synthesis of nanosized Mn3O4 using a microwave route0 aeffective facile and rapid synthesis of nanosized Mn3O4 using a  cOCT a2390 v263 a

Microwave-assisted one-pot, one-step, calcination-free synthesis of nanosized Mn3O4 is reported using only benzylamine and manganese acetate. Benzylamine in this protocol plays a vital role for efficient microwave synthesis. This microwave method enables the synthesis of nanosized Mn3O4 in just few hours only in a single step eliminating the need of calcinations of any intermediate. The synthesized nanosized Mn3O4 was analyzed by XRD, HRTEM, EDAX, and Raman spectroscopy. The catalytic and electrochemical properties of as-synthesized Mn3O4 were investigated. In galvanostatic charge-discharge experiments, after 800 cycles, more than 89% capacitance was retained for electrodes made by as synthesized Mn3O4 nanomaterials indicating its very good stability. In the catalytic conversion of cinnamyl alcohol to cinnamaldehyde via oxidation, using as prepared nanosized Mn3O4 as a catalyst, it displays effective catalytic properties. A probable mechanical study of its formation was also envisaged. This synthesis protocol is additive-free, occurs in a short time, is facile, is energy efficient, and eliminates the use of many chemicals. These silent features make these reported protocols economically viable and environmentally benign which adhere to the principles of Green Chemistry.

10aCalcination free10aElectrochemical and catalytic properties10aNanosized Mn3O410aSingle-step synthesis1 aYadav, Akash1 aJha, Ratnesh1 aBhatkar, Akash1 aKamble, Aditi1 aVaishnav, Vishal1 aBogalera, Shivamurthy, P.1 aManikandan, Marimuthu1 aNayaka, Girish, Praveen1 aUmbarkar, Shubhangi1 aRaja, Thirumalaiswamy1 aBhatte, Kushal, D. uhttps://library.ncl.res.in/content/effective-facile-and-rapid-synthesis-nanosized-mn3o4-using-microwave-route02469nas a2200241 4500008004100000022001400041245013900055210006900194260000900263300001600272490000700288520157200295100002101867700002001888700003701908700002601945700002501971700001901996700003202015700001902047700002602066856013502092 2024 eng d a1144-054600aNew insights into the composition and catalytic performance of VOx-Ga/γ-Al2O3 for the oxidative dehydrogenation of propane to propene0 aNew insights into the composition and catalytic performance of V cAUG  a15077-150870 v483 a

Oxidative dehydrogenation (ODH) of propane is a promising alternative route for propene production. In this work, we developed a series of vanadium and gallium oxides supported on gamma-Al2O3 catalysts by an incipient wetness impregnation method. Among the employed catalysts, the VGA-2 showed superior catalytic activity, and the catalyst was demonstrated for longevity in ODH of propane with a stable activity using a continuous flow fixed bed reactor at 400 degrees C. H-2-TPR and UV-visible spectra showed the presence of highly dispersed monomeric VOx species with tetrahedral coordination geometry, which influences product selectivity. The characterization results also conferred that the redox nature of vanadium (V5+ and V4+) oxide and higher V5+ content on the surface of the VGA-2 catalysts are more favourable for C-H activation. In addition, the pyridine-FTIR and Ga-71 solid-state NMR studies further substantiated the presence of Lewis acid sites and tetrahedrally coordinated Ga3+Ox species that are highly responsible for the ODHP activity, respectively. Furthermore, in situ-DRIFTS studies conferred that the propane adsorption at ambient temperature showed the formation of intermediate propoxide species with the evolution of sigma-bonds and with further increase in the temperature to 325 degrees C; the stretching vibrations of the =C-H and -C-H bonds in the propylene molecule were observed. The spent catalysts were also analyzed by thermogravimetric analysis, where the optimized catalyst (VGA-2) showed the least coke deposition.

1 aKandasamy, Prabu1 aGawali, Sheetal1 aVenugopalan, Aswathy, Thareparam1 aManikandan, Marimuthu1 aMekala, Siva, Prasad1 aShelke, Ankita1 aAjithkumar, Thalasseril, G.1 aBhatte, Kushal1 aRaja, Thirumalaiswamy uhttps://library.ncl.res.in/content/new-insights-composition-and-catalytic-performance-vox-ga%CE%B3-al2o3-oxidative-dehydrogenation00931nas a2200265 4500008004100000022001400041245011100055210007000166260000800236490000700244653001600251653001500267653002100282100002400303700002600327700002100353700002300374700002600397700002600423700002200449700002300471700001900494700002600513856012600539 2024 eng d a2192-650600aTemperature-controlled hydrothermal synthesis of α-MnO2 nanorods for catalytic oxidation of cyclohexanone0 aTemperaturecontrolled hydrothermal synthesis of αMnO2 nanorods f cJUL0 v8910aAdipic Acid10aconversion10aMANGANESE OXIDES1 aJha, Ratnesh, Kumar1 aManikandan, Marimuthu1 aPrabu, Marimuthu1 aVineeth, Nidhi, R.1 aDharmalingam, Praveen1 aArchana, Ramakrishnan1 aHarsha, Murudappa1 aShankar, Sonu, Ram1 aBhatte, Kushal1 aRaja, Thirumalaiswamy uhttps://library.ncl.res.in/content/temperature-controlled-hydrothermal-synthesis-%CE%B1-mno2-nanorods-catalytic-oxidation02207nas a2200313 4500008004100000022001400041245013600055210006900191260000800260300001100268490000800279520114300287653002701430653002201457653002401479653001201503653002201515653001301537100002101550700002601571700002401597700002601621700002201647700002501669700001801694700002701712700002601739856012801765 2025 eng d a1385-894700aDeciphering the intricate mechanisms behind the selective oxidation of methane to C1 and C2 oxygenates over FeAu/γ-Al2O3 catalysts0 aDeciphering the intricate mechanisms behind the selective oxidat cMAY a1625100 v5123 a

