Chapter 16
Low-Temperature C H Decomposition on High-Surface Area Carbon Supported Co Catalysts Downloaded by SUNY STONY BROOK on February 9, 2015 | http://pubs.acs.org Publication Date: January 24, 2002 | doi: 10.1021/bk-2002-0809.ch016
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Z.-G. Zhang, K. Haraguchi, and T. Yoshida Hokkaido National Industrial Research Institute, 2-17 Tsukisamu-Higashi, Toyohira-ku, Sapporo 062-8517, Japan
High surface area carbon supported Co catalysts with loading up to 35wt% were prepared for converting CH4 to C2 hydrocarbons with the two-step reaction sequence. The catalysts were characterized by N2 adsorption, XRD analysis, TPR and TPD techniques. The activity of the catalysts in the CH4 decomposition was examined in a temperatures range of 300-450°C, while the subsequent hydrogenation in the second step was conducted at 100°C. It was found that the carbon supported catalysts provided higher Co dispersions than SiO2 supported one, and therefore exhibited higher CH4 decomposition activities. Moreover, the molar ratio of produced H2 to consumed CH4 in the decomposition indicated that CHx formed at lower temperatures tended to contain more hydrogen. The production of C2 in the hydrogenation step provided further evidence for the CHx formation in the decomposition and exhibited potential of the carbon supported catalysts to be used in the two-step CH4 reaction. +
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© 2002 American Chemical Society
In CO2 Conversion and Utilization; Song, C., et al.; ACS Symposium Series; American Chemical Society: Washington, DC, 2002.
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Introduction Increasing attention has been paid recently to the two-step reaction of CH4 to produce higher hydrocarbons (C2 ). In this reaction, CH4 is first activated on suitable metal catalysts at mild temperatures (
