Citation: CHEN Yong-Dong, WANG Lei, TANG Shui-Hua, CAO Hong-Yan, NG Mao-Chu, CHEN Yao-Qiang. Effect of Ce_0.45Zr_0.45Y_0.07La_0.03O_1.95/La-Ba-Al₂O₃ Mass Ratio on the Activity of Fe-Based Monolithic Catalysts for the Combustion of Thin Methane[J]. Acta Physico-Chimica Sinica, ;2012, 28(05): 1237-1242. doi: 10.3866/PKU.WHXB201203141 shu

Effect of Ce_0.45Zr_0.45Y_0.07La_0.03O_1.95/La-Ba-Al₂O₃ Mass Ratio on the Activity of Fe-Based Monolithic Catalysts for the Combustion of Thin Methane

1.
1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, P. R. China;
2. Sichuan Zhongzi Exhaust Purge Co., Ltd., Chengdu 610225, P. R. China;
3. Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China

Received Date: 25 November 2011
Available Online: 14 March 2012
Fund Project: 国家自然科学基金(21173153) (21173153)绿色催化四川省高校重点实验室开放课题基金(LYY1101)资助项目 (LYY1101)

Ce_0.45Zr_0.45Y_0.07La_0.03O_1.95, an oxygen storage material (OSM), and La-Ba-Al₂O₃ have been prepared by co-precipitation and peptization, respectively, to be used as supports for Fe₂O₃ catalysts. The Fe₂O₃ catalysts were obtained by impregnation methods and then coated on the monolith. The catalytic combustion of low concentration (thin) methane was investigated over the prepared catalysts. The effect of the OSM/La-Ba-Al₂O₃ mass ratio on the physicochemical properties of the catalysts was investigated using nitrogen adsorption-desorption, oxygen storage capacity (OSC) measurements, X-ray diffraction (XRD), and H₂-temperature-programmed reduction (H₂-TPR). The highest catalytic activity of both fresh and aged Fe₂O₃ catalysts for thin methane combustion was observed when the mass ratio of OSM/La-Ba-Al₂O₃ was 1:1. At this OSM/La-Ba-Al₂O₃ mass ratio, methane started to convert at 446 °C and completely converted at 553 ° C, with 1% (volume fraction) CH4 and a gas hourly space velocity (GHSV) of 50000 h^-1. The Fe-based monolithic catalysts with different mass ratios of OSM to La-Ba-Al₂O₃ had different specific surface areas and reducibilities. XRD results showed that OSM existed in uniform solid solution and Fe₂O₃ was well dispersed on the binary supports. Based on the characterizations, the high catalytic activity and thermal stability of the catalysts can be attributed to the proper coordination of OSM and La-Ba-Al₂O₃ for thin methane combustion.
- Fe₂O₃ based monolithic catalyst,
- OSM/La-Ba-Al₂O₃ mass ratio,
- Catalytic combustion of thin methane
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Effect of Ce0.45Zr0.45Y0.07La0.03O1.95/La-Ba-Al2O3 Mass Ratio on the Activity of Fe-Based Monolithic Catalysts for the Combustion of Thin Methane

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通讯作者: 陈斌, bchen63@163.com

Effect of Ce_0.45Zr_0.45Y_0.07La_0.03O_1.95/La-Ba-Al₂O₃ Mass Ratio on the Activity of Fe-Based Monolithic Catalysts for the Combustion of Thin Methane