Effect of stoichiometric ratio of organic fuel to oxidizer on performance of La0.8Sr0.2CoO3 catalysts for CH4 combustion |
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| Authors: | Yuehui Wu Laitao Luo and Wei Liu |
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| Institution: | (1) Department of Materials Chemistry, Nanchang Hangkong University, 330063 Nanchang, People’s Republic of China;(2) Institute of Applied Chemistry, Nanchang University, 330069 Nanchang, People’s Republic of China |
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| Abstract: | Perovskite-type La0.8Sr0.2CoO3 mixed oxides were prepared by d,l-alanine solution combustion synthesis and used successfully in CH4 combustion as catalysts. These samples were characterized by means of XRD, FTIR, BET, and H2-TPR methods. The effects of stoichiometric ratio (φ) of organic fuel to oxidizer on the structure and catalytic activities
of the catalysts were studied. The results indicate that all La0.8Sr0.2CoO3 mixed oxides with different φ have perovskite structures. Their structures and catalytic activities vary along with the change of φ. The catalytic activity
of La0.8Sr0.2CoO3 mixed oxide with φ = 1.52 is the best among all the samples, whose T
50 and T
100 (the temperatures of methane conversions reaching 50 and 100%, respectively) are respectively 470 °C and 550 °C, which can
be explained in terms of the smaller of average crystal size, higher specific surface area, bigger lattice distortion, lower
activation energy, and higher mobility of chemically adsorbed oxygen on the surface and vacancy of the catalysts. |
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| Keywords: | Stoichiometric ratio organic fuel Oxidizer La0 8Sr0 2CoO3 Catalytic combustion of methane |
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