Non-oxidative Aromatization of Methane by Using Propane as Co-reactant over Mo-Zn/HZSM-5 Catalyst

Abstract

Abstract: The non-oxidative conversion of methane(C₁) into aromatic hydrocarbons by using propane(C₃) as co-reactant over x%Mo+6%Zn/HZSM-5 catalysts was studied. C₁ conversion was very high, reaching 29%₃5%. Selectivity of aromatic products reaches above 80% at 873 K and GHSV=3 L/(g·h) with n(C₁)/n(C₃)=1.0. The excellent conversion of C₁(34.8%) was obtained over 0.7%Mo+6%Zn/HZSM-5 catalyst at 873 K and n(C₁)/n(C₃)=1.0. The effects of time-on-stream and n(C₁)/n(C₃) on C₁ and C₃ conversion and the products distribution were analyzed in order to obtain information about C₁ incorporation into the aromatic products and the evolution of different species. C₁ incorporation was conclusively confirmed by the mass spectral analyses of aromatic products produced in a run with 13^CH₄, which shows a significant 13^C enrichment in the C₆H₆⁺, C₇H₈⁺ and C₈H₁₀⁺ fragments. The methane activation could result from its hydrogen-transfer reaction with alkenes. This process was hoped to provide a novel route for the chemical utilization of natural gas and refinery gas.

Key words: Methane, Propane, Co-activation, Non-oxidative aromatization, Mo-Zn/HZSM-5 catalyst

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ZHENG Hai-Tao, LOU Hui, LI Ying-Hui, FEI Jin-Hua, HOU Zhao-Yin, XU Yan, WAN Shu-Bao, WANG Si-Han, ZHENG Xiao-Ming . Non-oxidative Aromatization of Methane by Using Propane as Co-reactant over Mo-Zn/HZSM-5 Catalyst[J]. Chem. J. Chinese Universities, 2005, 26(2): 285.

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Non-oxidative Aromatization of Methane by Using Propane as Co-reactant over Mo-Zn/HZSM-5 Catalyst

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