Hydrogen Peroxide Synthesis: An Outlook beyond the Anthraquinone Process

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Heterogeneous catalysts obtained by grafting metallocene complexes onto mesoporous silica

Thomas Maschmeyer, Fernando González Rey, Gopinathan Sankar … (1995)

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Titanium-containing mesoporous molecular sieves for catalytic oxidation of aromatic compounds.

Kennedy M. Chibwe, Thomas J Pinnavaia, P T Tanev (1994)

Titanium silicalite is an effective molecular-sieve catalyst for the selective oxidation of alkanes, the hydroxylation of phenol and the epoxidation of alkenes in the presence of H2O2 (refs 1-3). The range of organic compounds that can be oxidized is greatly limited, however, by the relatively small pore size (about 0.6 nm) of the host framework. Large-pore (mesoporous) silica-based molecular sieves have been prepared recently by Kresge et al. and Kuroda et al.; the former used a templating approach in which the formation of an inorganic mesoporous structure is assisted by self-organization of surfactants, and the latter involved topochemical rearrangement of a layered silica precursor. Here we describe the use of the templating approach to synthesize mesoporous silica-based molecular sieves partly substituted with titanium--large-pore analogues of titanium silicalite. We find that these materials show selective catalytic activity towards the oxidation of 2,6-di-tert-butyl phenol to the corresponding quinone and the conversion of benzene to phenol.