01819nas a2200229   4500008004100000022001400041245008800055210006900143260007300212300001200285490000800297520095700305653005101262653002101313653003901334653003701373653001401410653001401424100001601438700002101454856011401475       2013                        eng d  a1381-116900aHydroxylation of phenol with hydrogen peroxide catalyzed by Ti-SBA-12 and Ti-SBA-160 aHydroxylation of phenol with hydrogen peroxide catalyzed by TiSB  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcMAR  a112-1180 v3683 a<p>We report here, for the first time, the application of ordered, three-dimensional, mesoporous titanosilicates, Ti-SBA-12 and Ti-SBA-16, as reusable solid catalysts, for hydroxylation of phenol, an industrially important organic transformation. The reactions were conducted using 30% aqueous H2O2 as oxidant. The catalysts of this work are more efficient than the hitherto known mesoporous Ti-silicates. They are more para-product selective than TS-1 and other titanosilicates. Ti-SBA-12 exhibited higher activity and hydroquinone/catechol selectivity (by nearly two times) than Ti-SBA-16. H2O2 efficiency of similar to 90 mol% was obtained. Our study reveals that framework substituted Ti with pseudo-tetrahedral geometry, three-dimensional mesoporosity as well as surface structure are the unique features responsible for the high catalytic activity and selectivity of these titanosilicate catalysts. (C) 2012 Elsevier B.V. All rights reserved.</p>10aCatalytic liquid-phase hydroxylation of phenol10aMolecular sieves10aOrdered mesoporous titanosilicates10aOxidation with hydrogen peroxide10aTi-SBA-1210aTi-SBA-161 aKumar, Anuj1 aSrinivas, Darbha  uhttps://library.ncl.res.in/content/hydroxylation-phenol-hydrogen-peroxide-catalyzed-ti-sba-12-and-ti-sba-16-0