02262nas a2200241   4500008004100000022001400041245010100055210006900156260007300225300001200298490000700310520141400317653001501731653001301746653001601759653001101775100001301786700001901799700002101818700002101839700002801860856013201888       2005                        eng d  a1387-181100aBenzylation of benzene and other aromatics by benzyl chloride over mesoporous AlSBA-15 catalysts0 aBenzylation of benzene and other aromatics by benzyl chloride ov  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcMAY  a195-2030 v803 a<p>Aluminum-containing mesoporous molecular sieves AISBA-15 with different n(Si)/n(Al), ratios and AIMCM-41 have been synthesized hydrothermally and characterized in detail by physicochemical methods, viz. XRD, N(2) adsorption and (27)Al NMR spectroscopy. The low angle XRD and N2 adsorption measurements reveal that the structural order of SBA-15 was retained after the incorporation of Al. The increase of the unit cell parameter with increasing aluminum content and (27)Al MAS NMR spectroscopy confirm the incorporation of aluminum in the framework. Benzylation of benzene and substituted benzenes reaction employing benzyl chloride as the alkylating agent over AISBA-15 and AIMCM-41 have been investigated. The influence of various reaction parameters such as reaction temperature, reactant feed ratio and catalyst amount affecting the activity and selectivity of AISBA-15, have been studied. Among the mesoporous catalysts studied, AISBA-15(45), where the number in parentheses indicates the molar nsilnA, ratio, shows both high conversion and high selectivity for the benzylation of benzene. The activity of this catalyst for the benzylation of different aromatic compounds is in the following order: benzene &gt; toluene &gt; p-xylene &gt; mesitylene &gt; anisole. Kinetics of the benzene benzylation over different catalysts have also been investigated. (c) 2005 Elsevier Inc. All rights reserved.</p>10aAlkylation10aAlSBA-1510aBenzylation10aSBA-151 aVinu, A.1 aSawant, D., P.1 aAriga, Katsuhiko1 aHartmann, Martin1 aHalligudi, Shivappa, B.  uhttps://library.ncl.res.in/content/benzylation-benzene-and-other-aromatics-benzyl-chloride-over-mesoporous-alsba-15-catalysts-002033nas a2200253   4500008004100000022001400041245009700055210006900152260007300221300001200294490000800306520115300314653001201467653001301479653002701492653002501519653001101544100001301555700002201568700002801590700001701618700002101635856012301656       2005                        eng d  a0926-860X00aHighly active and selective AlSBA-15 catalysts for the vapor phase tert-butylation of phenol0 aHighly active and selective AlSBA15 catalysts for the vapor phas  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcMAR  a207-2130 v2813 a<p>Hexagonally ordered mesoporous AISBA-15 catalysts having n(Si)/(nA]) ratios from 7 to 215 have been synthesized hydrothermally using a cheap non-ionic block copolymer as the structure-directing agent. The obtained materials were analyzed by XRD and nitrogen adsorption to determine the structural order and the textural properties. It has been observed by Al-27 MAS NMR spectroscopy that aluminum atoms are exclusively in tetrahedral coordination for all samples except AISBA-15(7), where octahedral aluminum has been detected to some extent. Temperature-programmed desorption of pyridine showed that AISBA-15(45) has a higher number of strong acid sites as compared to other mesoporous materials such as FeMCM-41, AIMCM-41 and FcAlMCM-41. The catalyst AlSBA-15(45)showed superior performance in the acid-catalyzed tertiary butylation of phenol employing tert-butanol as the alkylation agent. A high phenol conversion of 86.3% is observed for this catalyst at a reaction temperature of 150 degrees C. Over AISBA-15(45), the 4-TBP yield amounts to 40.5% and the 2,4-DTBP yield corresponds to 37.9%. (c) 2004 Elsevier B.V. All rights reserved.