02076nas 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-reaction02471nas a2200277   4500008004100000022001400041245014400055210006900199260000800268300001200276490000700288520152400295653001001819653001101829653003801840653001701878653002101895653002501916653001101941653002101952653003001973100001702003700002202020700002802042856012302070       2025                        eng d  a1022-552800aUltra-small Pd nanoparticles on SBA-15: an efficient catalyst for one-pot reductive alkylation of nitrobenzene with size-dependent activity0 aUltrasmall Pd nanoparticles on SBA15 an efficient catalyst for o  cFEB  a414-4290 v683 a<p>
	One-pot reductive alkylation of nitrobenzene with alcohol is an important organic synthesis reaction to form 2 degrees amines. In the present work, we have demonstrated that Pd/SBA-15 can be an effective catalytic system for this reaction. We have designed ultra-small Pd nanoparticles supported on SBA-15 for the synthesis of secondary amine, N-ethylaniline, through one-pot reductive alkylation of nitrobenzene with ethanol under ambient conditions. Ethanol functions both as the alkylating agent and the solvent in this process. The reaction is driven by the simultaneous hydrogenation of nitrobenzene to aniline, dehydrogenation of ethanol to aldehyde, and condensation of aniline and acetaldehyde to form N-ethylaniline. The size of the Pd nanoparticles plays a decisive role in the product selectivity. The undercoordinated sites present on ultra-small Pd NPs can facilitate ethanol dehydrogenation to acetaldehyde, thereby enhancing the selectivity towards N-ethylaniline compared to larger Pd nanoparticles. We have also studied the effect of different mesoporous supports such as SBA-15, MCM-41, and KIT-6 on the N-ethylaniline selectivity and found that SBA-15 was most selective. We have demonstrated that by carefully designing the catalyst such as controlling the Pd NPs size to obtain the maximum quantity of undercoordinated sites and choosing suitable support, the aliphatic alcohols can also be used for reductive alkylation of nitrobenzene in one-pot with optimum yields of N-alkylaniline.</p>
10aKIT-610aMCM-4110aModified deposition precipitation10anitrobenzene10aPd nanoparticles10aReductive alkylation10aSBA-1510asecondary amines10aUndercoordinated Pd sites1 aSoni, Yogita1 aPhilip, Milda, C.1 aVinod, Chathakudath, P.  uhttps://library.ncl.res.in/content/ultra-small-pd-nanoparticles-sba-15-efficient-catalyst-one-pot-reductive-alkylation