Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 20    No. 3    March 2010

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Catalytic performance and kinetics of Au/γ-Al2O3 catalysts for
low-temperature combustion of light alcohols
DENG Qian(邓 谦)1, LI Xiao-mei(李小梅)1, 2, PENG Zhen-shan(彭振山)1,
LONG Yun-fei(龙云飞)1, XIANG Long-ming(相龙明)2, CAI Tie-jun(蔡铁军)<

1. School of Chemistry and Chemical Engineering,
Key Laboratory of Theoretical Chemistry and Molecular Simulation, Ministry of Education,
Hunan University of Science and Technology, Xiangtan 411201, China;
2. Valiant Fine Chemicals Co. Ltd., Yantai 264006, China

Abstract:Au/γ-Al2O3 catalysts were prepared by deposition-precipitation method for the catalytic combustion of low concentration alcohol streams (methanol, ethanol, iso-propanol and n-propanol). The catalysts were characterized by X-ray photoelectron spectroscopy (XPS), X-ray diffractometry (XRD) and energy dispersive X-ray micro analysis (EDS) techniques. The XPS results showed that there was only Au0 on the surface of catalysts. The XRD patterns showed that Au was presumably highly dispersed over γ-Al2O3. The temperatures for complete conversion of methanol, ethanol, iso-propanol and n-propanol with concentration of 2.0 g/m3 were 60, 155, 170 and 137 ℃, respectively, but they were completely mineralized into CO2 and H2O at 60, 220, 260 and 217 ℃ respectively over the optimized catalyst. The activity of the catalyst was stable in 130 h. The kinetics for the catalytic methanol elimination followed quasi-first order reaction expressed as r=0.652 8c0+0.084 2. The value of apparent activation energy is 54.7 kJ/mol in the range of reaction temperature.

 

Key words: gold; supported catalyst; light alcohols; low-temperature catalytic combustion; kinetics

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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