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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 15    No. 3    June 2005

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Preparation and characterization of La0.8Cu0.2MnO(3±δ) perovskite-type catalyst for methane combustion
HE Fang(何 方), WANG Hua(王 华),  DAI Yong-nian(戴永年)

Faculty of Materials and Metallurgical Engineering, 
Kunming University of Science and Technology, Kunming 650093, China

Abstract:La0.8Cu0.2MnO(3±δ) perovskite-type catalyst for methane combustion prepared through sol-gel process was characterized by X-ray Diffractometry(XRD), X-ray Photoelectron Spectroscopy(XPS) and Scanning Electron Microscopy(SEM). XPS analyses reveal that the surface characteristics of the catalyst are changed. The lattice defects and oxygen vacancies on the catalyst surface are enhanced due to a part of La3+ being substituted by Cu2+. Temperature-programmed-desorption(TPD) and temperature-programmed-reduction(TPR) analyses were carried out to study the catalytic behavior. It is found that there are two O2-desorption peaks at 350℃ and 650℃ in the TPD pattern, and two CH4-consumption peaks at 420℃ and 750℃ in the TPR patterns respectively, which indicates that the two kinds of oxygen species, so-called α and β oxygen, can react with the methane during catalytic combustion process. The catalytic activity tests were performed in a fixed-bed reactor, and the results show that the T1/2 at which the conversion of methane attains 50% of La0.8Cu0.2MnO(3±δ) is lower by 55℃ than that of LaMnO3. This indicates that the catalytic activity of La0.8Cu0.2MnO(3±δ) is increased with partial substitution of Cu2+ for La3+.

 

Key words: perovskite-type catalyst; methane catalytic combustion; sol-gel; TPD-TPR-MS characterization

ISSN 1672-7029
CN 43-1423/U

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