</p>10aAcidity10aAlSBA-1510aaluminum incorporation10abutylation of phenol10aSBA-151 aVinu, A.1 aDevassy, Biju, M.1 aHalligudi, Shivaraj, B.1 aBohlmann, W.1 aHartmann, Martin  uhttps://library.ncl.res.in/content/highly-active-and-selective-alsba-15-catalysts-vapor-phase-tert-butylation-phenol-002095nas a2200289   4500008004100000022001400041245016000055210006900215260007300284300001000357490000800367520107900375653001301454653002101467653001301488653001301501653001301514653001001527653002001537653001301557653001901570653001501589100002701604700001901631700002801650856012701678       2008                        eng d  a1381-116900aChemoselective synthesis of beta-amino acid derivatives by hydroamination of activated olefins using AISBA-15 catalyst prepared by post-synthetic treatment0 aChemoselective synthesis of betaamino acid derivatives by hydroa  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAPR  a16-230 v2843 a<p>beta-Amino acid derivatives have a wide variety of applications viz. in the synthesis of peptide analogues, precursor for amino alcohols, optically active amino acids, lactums and diamines. Chemoselective anti-Markovnikov hydroamination reaction of activated olefins was effectively used to synthesize beta-amino acid derivatives using AlSBA-15 and AlMCM-41 catalysts. These catalysts with different Si/Al ratios were synthesized by isomorphous substitution of aluminium into the framework of SBA-15, which induces the Bronsted and Lewis acid sites. The structural integrity of the catalysts was established by characterizing with XRD, N-2-sorption, TEM, NH3-TPD Al-27 MAS NMR and Si-29 MAS NMR techniques. Hydroamination of ethyl acrylate with aniline was used as a test reaction, which gave N-[2-(ethoxycarbonyl)ethyl] aniline with high selectivity. The performance of AlSBA-15 catalyst was also determined with different acrylates and amines to know the general applicability of the catalyst in hydroamination reactions. (C) 2008 Elsevier B.V. All rights reserved.</p>10aacrylate10aactivated olefin10aaddition10aAlMCM-4110aAlSBA-1510aAmine10abeta-amino acid10aCatalyst10ahydroamination10aMesoporous1 aShanbhag, Ganapati, V.1 aKumbar, S., M.1 aHalligudi, Shivaraj, B.  uhttps://library.ncl.res.in/content/chemoselective-synthesis-beta-amino-acid-derivatives-hydroamination-activated-olefins-001804nas a2200241   4500008004100000022001400041245008800055210006900143260007300212300001000285490000800295520097000303653001201273653001301285653001601298653001301314653002701327100001901354700001901373700001801392700003301410856011901443       2013                        eng d  a1387-181100aDehydration of fructose to 5-hydroxymethyl furfural over ordered AlSBA-15 catalysts0 aDehydration of fructose to 5hydroxymethyl furfural over ordered   aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcNOV  a38-460 v1813 a<p>5-Hydroxymethyl furfural is an important platform chemical. It is successfully synthesized from renewable carbohydrates using mesoporous AlSBA-15 catalysts under biphasic conditions. Fine tuning of the catalyst acidity is important to drive the reaction to give good yields of furan compound. Al-SBA-15 catalysts with different Si/Al ratios were prepared and characterized by XRD, Al-27 MASNMR, SEM, TEM, N-2 sorption, ICP-OES and TPD of ammonia. Results show that part of aluminium is substituted into tetrahedral positions. The catalyst with lower acid site density but medium to strong acid strength favours selective formation of HMF. Under the optimized conditions, HMF selectivity was as high as 88% at 59 mol% conversion of fructose. Leaching of part of aluminium occurs under hydrothermal conditions, if solvent mixtures containing water are used, while activity can be retained if DMSO is used as solvent. (c) 2013 Elsevier Inc. All rights reserved.</p>10aAcidity10aAlSBA-1510adehydration10afructose10aHydroxymethyl furfural1 aLucas, Nishita1 aKokate, Ganesh1 aNagpure, Atul1 aChilukuri, Satyanarayana, V.  uhttps://library.ncl.res.in/content/dehydration-fructose-5-hydroxymethyl-furfural-over-ordered-alsba-15-catalysts-0