In this work, we demonstrate an eco-benign synthesis protocol for preparing gold nanoparticles and the role of the strong interaction between gold nanoparticles and iron oxide in FeAu/gamma-Al2O3 catalysts that render it an anionic (Au delta-) character while tailoring them in a smaller size. The multifunctional FeAu/gamma-Al2O3 catalyst selectively produces ethanol (95 % selectivity, similar to 240 mu mol(-1) cat) at a mild temperature of 75 degrees C without the addition of co-reactants during liquid phase methane oxidation with molecular oxygen. Conversely, Au/gamma-Al2O3 and Fe/gamma-Al2O3 catalysts exhibited high selectivity for CH3OH and HCHO. A high dispersion accompanied by strong electronic interaction between the Au delta–FeOx, as corroborated by diverse techniques, enables methane activation across the interface and coupling on the gold nanoparticles, which are responsible for the markedly improved formation of ethanol. Furthermore, in situ DRIFTS studies and DFT investigations point to a reaction mechanism of coupling of CH2OH and CH3 intermediates as the most likely route for ethanol formation.

10aAnionic gold catalysts10aAu-FeOx synergism10aC-H bond activation10aEthanol10aMethane oxidation10aMethanol1 aPrabu, Marimuthu1 aManikandan, Marimuthu1 aRengam, Sathya, Sai1 aRamakrishnan, Archana1 aRaja, Abhishekram1 aUrkude, Rajashri, R.1 aGhosh, Biplab1 aVarghese, Jithin, John1 aRaja, Thirumalaiswamy uhttps://library.ncl.res.in/content/deciphering-intricate-mechanisms-behind-selective-oxidation-methane-c1-and-c2-oxygenates02493nas a2200325 4500008004100000022001400041245010800055210006900163260000900232300000800241490000800249520144900257653001301706653002001719653002001739653002901759100001701788700001701805700001901822700002001841700001801861700002601879700002101905700002101926700001801947700002401965700002601989700002302015856012902038 2025 eng d a0974-362600aFacile and eco-friendly synthesis of Mn2O3 nanoparticles via microwave-assisted glycerol-thermal method0 aFacile and ecofriendly synthesis of Mn2O3 nanoparticles via micr cNOV  a1020 v1373 a

Microwave-assisted efficient synthesis of nanosized manganese oxide (Mn2O3) is reported using glycerol and manganese acetate. Glycerol in this reported methodology acts as an efficient solvent for this nanomaterial synthesis under microwave radiation. This reported method enables the synthesis of nanosized Mn2O3 without further use of additives, stabilizers, and bases other than glycerol and manganese precursor. Glycerol is a renewable biomaterial derived nonvolatile and nontoxic, safe solvent. It has a high boiling point and dielectric constant, which makes it an ideal solvent for microwave synthesis. The synthesized nanosized Mn2O3 was analyzed by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. We examined the catalytic properties of as-synthesized Mn2O3 for cinnamyl alcohol oxidation to cinnamaldehyde. In this oxidation activity experiment, nanosized Mn2O3 exhibits good conversion and selectivity towards the desired product. We also made an attempt to understand the probable mechanism of nanomaterial formation and found some conclusive evidence to support it. This research methodology is facile, energy efficient, and involves minimum chemicals for synthesis. It makes this reported methodology not only economically attractive but also environmentally friendly, which aligns well with green chemistry principles.

10aGlycerol10agreen chemistry10aNanosized Mn2O310ananostructured catalysis1 aYadav, Akash1 aJha, Ratnesh1 aBhatkar, Akash1 aGehlot, Bhavika1 aKamble, Aditi1 aManikandan, Marimuthu1 aBhosale, Hritvik1 aVaishnav, Vishal1 aRathod, Rutik1 aUmbarkar, Shubhangi1 aRaja, Thirumalaiswamy1 aBhatte, Kushal, D. uhttps://library.ncl.res.in/content/facile-and-eco-friendly-synthesis-mn2o3-nanoparticles-microwave-assisted-glycerol-thermal