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Received December 21, 2004
Accepted March 30, 2005
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Raney Ni Catalysts Derived from Different Alloy Precursors Part II. CO and CO2 Methanation Activity
Division of Chemical Engineering, Pukyong National University, Busan 608-739, Korea
gdlee@pknu.ac.kr
Korean Journal of Chemical Engineering, July 2005, 22(4), 541-546(6), 10.1007/BF02706639
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Abstract
Catalytic activity, in conjunction with reaction mechanism, was studied in the methanation of CO and CO2 on three Raney Ni catalysts derived from different Ni-Al alloys using different leaching conditions. Main products were CH4 and CO2 in CO methanation, and CH4 and CO in CO2 methanation. Any other hydrocarbon products were not observed. Over all catalysts, CO methanation showed lower selectivity to methane and higher activation energy than CO2 methanation. The catalyst derived from alloy having higher Ni content using more severe leaching conditions, namely higher reaction temperature and longer extraction time, showed higher specific activity and higher selectivity to methane both in CO and CO2 methanation. In CO and CO2 methanation on Raney Ni catalyst, catalytic activity was seen to have close relation with the activity to dissociate CO.
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References
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VanHo S, Harriot P, J. Catal., 64, 272 (1980)
Wainwright MS, Anderson RB, J. Catal., 64, 124 (1980)
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Yesgar PW, Sheintuch M, J. Catal., 127, 576 (1991)
