02054nas a2200229 4500008004100000020001800041022001400059245009100073210006900164260012300233300001200356490000800368520119500376100001901571700002201590700002101612700001301633700002801646700001501674700001701689856011801706 2005 eng d a0-444-51748-0 a0167-299100aImmobilized molybdovanadophosphoric acids on SBA-15 for selective oxidation of alkenes0 aImmobilized molybdovanadophosphoric acids on SBA15 for selective a Niagara Falls, CanadabElsevier Science BV, Sara Burgerhartstraat 25, Po Box 211, 1000 AE Amsterdam, NetherlandscJUN a769-7780 v1563 a

Vanadium substituted molybdophosphoric acids have been immobilized on amine functionalized SBA-15 and characterized by different techniques. Small angle X-ray scattering analysis and SEM technique provide evidence for the structural integrity of the samples. UV-Vis, NMR and IR data confirm the incorporation of molybdovanadophosphoric acids onto the amine functionalized SBA-15. The textural properties of these materials were studied by nitrogen sorption studies. Oxidation of cyclooctene and norbornene was carried out with oxidants in aqueous (aq. H2O2) and non-aqueous (TBHP extracted in dichloroethane) medium. The reactions were carried out with both the neat catalysts (homogeneous) and the immobilized catalysts (heterogenized) and the results were compared. The selectivity of the desired products was always > 99% with the immobilized catalyst with both aq.H2O2 and TBHP. However, while the leaching was negligible in the non-aqueous medium, the aqueous medium leads to considerable leaching. The immobilized catalysts could be separated after the reaction and the reusability of the catalyst has also been demonstrated especially with oxidant in the nonaqueous medium.

1 aRaj, N., K. K.1 aDeshpande, S., S.1 aIngle, Rohit, H.1 aRaja, T.1 aManikandan, Palanichamy1 aSayari, A.1 aJaroniec, M. uhttps://library.ncl.res.in/content/immobilized-molybdovanadophosphoric-acids-sba-15-selective-oxidation-alkenes-001834nas a2200253 4500008004100000022001400041245019100055210006900246260007300315300001000388490000800398520085200406653001201258653001201270653001701282653001401299653002801313653002001341653002101361100002101382700002101403700002801424856012801452 2007 eng d a1381-116900a[SbW9O33]-based polyoxometalate combined with a phase transfer catalyst: A highly effective catalyst system for selective oxidation of alcohols with H2O2, and spectroscopic investigation0 aSbW9O33based polyoxometalate combined with a phase transfer cata aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcFEB a52-580 v2623 a

Na-9[SbW9O33] in conjunction with a phase transfer catalyst, methyltricapryl ammonium chloride, is highly efficient for selective oxidation of variety of alcohols with aq. H2O2 to yield corresponding carbonyls. Most importantly the reactions are carried out in the absence of any organic solvents especially halogenated solvents. In case of allylic alcohols, the catalyst is highly selective for the alcohol oxidation reaction and least selective for epoxidation reaction in the presence of aq. H2O2. IR studies support the formation of W-peroxo intermediate species and also support the stability of the catalyst in the presence of phase transfer compound under the present experimental condition. The catalyst can be reused after careful decomposition of peroxide of the final reaction mixture. (c) 2006 Elsevier B.V. All rights reserved.

10aAlcohol10aAq.H2O210aNag[SbW9O33]10aOxidation10aPhase transfer catalyst10aPolyoxometalate10apolyoxotungstate1 aIngle, Rohit, H.1 aRaj, N., K. Kala1 aManikandan, Palanichamy uhttps://library.ncl.res.in/content/sbw9o33-based-polyoxometalate-combined-phase-transfer-catalyst-highly-effective-catalyst01741nas a2200241 4500008004100000022001400041245009600055210006900151260007300220300001200293490000600305520089500311653001201206653001601218653002101234653000901255653001201264653003401276100002101310700001301331700002801344856012701372 2008 eng d a1566-736700aAlkene epoxidation catalyzed by vanadomolybdophosphoric acids supported on hydrated titania0 aAlkene epoxidation catalyzed by vanadomolybdophosphoric acids su aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcMAR a931-9380 v93 a

Vanadomolybdophosphoric acids wet-impregnated oil hydrated titania (TiO(2) - xH(2)O), make ail efficient catalytic system for the epoxidation of a variety of alkenes with organic solvent extracted TBHP as the oxidant. By,in appropriate choice of solvent, the catalyst call be reused at least three times without much loss in the activity for subsequent runs. XRD shows that the heteropoly acid is uniformly dispersed over the support and up to 15 wt% loading of the heteropoly acid, no additional peak of the same call be seen in the XRD pattern of the catalyst. The reactivity varied with the nature of alkene but the major product was always the corresponding epoxide. The catalytic system is free of high temperature calcination steps and tedious multi-step procedures, normally encountered in the heter-ogenization of heteropoly acids. (c) 2007 Elsevier B.V. All rights reserved.

