Indexed by:Journal Article

Date of Publication:2014-03-01

Journal:JOURNAL OF ENERGY CHEMISTRY

Included Journals:Scopus、ISTIC、EI、SCIE

Volume:23

Issue:2

Page Number:201-206

ISSN:2095-4956

Key Words:methane; methanol to hydrocarbons; decomposition; hydrogenolysis; thermodynamic analysis

Abstract:The influence factors and paths of methane formation during methanol to hydrocarbons (MTH) reaction were studied experimentally and thermodynamically. The fixed-bed reaction results show that the formation of methane was favored by not only high temperature, but also high feed velocity, low pressure, as well as weak acid sites dominated on deactivated catalyst. The thermodynamic analysis results indicate that methane would be formed via the decomposition reactions of methanol and DME, and the hydrogenolysis reactions of methanol and DME. The decomposition reactions are thermal chemistry processes and easily occurred at high temperature. However, they are influenced by catalyst and reaction conditions through DME intermediate. By contrast, the hydrogenolysis reactions belong to catalytic processes. Parallel experiments suggest that, in real MTH reactions, the hydrogenolysis reactions should be mainly enabled by surface active H atom which might come from hydrogen transfer reactions such as aromatization. But H-2 will be involved if the catalyst has active components like NiO.