01084nas a2200181   4500008004100000022001400041245010100055210006900156260008400225300001200309490000700321520034500328100002100673700002800694700002500722700002900747856012600776       2010                        eng d  a0366-702200aHydroxyalkylation of p-Cresol to 2,2 `-methylenebis(4-methylphenol) using Sn/Si-MCM-41 catalysts0 aHydroxyalkylation of pCresol to 22 methylenebis4methylphenol usi  a1-5 KANDA-SURUGADAI CHIYODA-KU, TOKYO, 101-8307, JAPANbCHEMICAL SOC JAPANcFEB  a126-1270 v393 a<p>Sn/Si-MCM-41 has exhibited an excellent catalytic activity [70% product yield with 88% selectivity to 2,2'-methylenebis(4-methylphenol)] for the selective hydroxyalkylation of p-cresol. At equal level of Sn loading, Sn/Si-MCM-41 prepared by direct hydrothermal synthesis showed higher activity than Sn-impregnated Si-MCM-41 catalyst.</p>1 aGarade, Ajit, C.1 aNiphadkar, Prashant, S.1 aJoshi, Praphulla, N.1 aRode, Chandrashekhar, V.  uhttps://library.ncl.res.in/content/hydroxyalkylation-p-cresol-22-methylenebis4-methylphenol-using-snsi-mcm-41-catalysts-001745nas a2200241   4500008004100000022001400041245014400055210006900199260007900268300001200347490000700359520080600366653001301172653002501185653001001210653002901220653003101249100002401280700002201304700002801326700002501354856012401379       2016                        eng d  a1226-086X00aHierarchical K/LTL zeolites: synthesis by alkali treatment, characterization and catalytic performance in knoevenagel condensation reaction0 aHierarchical KLTL zeolites synthesis by alkali treatment charact  a360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USAbELSEVIER SCIENCE INCcAUG  a128-1360 v403 a<p>The hierarchical K/LTL zeolites prepared by post-synthesis modification with aqueous 1.5 M KOH solution by varying alkali volume to K/LTL zeolite (10-70 ml/g) ratios, were examined in Knoevenagel condensation. The physico-chemical properties of the catalysts were thoroughly evaluated by PXRD, ICP, CO2-TPD, XPS, N-2 adsorption/desorption and Si-29 and Al-22 MAS-NMR. Among all the samples, hierarchical K/LTL prepared by treating K/LTL with 50 ml aqueous 1.5 M KOH solution per gram of K/LTL displayed about 1.5 fold higher catalytic activity as compared to parent K/LTL, presumably because of combined effect of enhanced basicity and molecular diffusion through pore channels. (C)2016 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.</p>10aBasicity10aHierarchical zeolite10aK/LTL10aKnoevenagel condensation10aMicro-mesoporous composite1 aTangale, Nilesh, P.1 aSonar, Shilpa, K.1 aNiphadkar, Prashant, S.1 aJoshi, Praphulla, N.  uhttps://library.ncl.res.in/content/hierarchical-kltl-zeolites-synthesis-alkali-treatment-characterization-and-catalytic01919nas a2200169   4500008004100000245015000041210006900191260000800260300001200268490000600280520123500286100002201521700002801543700002401571700002201595856013201617       2018                        eng d00aHxZr3-xPW12O40 as an insoluble and reusable heteropolyacid for highly selective dehydration of fructose to 5-hydroxymethyl fufural in DMSO system0 aHxZr3xPW12O40 as an insoluble and reusable heteropolyacid for hi  cJAN  a832-8360 v33 aDehydration of fructose is a way to produce an important platform chemical such as 5-hydroxymethylfurfural (HMF) which is widely used to synthesize variety of renewable chemicals and fuel. Heteropoly acid, H3PW12O40 is highly soluble strong acidic catalyst with well-defined structure. This study reports the modification of soluble heteropoly acid to insoluble and reusable heteropolyacid (HxZr3-xPW12O40 ) by exchanging with Zr and investigation of its catalytic performance in selective transformation of renewable fructose to 5-HMF in Dimethyl sulfoxide (DMSO) system. The physico-chemical properties of H(x)Zr(3-x)PW(12)O(40)were derived from Powder-XRD, NH3-TPAD and FT-IR technique. The characterization of HxZr3-xPW12O40 revealed that the Keggin structure of HPA remained intact as proton replaced by Zr. The partial exchange of Zr in H2Zr1PW12O40 catalyst resulted in an increase in acidity, however further increase of Zr above 1, acidity was found to be decreased. At optimized reaction condition, 5-HMF yield of 85% with 100% selectivity was achieved with H1Zr2 PW12O40 catalyst at much lower reaction time of 10 min than reported. The catalyst was observed to be recoverable, reusable as compared to parent H3PW12O40.1 aMulik, Nagesh, L.1 aNiphadkar, Prashant, S.1 aPandhare, Kiran, V.1 aBokade, Vijay, V.  uhttps://library.ncl.res.in/content/hxzr3-xpw12o40-insoluble-and-reusable-heteropolyacid-highly-selective-dehydration-fructose-5