Effects of O2/CH4 ratio on methane catalytic combustion over Cu/γ-Al2O3 particles

Rate measurements of methane catalytic combustion over copper catalyst were investigated in a fixed bed differential reactor with different pressure ratios of O2/CH4. Three kinetic regions were defined by the influence of pressure ratios of O2/CH4 on methane catalytic combustion. And surface reactio...

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Bibliographic Details
Published in:International journal of hydrogen energy 2016-10, Vol.41 (40), p.18282-18290
Main Authors: Geng, Haojie, Yang, Zhongqing, Zhang, Li, Ran, Jingyu, Yan, Yunfei, Guo, Mingnv
Format: Article
Language:English
Subjects:
Copper catalyst
Kinetics
Methane catalytic combustion
Reactants partial pressure
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Summary:Rate measurements of methane catalytic combustion over copper catalyst were investigated in a fixed bed differential reactor with different pressure ratios of O2/CH4. Three kinetic regions were defined by the influence of pressure ratios of O2/CH4 on methane catalytic combustion. And surface reaction mechanism, as well as kinetic characteristics, was also discussed. It was found that, when O2/CH4 > 2, methane reaction rate had a positive relationship with methane pressure, and the reaction parameters were: α=0.9, β=0, Ea=146.3 kJ/mol (α and β are reaction orders with respect to methane and oxygen, Ea is apparent activation energy). Coverage ratio of chemisorbed oxygen on catalyst surface approached a saturated state. When 0.1 
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2016.08.134