Titanium-containing mesoporous molecular sieves for catalytic oxidation of aromatic compounds.
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.
Tanev
P T
PT
Department of Chemistry, Michigan State University, East Lansing 48824.
Chibwe
M
M
Pinnavaia
T J
TJ
D000588:Amines / Q000737:chemistry; D002384:Catalysis; D018360:Crystallography, X-Ray; D006838:Hydrocarbons / Q000737:chemistry*; D010084:Oxidation-Reduction; D012822:Silicon Dioxide / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*
D000588:Amines; D006838:Hydrocarbons; D012822:Silicon Dioxide; D014025:Titanium; C003935:dodecylamine