Effects of CO[sub 2] during oxidative coupling of methane over Li/MgO: Mechanisms and models

Journal Article · Tue Feb 01 04:00:00 EST 1994 · Industrial and Engineering Chemistry Research; (United States)

DOI:https://doi.org/10.1021/ie00026a012· OSTI ID:7066575

Al-Zahrani, S; Song, Qi; Lobban, L L ^[1]

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1. Univ. of Oklahoma, Norman, OK (United States). School of Chemical Engineering and Materials Science

The effects of CO[sub 2] partial pressure on oxidative methane coupling over a Li/MgO catalyst were studied under low conversion conditions in a flow reactor. Methane to oxygen ratios from 0.5 to 35 and temperatures from 973 to 1073 K were used in the experiments and modeling. Varying flow rates of CO[sub 2] were mixed with the methane and oxygen prior to the reaction. Results indicate that CO[sub 2] has a poisoning effect on both carbon oxides (CO and CO[sub 2]) and C[sub 2] hydrocarbon (C[sub 2]H[sub 4] and C[sub 2]H[sub 6]) formation rates, while selectivity to the C[sub 2] hydrocarbon was not significantly affected. The apparent activation energy increased with CO[sub 2] partial pressure in the feed. Results also indicate that a small amount of methane reacts with carbon dioxide to produce carbon monoxide. Empirical rate expressions and rate expressions rigorously derived from proposed mechanisms were obtained. The rate expressions agree well with the measured rates and also predict the observed trend in apparent activation energy.

• OSTI ID: 7066575
• Journal Information: Industrial and Engineering Chemistry Research; (United States), Journal Name: Industrial and Engineering Chemistry Research; (United States) Vol. 33:2; ISSN IECRED; ISSN 0888-5885
• Country of Publication: United States
• Language: English

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