04507nas 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-catalyst01974nas a2200193 4500008004100000022001400041245012200055210006900177260000900246300001200255490000600267520126000273100001901533700002201552700002101574700002901595700002601624856013001650 2020 eng d a2398-490200aInsights into the catalytic activity of Ru/NaY catalysts for efficient H-2 production through aqueous phase reforming0 aInsights into the catalytic activity of RuNaY catalysts for effi cFEB  a678-6900 v43 a

Ruthenium nanoparticles supported on NaY zeolite catalysts were synthesized by a simple ion exchange method. The structural and morphological features of the catalysts were systematically investigated using numerous techniques such as N-2-sorption, XRD, CO2-TPD, H-2-TPR, TEM, SEM, ICP-OES, TGA, CHN analysis, XPS, in situ CO-FTIR and NMR spectroscopy. These novel Ru-NaY catalysts were highly active and selective for H-2 production through aqueous phase reforming (APR) of glycerol and ethylene glycol. Among the various catalysts evaluated for H-2 production, the 3 wt% Ru-NaY catalyst demonstrated the highest catalytic performance with excellent H-2 selectivity and this catalyst exhibits better activity as compared to many state of the art catalysts reported so far. The superior catalytic activity of 3 wt% Ru-NaY was attributed to the appropriate Ru metal loading, good metal dispersion, small size of Ru nanoparticles, better metal-support interaction, and higher availability of catalytically active sites (Ru-0) and facilitated water gas shift (WGS) reaction. This catalytic activity result clearly shows that NaY zeolite supported Ru nanoparticles catalysts have excellent potential for H-2 production from biomass-derived compounds.

1 aGogoi, Pranjal1 aNagpure, Atul, S.1 aKandasamy, Prabu1 aSatyanarayana, C., V. V.1 aRaja, Thirumalaiswamy uhttps://library.ncl.res.in/content/insights-catalytic-activity-runay-catalysts-efficient-h-2-production-through-aqueous-phase01826nas a2200157 4500008004100000245013500041210006900176260000800245490000800253520117200261100002101433700001901454700003701473700002601510856013201536 2021 eng d00aHighly efficient and reusable Ru-NaY catalyst for the base free oxidation of 5-Hydroxymethylfurfural to 2,5-Furandicarboxylic acid0 aHighly efficient and reusable RuNaY catalyst for the base free o cSEP0 v3753 a

Oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) is an important reaction for the production of recyclable bio-based polymers. Herein, we report a series of Ru nanoparticles supported on NaY zeolites catalysts for the oxidation of HMF to FDCA. The catalysts were prepared by simple ion exchanged method. Among all the catalysts, the optimized 3 wt % Ru-NaY catalyst showed superior catalytic activity under base free conditions with a shorter period of reaction time. The conversion of HMF was 100 % with 94 % FDCA yield. This catalyst was reused for fourth cycles, with an insignificant decrease in the yield of FDCA. H2-chemisorption and HRTEM studies confirmed that high metal dispersion and small size of Ru nanoparticles play vital roles for the HMF oxidation. In addition, the acidic hydroxyl groups of the supercage as well as higher amount of metallic Ru° are also responsible for the high yield and productivity of FDCA.

1 aKandasamy, Prabu1 aGogoi, Pranjal1 aVenugopalan, Aswathy, Thareparam1 aRaja, Thirumalaiswamy uhttps://library.ncl.res.in/content/highly-efficient-and-reusable-ru-nay-catalyst-base-free-oxidation-5-hydroxymethylfurfural-2501988nas a2200241 4500008004100000022001400041245009600055210006900151260000800220300001100228490000800239520117000247653000901417653001401426653001401440653002301454653003401477100003701511700002101548700003101569700002601600856012001626 2021 eng d a1566-736700aPromoted mesoporous Fe-alumina catalysts for the non-oxidative dehydrogenation of isobutane0 aPromoted mesoporous Fealumina catalysts for the nonoxidative deh cFEB a1062630 v1503 a