10aalkenes10aepoxidation10aheteropoly acids10aTBHP10atitania10avanadomolybdophosphoric acids1 aIngle, Rohit, H.1 aVinu, A.1 aHalligudi, Shivaraj, B. uhttps://library.ncl.res.in/content/alkene-epoxidation-catalyzed-vanadomolybdophosphoric-acids-supported-hydrated-titania-001775nas a2200229 4500008004100000022001400041245016400055210006900219260007300288300000900361490000800370520088700378653001201265653001701277653001601294653001801310653002801328653002101356100002101377700002101398856012601419 2008 eng d a1381-116900aLacunary Keggin type polyoxotungstates in conjunction with a phase transfer catalyst: an effective catalyst system for epoxidation of alkenes with aqueous H2O20 aLacunary Keggin type polyoxotungstates in conjunction with a pha aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcOCT a8-130 v2943 a

Na-9[SbW9O33] in conjunction with a phase transfer catalyst (methyl tricapryl ammonium chloride) is a highly efficient catalytic system for the selective epoxidation of alkenes with aqueous H2O2 as the oxidant. Importantly, the reactions can be carried out in the absence of any organic solvents. The alkene epoxidation reactions with both, a transition metal ion substituted polyoxotungstate as well as a transition metal ion free polyoxotungstate precursor indicates that the tungstate group is the active center for the oxidation reaction. It was also observed that the transition metal ion does not play any significant role in the reaction. IR studies support the formation of tungsten-peroxo species and also show that the catalyst is stable in the presence of phase transfer catalyst when aqueous H2O2 is used as an oxidant. (C) 2008 Elsevier B.V. All rights reserved.

10aalkenes10aAqueous H2O210aepoxidation10aNa-9[SbW9O33]10aPhase transfer catalyst10apolyoxometalates1 aIngle, Rohit, H.1 aRaj, N., K. Kala uhttps://library.ncl.res.in/content/lacunary-keggin-type-polyoxotungstates-conjunction-phase-transfer-catalyst-effective-002785nas a2200289 4500008004100000022001400041245018600055210006900241260006100310300001000371490000800381520172800389653001602117653001102133653001302144653002202157653002402179100002902203700002102232700002002253700002102273700001302294700001702307700001802324700002802342856012502370 2008 eng d a1011-372X00aSelective oxidation of ethane over Mo-V-Al-O oxide catalysts: insight to the factors affecting the selectivity of ethylene and acetic acid and structure-activity correlation studies0 aSelective oxidation of ethane over MoVAlO oxide catalysts insigh a233 SPRING STREET, NEW YORK, NY 10013 USAbSPRINGERcFEB a39-510 v1213 a

Catalysts of general formula, MoVAlOx were prepared with the initial elemental composition of 1:0.34:0.167 (Mo:V:Al) at a pH value in the range of 1-4. The elemental analysis showed that the final composition of the catalysts is pH dependant. The performance of the catalysts was tested for selective oxidation of ethane to give ethylene and acetic acid. While all of them were active for ethane oxidation with a moderate conversion, the catalyst prepared at pH 2 showed a highest activity with 23% ethane conversion and a combined selectivity of 80.6% to ethylene and acetic acid. The catalyst prepared at pH 4 was least selective to ethylene and acetic acid. Various techniques like powder XRD, SEM, Raman, UV-Vis and EPR were used to characterize the catalysts and to identify the active phases responsible for the selective oxidation of ethane. The powder XRD data showed that the catalysts prepared at pH 1 and 2 contain mainly of MoO3 and MoV2O8 along with traces of Mo4O11. The amount of MoO3 was slightly higher in the catalyst prepared at pH 1. However, the catalyst prepared at pH 3 contains mainly of MoV2O8 with no trace of MoO3. The catalyst prepared at pH 4 showed V2O5 as the major phase along with MoVAlO4 phase. The Raman data corroborated the XRD results. EPR and UV-Vis studies indicated the presence of traces of V-4 in pH 1 and 2 catalysts and significant amount of Mo5+ in all the catalysts. Thus, the high activity and selectivity to ethylene and acetic acid are attributed to the presence of MoV2O8 phase and other reduced species like Mo4O11 phase supported on MoO3. The presence of V and Mo ions in a partially reduced form seems to play a crucial role in the selective oxidation of ethane.

10aAcetic acid10aethane10aEthylene10amixed metal oxide10aSelective oxidation1 aSankaranarayanan, T., M.1 aIngle, Rohit, H.1 aGaikwad, T., B.1 aLokhande, S., K.1 aRaja, T.1 aDevi, R., N.1 aRamaswamy, V.1 aManikandan, Palanichamy uhttps://library.ncl.res.in/content/selective-oxidation-ethane-over-mo-v-al-o-oxide-catalysts-insight-factors-affecting-0