%0 Journal Article %J Journal of Molecular Catalysis A-Chemical %D 2013 %T Hydroxylation of phenol with hydrogen peroxide catalyzed by Ti-SBA-12 and Ti-SBA-16 %A Kumar, Anuj %A Srinivas, Darbha %K Catalytic liquid-phase hydroxylation of phenol %K Molecular sieves %K Ordered mesoporous titanosilicates %K Oxidation with hydrogen peroxide %K Ti-SBA-12 %K Ti-SBA-16 %X

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.

%B Journal of Molecular Catalysis A-Chemical %I ELSEVIER SCIENCE BV %C PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS %V 368 %P 112-118 %8 MAR %G eng %3 Foreign %4 3.679 %R 10.1016/j.molcata.2012.11.026