01736nas a2200241   4500008004100000022001400041245014000055210006900195260007300264300001200337490000800349520081300357653001201170653003201182653001301214653002701227653001801254100002601272700001801298700002501316700002801341856012501369       2005                        eng d  a1381-116900aEpoxidation of styrene by anhydrous hydrogen peroxide over boehmite and alumina catalysts with continuous removal of the reaction water0 aEpoxidation of styrene by anhydrous hydrogen peroxide over boehm  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcMAR  a217-2220 v2273 a<p>Boehmite and alumina (obtained from the boehmite by its calcination at different temperatures 300-900degreesC) are active and stable catalysts for the selective epoxidation of styrene by anhydrous H2O2 to styrene oxide with continuous removal of the reaction water. Influence of the catalyst (boehemite) calcination temperature, H2O2/styrene ratio and catalyst loading on the styrene conversion and selectivity for styrene oxide. phenyl acetaldehyde. benzaldehyde and benzoic acid in the epoxidation has been investigated. In the presence of water. the catalyst shows very poor activity and selectivity in the epoxidation. The catalyst also catalyses H2O2 decomposition and hence has optimum loading for obtaining high-styrene conversion in the epoxidation. (C) 2004 Elsevier B.V. All rights reserved.</p>10aAlumina10aanhydrous hydrogen peroxide10aboehmite10aEpoxidation of styrene10aStyrene oxide1 aChoudhary, Vasant, R.1 aPatil, N., S.1 aChaudhari, Nitin, K.1 aBhargava, Suresh, Kumar  uhttps://library.ncl.res.in/content/epoxidation-styrene-anhydrous-hydrogen-peroxide-over-boehmite-and-alumina-catalysts-002623nas a2200301   4500008004100000022001400041245014300055210006900198260009500267300001200362490000800374520152800382653002701910653001201937653001701949653001801966653003001984653001802014653001202032653001202044100001802056700002102074700002602095700003002121700001602151700002602167856012802193       2005                        eng d  a0021-951700aOxidative dehydrogenation of ethylbenzene over vanadia-alumina catalysts in the presence of nitrous oxide: structure-activity relationship0 aOxidative dehydrogenation of ethylbenzene over vanadiaalumina ca  a525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USAbACADEMIC PRESS INC ELSEVIER SCIENCEcMAR  a484-4920 v2303 a<p>A series of vanadia-alumina catalysts with different vanadia contents were prepared by a wet impregnation method. The influence of the local structure of vanadia in these catalysts on the oxidative dehydrogenation of ethylbenzene with nitrous oxide was investigated. The use of N2O as a co-feed remarkably enhanced the styrene yield compared with the use of N-2. Characterization of these vanadia catalysts by XRD, FTIR, UV-vis, TPR, XPS, and V-51 NMR techniques suggests that the nature of the VOx species depends on the vanadia loading: the predominant species are monomeric vanadia at lower loadings, two-dimensional polyvanadates at intermediate loadings, and bulk-like V2O5 and AlVO4 at higher loadings. The rate of oxidative dehydrogenation (ODH) of ethylbenzene per vanadium atom increases with vanadia loading and reaches a maximum at 10 wt%, the loading at which the surface predominantly contains polyvanadate species. The observed variation in the selectivity of products with vanadium loading indicates that the monomeric V5+ species favors dehydrogenation, whereas bulk-like V2O5 preferentially participates in the dealkylation of ethylbenzene. The vanadium species remains at a higher oxidation state in the presence of N2O, leading to a higher styrene yield. than in a N-2 atmosphere. The ODH turnover rates increased with decreasing energy of the absorption edge in the UV-vis spectrum, at low VOx coverages of less than one monolayer on the Al2O3 surface. (c) 2005 Elsevier Inc. All rights reserved.</p>10aabsorption edge energy10aAlumina10aethylbenzene10aNitrous oxide10aoxidative dehydrogenation10apolyvanadates10astyrene10avanadia1 aShiju, N., R.1 aAnilkumar, Mettu1 aMirajkar, Subhash, P.1 aGopinath, Chinnakonda, S.1 aRao, B., S.1 aSatyanarayana, C., V.  uhttps://library.ncl.res.in/content/oxidative-dehydrogenation-ethylbenzene-over-vanadia-alumina-catalysts-presence-nitrous-001896nas a2200253   4500008004100000022001400041245008800055210006900143260009200212300001400304490000700318520097300325653001201298653001701310653002801327653003001355653001801385653002201403100002601425700001901451700002601470700003001496856011601526       2013                        eng d  a1533-488000aFunctional and disordered meso-macroporous gamma-Al2-xMxO3 +/- y (M = Cu and/or Ce)0 aFunctional and disordered mesomacroporous gammaAl2xMxO3 y M Cu a  a26650 THE OLD RD, STE 208, VALENCIA, CA 91381-0751 USAbAMER SCIENTIFIC PUBLISHERScAPR  a2682-26880 v133 aDisordered meso-macro porous Cu-Ce-Al2O3 nanocomposite (gamma-Al2-xMxO3 +/- y, M = Cu and or Ce) with different compositions has been synthesized. In situ templated sol-gel method has been adopted with simple EDTA ethylenediamine tetra aceticacid and ethylenediamine molecules to prepare gamma-Al2-xMxO3 +/- y, (M = Cu and or Ce). Above meso-macro porous materials were characterized by structural, spectroscopy, microscopy and textural techniques. Detailed characterization indicates that Cu2+ ions are introduced into the ceria and alumina lattice positions. Nano composite nature of the gamma-Al2-xMxO3 +/- y has been confirmed by detailed microscopy investigations. Catalytic activity of the above nanocomposite materials have been screened for environmentally important CO oxidation reaction. 30% Ce-60% Al and 10% Cu containing material shows the best activity among other meso-nnacroporous material with (50%) 100% CO oxidation at (107 degrees C) 145 degrees C.10aAlumina10aCO oxidation10aheterogeneous catalysis10aMeso-Macroporous Material10aNanocomposite10aSol-gel synthesis1 aGnanakumar, Edwin, S.1 aJohn, Jino, C.1 aRaja, Thirumalaiswamy1 aGopinath, Chinnakonda, S.  uhttps://library.ncl.res.in/content/functional-and-disordered-meso-macroporous-gamma-al2-xmxo3-y-m-cu-andor-ce-0