Citation: YE Qing, HUO Fei-Fei, YAN Li-Na, WANG Juan, CHENG Shui-Yuan, KANG Tian-Fang. Highly Active Au/α-MnO₂ Catalysts for the Low-Temperature Oxidation of Carbon Monoxide and Benzene[J]. Acta Physico-Chimica Sinica, ;2011, 27(12): 2872-2880. doi: 10.3866/PKU.WHXB20112872 shu

Highly Active Au/α-MnO₂ Catalysts for the Low-Temperature Oxidation of Carbon Monoxide and Benzene

1.
College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, P. P. China

Received Date: 13 June 2011
Available Online: 29 September 2011
Fund Project: 国家自然科学基金(20777005) (20777005) 北京市自然科学基金(8082008) (8082008)北京市组织部优秀人才基金(20071D0501500210)资助项目 (20071D0501500210)

α-MnO₂-supported ld catalysts (xAu/α-MnO₂, x=0-7 (corresponding to the Au loading (mass fraction) of 0-7%) were prepared by a deposition- precipitation method using urea as a precipitation agent and characterized by different techniques such as X-ray diffraction (XRD), N₂ adsorption-desorption measurements, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and H₂ temperature-programmed reduction (TPR). The catalytic activities of the materials were evaluated for the oxidation of CO and benzene. The Au particle size was found to be related to the Au loading of the xAu/ α-MnO₂ samples and increased with Au loading. XPS results showed that the mole ratios of O^2-/(O₂^2- or O^-), Mn⁴⁺/Mn³⁺ and Au³⁺/Au⁰ increased upon the addition of Au. The loading of ld over α-MnO₂ significantly modified the catalytic activities. The catalytic performance of xAu/α-MnO₂ strongly depended on the Au loading, and 3Au/α-MnO₂ gained the best activity at T₉₀=80 °C and T₉₀=20 °C for the catalytic oxidation of CO and benzene, respectively. The excellent performance of 3Au/α-MnO₂ is associated with highly dispersed Au, od low-temperature reducibility, and a synergism at the interface between theAu and MnO₂ nanodomains.
- &,
- -MnO₂ supported ld catalyst,
- Low-temperature reducibility,
- Synergistic action,
- Carbon monoxide oxidation,
- Benzene combustion
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沈阳化工大学材料科学与工程学院沈阳 110142

Highly Active Au/α-MnO2 Catalysts for the Low-Temperature Oxidation of Carbon Monoxide and Benzene

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通讯作者: 陈斌, bchen63@163.com

Highly Active Au/α-MnO₂ Catalysts for the Low-Temperature Oxidation of Carbon Monoxide and Benzene