01934nas a2200277   4500008004100000022001400041245010500055210006900160260011000229300001600339490000600355520091900361100001901280700002501299700001601324700001801340700002201358700002701380700002301407700001701430700001701447700001701464700002001481700002401501856013101525       2015                        eng d  a2046-206900aMesoporous TUD-1 supported indium oxide nanoparticles for epoxidation of styrene using molecular O-20 aMesoporous TUD1 supported indium oxide nanoparticles for epoxida  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcMAY  a46850-468600 v53 a<p>Activation of molecular O-2 by metal or metal oxide nanoparticles is an area of recent research interest. In this work, for the first time, we report that indium oxide nanoparticles of &lt;3 nm size dispersed on mesoporous silica (TUD-1) can activate molecular O-2 and produce styrene epoxide with a selectivity of 60% and styrene conversion around 25% under mild conditions. It is found that neither indium oxide nor TUD-1 themselves respond to the styrene epoxidation reaction. The computational studies provide evidence that an oxygen molecule is highly polarized when it is located near the interface of both surfaces. The kinetic study shows that the reaction is of pseudo-first order and that the activation energy for styrene conversion is 12.138 kJ mol(-1). The catalysts are recyclable for up to four regeneration steps, with the styrene conversion and styrene epoxide selectivity almost unchanged.</p>1 aRahman, Sumbul1 aFarooqui, Saleem, A.1 aRai, Aditya1 aKumar, Rawesh1 aSantra, Chiranjit1 aPrabhakaran, Vinod, C.1 aBhadu, Gopala, Ram1 aSen, Debasis1 aMazumder, S.1 aMaity, Sudip1 aSinha, Anil, K.1 aChowdhury, Biswajit  uhttps://library.ncl.res.in/content/mesoporous-tud-1-supported-indium-oxide-nanoparticles-epoxidation-styrene-using-molecular-002076nas a2200289   4500008004100000022001400041245008500055210006900140260000900209300001200218490000800230520120100238653001801439653001701457653001101474653000901485653001101494100001801505700001601523700002201539700002601561700001701587700001701604700002801621700002401649856011301673       2016                        eng d  a1387-181100aHighly stable In-SBA-15 catalyst for vapor phase Beckmann rearrangement reaction0 aHighly stable InSBA15 catalyst for vapor phase Beckmann rearrang  cNOV   a293-3020 v2343 a<p>The Indium doped SBA-15 material was prepared by sol-gel method and tested for vapor phase Beckman rearrangement reaction. Among three indium loading, In/Si ratio of 2/100 was found as an optimum composition in terms of caprolactam selectivity (100%) and cyclohexanone oxime conversion (100%). The catalysts were characterized by N-2 adsorption, small-angle X-rays/neutron scattering (SAXS/SANS), XRD, FESEM, HRTEM, EDX, UV, FTIR and NH3-TPD techniques. In-situ SANS experiment was performed on the adsorption of CO2 to detect the micropores in the mesopore wall. All catalysts samples have highly ordered hexagonal structure with well dispersed indium in the silica matrix. The fine tuning of weak and strong acid sites were found in indium doped SBA-15 (In/Si = 2/100) catalyst. The same catalyst showed optimum catalytic performance, high space time yield 114.4 mol/h/g(cat) and high stability till 6 h of reaction without deactivation. The micro-kinetic analysis showed that there were no external and internal diffusion limitations in the SBA-15 catalyst. The reaction mechanism of Beckmann rearrangement over In-SBA-15 has been elucidated. (C) 2016 Elsevier Inc. All rights reserved.</p>10ae-Caprolactam10aIn-situ SANS10aindium10aSAXS10aSBA-151 aKumar, Rawesh1 aShah, Sneha1 aBahadur, Jitendra1 aMelnichenko, Yuri, B.1 aSen, Debasis1 aMazumder, S.1 aVinod, Chathakudath, P.1 aChowdhury, Biswajit  uhttps://library.ncl.res.in/content/highly-stable-sba-15-catalyst-vapor-phase-beckmann-rearrangement-reaction01654nas a2200253   4500008004100000022001400041245016200055210006900217260000900286300001400295490000600309520073200315653003201047653001401079653001801093653003401111653002001145100002701165700002701192700001701219700001701236700002401253856012301277       2019                        eng d  a2365-654900aPalladium impregnated amine Co-condensed hexagonal mesoporous silica: a novel catalyst in tailoring suzuki and heck coupling reactions in base free condition0 aPalladium impregnated amine Cocondensed hexagonal mesoporous sil  cAPR   a3823-38320 v43 a<p>Palladium impregnated amine co-condensed hexagonal mesoporous silicas (HMS-X) were synthesized (sol-gel process) using different amines (Ethylene diamine and pyridine) of various concentrations (0.25 equiv. and 2 equiv.). The effect of amine concentration on the local structure of hexagonal mesoporous silica was studied. The catalyst shows excellent catalytic activity and high TOF towards both Suzuki and Heck coupling reactions without using any base in reaction medium with the solvent DMF:water in (1:1) ratio. The catalyst was reused and it was recyclable up to three cycle without any appreciable loss of activity and the kinetics of the reaction varying different parameters also have been studied thoroughly.</p>
10aAmine functionalized silica10aBase free10aHeck reaction10aPalladium supported catalysts10aSuzuki reaction1 aDas, Prangya, Paramita1 aPrabhakaran, Vinod, C.1 aNanda, Samik1 aSen, Debasis1 aChowdhury, Biswajit  uhttps://library.ncl.res.in/content/palladium-impregnated-amine-co-condensed-hexagonal-mesoporous-silica-novel-catalyst