Importance of hydrophobicity in the liquid phase oxidation catalyzed by titanosilicates
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In the oxidation of alkanes, Ti-beta catalysts synthesized by the dry gel conversion method show higher turnover number and H2O2 selectivity than the conventionally synthesized ones, which is ascribed to higher hydrophobicity of the former. Trimethylsilylation of mesoporous materials is effective in enhancing the activity through increasing hydrophobicity. It has been revealed that the hydrophobicity of the catalysts whether microporous or mesoporous is a crucial factor in their activity in the liquid-phase oxidation of hydrophobic reactants such as alkanes and simple alkenes using aqueous H2O2 solutions as oxidant.
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