01799nas a2200181 4500008004100000022001400041245012100055210006900176260011000245300001400355490000700369520100200376100002801378700003701406700002701443700002601470856012101496 2013 eng d a1463-926200aOxidative dehydrogenation of ethyl benzene to styrene over hydrotalcite derived cerium containing mixed metal oxides0 aOxidative dehydrogenation of ethyl benzene to styrene over hydro aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcSEP a3259-32670 v153 a

Cerium containing mixed oxides derived from hydrotalcites was prepared and its catalytic activity was studied for oxidative dehydrogenation of ethyl benzene to styrene. Structural, spectroscopic and morphological features of the catalyst have been thoroughly examined with various physico-chemical characterization methods. Raman spectroscopy studies show evidence for oxygen vacancies in lower loadings of cerium which enhanced the oxygen migration. The transmission electron microscopy image showed good dispersion of ceria clusters on the mixed metal oxide. The catalytic activity results suggested that the conversion of ethyl benzene and styrene yield is stable for at least 12 hours without any significant catalyst deactivation. The styrene selectivity and ethyl benzene conversion were higher in a catalyst containing 0.03 mole percentage of cerium. Structural features of the spent catalysts have also been examined to demonstrate the stability of the catalyst during the reaction.

1 aVenugopal, Ashok, Kumar1 aVenugopalan, Aswathy, Thareparam1 aKaliyappan, Periyasamy1 aRaja, Thirumalaiswamy uhttp://library.ncl.res.in/content/oxidative-dehydrogenation-ethyl-benzene-styrene-over-hydrotalcite-derived-cerium-002177nas a2200193 4500008004100000022001400041245008900055210006900144260011000213300001600323490000600339520138500345100002401730700003701754700002601791700002201817700003001839856011401869 2014 eng d a2046-206900aGreen chemistry approach to styrene from ethylbenzene and air on MnxTi1-xO2 catalyst0 aGreen chemistry approach to styrene from ethylbenzene and air on aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcOCT a57087-570970 v43 a

Styrene (ST) is an industrially important commodity chemical, and design of a suitable catalyst, which provides high ethyl benzene (EB) conversion and styrene selectivity at Lower temperature with sustainable activity, is one of the major challenges in the field of heterogeneous catalysis. Manganese incorporated in titania (MnxT1-xO2) anatase Lattice, prepared via the solution combustion method, was evaluated for oxidative dehydrogenation (ODH) of EB with O-2 or air. MnxTi1-xO2 catalysts were characterized by different physiochemical methods. Up to 15% Mn could be introduced into the TiO2 Lattice. TEM and XRD indicate disordered mesoporosity, further confirmed by adsorption isotherm analysis. MnxTi1-xO2 catalysts were evaluated for ST synthesis from EB using air or oxygen as oxidant between 440 and 570 degrees C. Reaction conditions have been varied systematically, such as catalyst composition, and EB/air/O-2 flow. MnxTi1-xO2 shows sustainable 55% styrene yield for 45 h without deactivation under optimum conditions. A thorough analysis of spent catalysts demonstrates the conversion of initial anatase phase MnxTi1-xO2 to Mn3O4 supported on the rutile (R) phase of TiO2. The above change occurs in the first few hours of reaction and the Mn3O4 on R-TiO2 phase is the active phase of the catalyst and responsible for sustainable activity for Longer duration.

1 aNegi, Sanjay, Singh1 aVenugopalan, Aswathy, Thareparam1 aRaja, Thirumalaiswamy1 aSingh, Anand, Pal1 aGopinath, Chinnakonda, S. uhttp://library.ncl.res.in/content/green-chemistry-approach-styrene-ethylbenzene-and-air-mnxti1-xo2-catalyst-002075nas a2200205 4500008004100000245008600041210006900127260000800196300001200204490000800216520133700224100002101561700002101582700002801603700003701631700002801668700003001696700002601726856011701752 2016 eng d00aEffective and selective oxidation of 2-butanol over Mn supported catalyst systems0 aEffective and selective oxidation of 2butanol over Mn supported  cSEP a237-2460 v5253 a

Oxidation of alcohols to their corresponding aldehydes/ketones is an important reaction in industries as well as in academic perspective. Selective oxidation (Selox) of alcohols like methanol, ethanol and propanol are well studied in literature; however, alcohols like butanol, pentanol, octanol is a challenging task. Selective oxidation of 2-butanol to methyl ethyl ketone (MEK) is an important reaction due to its wide range of applications. Herein, we demonstrated the selective oxidation of 2-butanol to MEK over Mn supported on different oxide supports. A series of MnxOy-Al2O3 (MA), MnxOy-CeO2 (MC), MnxOy-ZrO2 (MZ) and MnxOy-SiO2 (MS) catalysts were prepared by co-precipitation followed by hydrothermal method. As synthesised catalysts were characterised by various physico-chemical characterisation techniques. It was found that the presence of Mn3O4 species in MA and MZ catalysts is responsible for maximum catalytic activity towards 2-butanol oxidation. MA catalyst conferred a maximum 2-butanol conversion of 51% and 88% selectivity towards MEK. XPS analysis revealed that Mn in MA catalyst exists in +2 and +3 oxidation states and responsible for 2-butanol oxidation. Moreover it was found that the acidity of the catalyst also plays an important role in catalytic activity. (C) 2016 Published by Elsevier B.V.

1 aPrabu, Kandasamy1 aPrabu, Marimuthu1 aVenugopal, Ashok, Kumar1 aVenugopalan, Aswathy, Thareparam1 aSandilya, W., V. Y. Sai1 aGopinath, Chinnakonda, S.1 aRaja, Thirumalaiswamy uhttp://library.ncl.res.in/content/effective-and-selective-oxidation-2-butanol-over-mn-supported-catalyst-systems01825nas a2200157 4500008004100000245013500041210006900176260000800245490000800253520117200261100002101433700001901454700003701473700002601510856013101536 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 uhttp://library.ncl.res.in/content/highly-efficient-and-reusable-ru-nay-catalyst-base-free-oxidation-5-hydroxymethylfurfural-2501987nas a2200241 4500008004100000022001400041245009600055210006900151260000800220300001100228490000800239520117000247653000901417653001401426653001401440653002301454653003401477100003701511700002101548700003101569700002601600856011901626 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 uhttp://library.ncl.res.in/content/promoted-mesoporous-fe-alumina-catalysts-non-oxidative-dehydrogenation-isobutane02468nas a2200241 4500008004100000022001400041245013900055210006900194260000900263300001600272490000700288520157200295100002101867700002001888700003701908700002601945700002501971700001901996700003202015700001902047700002602066856013402092 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 uhttp://library.ncl.res.in/content/new-insights-composition-and-catalytic-performance-vox-ga%CE%B3-al2o3-oxidative-dehydrogenation