xAu/α-MnO2 Catalysts: Structure and Catalytic Oxidation of Benzene and Toluene

doi:10.7503/cjcu20120983

Abstract

Abstract:

α-MnO₂-supported gold catalysts(xAu/α-MnO₂, x=1.0%—7.0%, mass fraction) were prepared by deposition-precipitation method using NaOH as precipitation agent and characterized by X-ray diffraction(XRD), N₂ adsorption-desorption measurement, H₂ temperature-programmed reduction(TPR), Transmission electron microscopy(TEM) and X-ray photoelectron spectroscopy(XPS). Catalytic activities of the materials were evaluated for the oxidation of benzene and toluene. The sizes of Au particle and α-MnO₂ support were related with the Au loading over xAu/α-MnO₂ samples and increased with Au loading. The result of XPS showed that the molar ratios of O^2-/O₂^-, Mn⁴⁺/Mn³⁺ and Au³⁺/Au⁰ increase with adding of Au. It was shown that the loading of gold on α-MnO₂ could significantly modify the catalytic activities. The catalytic performance of xAu/α-MnO₂ strongly depended upon the Au loading, among which 3% Au/α-MnO₂ performed the best activity, T₁₀₀=280, 250 ℃ for the catalytic oxidation of benzene and toluene, respectively. The excellent performance of 3% Au/α-MnO₂ was associated with the highly dispersed Au, good low-temperature reducibility, and synergism at the interface of Au and MnO₂ nanodomains.

Key words: Au/α-MnO₂ catalyst, Reducibility, Synergism, Benzene, Toluene, Catalytic oxidation

CLC Number:

O643.32

TrendMD:

YE Qing, HUO Fei-Fei, WANG Hai-Ping, WANG Juan, WANG Dao. xAu/α-MnO₂ Catalysts: Structure and Catalytic Oxidation of Benzene and Toluene[J]. Chem. J. Chinese Universities, 2013, 34(5): 1187.

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xAu/α-MnO₂ Catalysts: Structure and Catalytic Oxidation of Benzene and Toluene

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