Production of isobutene is commercially consequential and highly demanding from the end-use industries being a key platform molecule as well as an intermediate for a variety of value-added chemicals. Traditionally, isobutene is prepared via steam cracking and fluid catalytic cracking methods. However, the catalysts used in these conventional methods have disadvantages like coke formation, sintering, etc. In this study, the catalytic non-oxidative dehydrogenation of isobutane over acidic, alkaline, and noble metal promoted mesoporous iron-doped catalysts was investigated. Iron doping has a significant function in controlling isobutene selectivity. The synthesis method is crucial to achieve successful metal doping in the mesoporous alumina matrix. Promoted catalysts exhibited a notable difference in isobutane conversion with a marginal change in dehydrogenation selectivity. Silver promoted catalyst showed slightly higher isobutene yield due to the optimal catalytic properties. This catalyst was stable for a considerable duration, and coke deposition, as well as particle agglomeration, were observed to faintly inhibit the catalytic activity.

10airon10aIsobutane10aIsobutene10aMesoporous alumina10aNon-oxidative dehydrogenation1 aVenugopalan, Aswathy, Thareparam1 aKandasamy, Prabu1 aGupta, Nikitra, Nihalchand1 aThirumalaiswamy, Raja uhttps://library.ncl.res.in/content/promoted-mesoporous-fe-alumina-catalysts-non-oxidative-dehydrogenation-isobutane01853nas a2200277 4500008004100000022001400041245012800055210006900183260000800252300001400260490000800274520094000282653000601222653001301228653001601241653001101257653000901268653001901277653003001296100002901326700002101355700001901376700002201395700002601417856013201443 2021 eng d a1011-372X00aUtilizing the oxygen carrier property of cerium iron oxide for the low-temperature synthesis of 1,3-butadiene from 1-butene0 aUtilizing the oxygen carrier property of cerium iron oxide for t cOCT a3057-30660 v1513 a

Low-temperature oxidative dehydrogenation (ODH) of 1-butene to 1,3-butadiene is one of the challenging reactions in the polymer industry. Towards this a highly dispersed cerium iron oxide was synthesized by citrate gel combustion method and employed for the synthesis of 1,3-butadiene (BD) from 1-butene. The reaction was carried out at low temperature under an oxygen-free atmosphere in a continuous flow mode fixed bed reactor. A decrease in the lattice parameters observed from PXRD and high-resolution TEM analysis proved that iron occupies cerium sites in the crystal lattice. XPS, TPR, and oxygen uptake studies quantified the nature and abundance of different oxygen species. ODH was observed through consuming lattice oxygens. The vacancies generated could be filled by re-oxidation with an external supply of oxygen which will restore the catalytic activity demonstrating the Mars van Krevelen mechanism. [GRAPHICS] .

