02031nas a2200241   4500008004100000022001400041245016300055210006900218260007300287300001200360490000800372520113200380653001101512653001701523653000801540653001701548653001401565100002601579700001601605700001901621700001801640856013101658       2006                        eng d  a1381-116900aCobalt-containing hexagonal mesoporous molecular sieves (Co-HMS): Synthesis, characterization and catalytic activity in the oxidation reaction of ethylbenzene0 aCobaltcontaining hexagonal mesoporous molecular sieves CoHMS Syn  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAUG  a123-1300 v2553 a<p>Cobalt-containing hexagonal mesoporous materials (Co-HMS and Co/HMS) with different cobalt content were synthesized for the first time by direct hydrothermal and post-synthesis (grafting) method. The materials were characterized in detail by X-ray diffraction, BET surface area, N-2 sorption isotherms, SEM, TEM, UV-vis and XPS techniques. Powder X-ray diffraction pattern, N2 adsorption-desorption analysis and TEM analysis show the presence of hexagonal mesoporous structure, having Type W isotherms and reveals the typical wormhole-like morphology. Spectroscopic techniques like UV-vis and XPS reveal cobalt in +2 oxidation state and tetrahedrally coordinated. Liquid phase oxidation of ethylbenzene using TBHP (70 wt%) as an oxidant shows that the catalysts are highly active, under solvent free conditions as well as under lower cobalt concentrations. Leaching studies performed by hot filtration experiments show that the cobalt catalysts prepared by hydrothermal methods are stable, while the grafted catalysts show the leaching of cobalt under the reaction conditions. (c) 2006 Elsevier B.V. All rights reserved.</p>10aCo-HMS10aethylbenzene10aHMS10ahydrothermal10aOxidation1 aBhoware, Shrikant, S.1 aShylesh, S.1 aKamble, K., R.1 aSingh, A., P.  uhttps://library.ncl.res.in/content/cobalt-containing-hexagonal-mesoporous-molecular-sieves-co-hms-synthesis-characterization-001670nas a2200229   4500008004100000022001400041245010400055210006900159260005700228300001200285490000800297520087400305653002001179653000801199653001901207653001101226653000801237100002601245700001901271700001801290856013201308       2009                        eng d  a1011-372X00aCatalytic activity of cobalt containing MCM-41 and HMS in liquid phase oxidation of diphenylmethane0 aCatalytic activity of cobalt containing MCM41 and HMS in liquid   a233 SPRING ST, NEW YORK, NY 10013 USAbSPRINGERcNOV  a106-1110 v1333 a<p>Cobalt containing MCM-41 and HMS were synthesized by direct hydrothermal (DHT) and post synthesis methods (grafting and immobilization). The catalytic activity of these materials was investigated in the liquid phase oxidation of diphenylmethane at 80 A degrees C with TBHP (70 wt%) as oxidant. Comparative study of cobalt containing MCM-41 and HMS was carried out to reveal the catalytic performance of framework, extraframework and immobilized cobalt species. The role of the solvent in the performance of catalyst was examined with different polar and non polar solvents. Oxidation of diphenylmethane in solvent free media (under similar reaction conditions) shows formation of hydroxy derivatives of benzophenone in addition to main product (benzophenone). Hundred percent selectivity to benzophenone was obtained when the reaction was carried out in solvent.</p>10adiphenylmethane10aHMS10aImmobilization10aMCM-4110aXRD1 aBhoware, Shrikant, S.1 aKamble, K., R.1 aSingh, A., P.  uhttps://library.ncl.res.in/content/catalytic-activity-cobalt-containing-mcm-41-and-hms-liquid-phase-oxidation-diphenylmethane-0