Au/γ-MnO2 catalyst for solvent-free toluene oxidation with oxygen

doi:10.1016/S1872-2067(12)60633-0

Abstract

Abstract:

α-, δ-, and γ-MnO₂ were synthesized by a redox method and Au/γ-MnO₂catalysts with different Au loadings (0.5%-3.0%) were synthesized by an in situ reduction method. The supports and catalysts were characterized by X-ray diffraction, scanning electron microscope, transmission electron microscopy (TEM), and N₂ adsorption. TEM images showed that the Au particles were about 10 nm. The catalysts were used in solvent-free toluene oxidation with oxygen. The results showed that toluene conversion increased with increasing Au loading, which was ascribed to the increasing amount of Au particles and also the smaller Au particles. The Au loading gave a uniquely high selectivity to benzaldehyde. The Au/γ-MnO₂ catalysts exhibited good reusability in liquid phase toluene oxidation.

Key words: Manganese dioxide, Nano-gold catalyst, Toluene oxidation, Solvent-free

Feng Jiang, Xiaowen Zhu, Baosong Fu, Jinjin Huang, Guomin Xiao. Au/γ-MnO₂ catalyst for solvent-free toluene oxidation with oxygen[J]. Chinese Journal of Catalysis, 2013, 34(9): 1683-1689.

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Au/γ-MnO₂ catalyst for solvent-free toluene oxidation with oxygen

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