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Selective Dehydroaromatization of Methane toward Benzene on Re/HZSM-5 Catalysts and Effects of CO/CO2 Addition

Authors
Journal
Journal of Catalysis
0021-9517
Publisher
Elsevier
Publication Date
Volume
190
Issue
2
Identifiers
DOI: 10.1006/jcat.1999.2748
Keywords
  • Dehydrocondensation
  • Methane With Co/Co2
  • Re/Hzsm-5
  • Benzene

Abstract

Abstract The novel rhenium catalyst Re/HZSM-5 was studied for the catalytic performance of methane dehydrocondensation at 3 atm and 873–1023 K. It was found that C2 hydrocarbons and aromatic compounds such as benzene and naphthalene were catalytically obtained with a considerable evolution of hydrogen. High methane conversion (8–12%) and rates of benzene formation obtained on the Re/HZSM-5 catalyst were similar, under the experimental conditions used, to that on Mo/HZSM-5, which has been thought to be a unique catalyst for the reaction. In contrast to the molybdenum carbide (Mo2C) as the active phase for the reaction on Mo/HZSM-5, EXAFS and TG/DTA/mass studies suggest that the metallic Re on HZSM-5 is responsible for the catalytic dehydrocondensation of methane toward C2 hydrocarbons, benzene, and naphthalene. High and stable conversion of methane and high selectivities (70–87% based on carbon) of C2 hydrocarbons and benzene have been attained in the catalytic dehydrocondensation of methane on Re/HZSM-5 with CO/CO2 added in methane feed.

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