10a110a1-butene10a3-butadiene10aCerium10airon10aLattice oxygen10aoxidative dehydrogenation1 aVenugopalan, Aswathy, T.1 aKandasamy, Prabu1 aGogoi, Pranjal1 aRatneshkumar, Jha1 aThirumalaiswamy, Raja uhttps://library.ncl.res.in/content/utilizing-oxygen-carrier-property-cerium-iron-oxide-low-temperature-synthesis-13-butadiene-102016nas a2200313 4500008004100000022001400041245013600055210006900191260000800260300001100268490000800279520101300287653001901300653001101319653001401330653002801344653002201372653002001394100001601414700001801430700002101448700002101469700001901490700001301509700002201522700001301544700001301557856013201570 2022 eng d a0960-852400aUnraveling the reaction mechanism of selective C9 monomeric phenols formation from lignin using Pd-Al2O3-activated biochar catalyst0 aUnraveling the reaction mechanism of selective C9 monomeric phen cJAN a1262040 v3443 aThe conversion of biomass-derived lignin to valuable monomeric phenols at high selectivity is of paramount importance for sustainable biorefineries. In this study, a novel Pd-Al2O3 supported on activated biochar catalyst is developed for lignin hydrogenolysis. The catalyst characterization revealed that the (1 1 1) planes of both of Pd-0 and Al2O3 were exposed to the surface. The maximum lignin conversion of 70.4% along with high liquid yield (similar to 57 wt%) was obtained at 240 degrees C, 3 h and 3 MPa H-2 pressure. The total monomeric phenols yield in the liquid was 51.6 wt%, out of which C9 monomeric guaiacols constituted similar to 30.0 wt% with 38.0% selectivity to 4-propyl guaiacol. Using the reaction intermediate, coniferyl alcohol, chemoselective hydrogenation of C-alpha=C-beta is proved to occur over the Pd site, while dehydroxylation of C-gamma-OH is shown to occur over the alumina site. An impressive carbon atom economy of 60% was achieved for the production of monomeric phenols.10aHydrogenolysis10alignin10aMechanism10aPd-Al/activated biochar10aPropanol guaiacol10aPropyl guaiacol1 aGurrala, L.1 aKumar, M., M.1 aYerrayya, Attada1 aKandasamy, Prabu1 aCastano, Pedro1 aRaja, T.1 aPilloni, Giovanni1 aPaek, C.1 aVinu, R. uhttps://library.ncl.res.in/content/unraveling-reaction-mechanism-selective-c9-monomeric-phenols-formation-lignin-using-pd-al2o302469nas 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-dehydrogenation02440nas a2200289 4500008004100000022001400041245013400055210006900189260000800258300001100266490000800277520138900285653003601674653003401710653002501744653003101769653002601800653002401826100002101850700001901871700003701890700002001927700002201947700002601969700002601995856012902021 2026 eng d a1387-700300aEnhancing Ru dispersion and catalytic stability via nitrogen-doped mesoporous carbon supports for biomass-derived FDCA production0 aEnhancing Ru dispersion and catalytic stability via nitrogendope cJUN a1165610 v1883 a

The rational design of efficient and selective nanostructured catalysts represents a key strategy for transforming biomass-derived feedstocks into value-added chemicals and fuels. 5-hydroxymethylfurfural (HMF) has emerged as one of the most promising platform chemicals due to its versatile reactivity and potential to be transformed into a wide range of value-added products. Herein, we report the preparation of Ru nanoparticles supported on both N-free and N-doped mesoporous carbon via wetness impregnation, and their application in the catalytic oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) under mild reaction conditions. The 3wt% Ru-NMC-2 catalyst afforded complete HMF conversion with 83% yield of FDCA at 110 degrees C within 10 h under 10 bar O2. Our research reveals that the nitrogen content in the carbon matrix imparts basicity to the catalyst support, stabilizing smaller Ru metal nanoparticles and helping to maintain a higher metal dispersion (66%), thereby enhancing FDCA yield and turnover frequency. Furthermore, XPS analysis demonstrated that N doping in the carbon matrix would aid in stabilizing the higher availability of metallic Ru compared with nitrogen-free counterparts. The recyclability of the catalyst was demonstrated over 5 cycles, and it exhibited satisfactory catalytic performance towards FDCA yield.

10a5-Furandicarboxylic acid (FDCA)10a5-hydroxymethylfurfural (HMF)10abiomass valorization10aMetal-support interactions10anitrogen-doped carbon10aRuthenium catalysts1 aKandasamy, Prabu1 aGogoi, Pranjal1 aVenugopalan, Aswathy, Thareparam1 aPandey, Pragati1 aRaja, Abhishekram1 aManikandan, Marimuthu1 aRaja, Thirumalaiswamy uhttps://library.ncl.res.in/content/enhancing-ru-dispersion-and-catalytic-stability-nitrogen-doped-mesoporous-carbon-supports