Methane dehydrogenation and aromatization over 4 wt% Mn/HZSM-5 in the absence of an oxidant |
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Authors: | P. L. Tan C. T. Au S. Y. Lai |
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Affiliation: | (1) Department of Chemistry and Centre for Surface Analysis and Research, Hong Kong Baptist University, Kowloon Tong, Hong Kong;(2) School of Chemical Engineering, Wuhan University of Technology, Wuhan city, Hubei, 430070, P.R. China |
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Abstract: | Methane dehydrogenation and aromatization over 4 wt% Mn/HZSM-5 in the absence of an oxidant (GHSV = 1600 mL h−1 g−1) was investigated. Mn/HZSM-5 was prepared by impregnation of HZSM-5 with manganese acetate tetrahydrate solution; Mn3O4 formed was the precursor of active phase for methane activation. The induction period over Mn/HZSM-5 catalyst before aromatic products appear was long at 700 °C. This period shortened with a rise of the reaction temperature to 800 °C. XPS and TPO results showed that the partly carburized or carburized Mn species formed are probably responsible for methane activation. |
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Keywords: | methane aromatization Mn/HZSM-5 active phase |
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