2O 3/Al 2O 3 and Fe 2O 3/SiO 2 Fabricated by Temperature-Regulated Chemical Vapour Deposition as Catalysts for Acetaldehyde Oxidation]]>

摘要

AbstractTemperature-regulated chemical vapour desorption was used for deposition of Fe2O3nanoparticles on the surface of mesoporous Al2O3and SiO2. The entire internal structure of mesoporous substrates, with a mean particle diameter of several hundred micrometres, was coated by Fe2O3nanoparticles 2O3/Al2O3had a smaller mean Fe2O3particle size with superior dispersion of Fe2O3nanoparticles, Fe2O3/SiO2showed a higher CO2evolution rate than Fe2O3/Al2O3. In combination with the results of acetaldehyde adsorption and desorption experiments, we suggest that acetaldehyde interacts more strongly with Al2O3than SiO2. This can reduce the collision frequency of acetaldehyde with catalytically active Fe2O3nanoparticles deposited on Al2O3, thereby reducing the total oxidation rate of acetaldehyde. We demonstrate that temperature regulated-chemical vapour deposition is a promising method for preparation of mesoporous substrate-based catalysts for efficient oxidation of volatile organic compounds with different mesoporous materials. Moreover, we show that interaction between supporting material surfaces and reactant molecules is a critical factor for determining activity in heterogeneous catalysis.Graphical Abstract

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