Gasification of coals treated with non-aqueous solvents. 6. Catalytic steam gasification at atmospheric pressure |
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Authors: | Akira Tomita Yoshiaki Oikawa Takaaki Kanai Yasukatsu Tamai |
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Affiliation: | Chemical Research Institute of Non-Aqueous Solutions, Tohoku University, Katahira, Sendai 980, Japan |
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Abstract: | Nickel-catalysed steam gasification was examined for two Japanese and three German coals which had been pretreated with liquid ammonia. Reaction temperatures range from 923 to 1123 K. The greatest enhancement in reactivity by ammonia treatment and 1 wt % nickel loading was observed for Leopold coal. With this treatment, the temperature could be lowered by about 55 K to achieve the same conversion level as the original coal. The apparent activation energy decreased from 220 to 140 J/mol. The crucible swelling number decreased from to 0. The surface of the char after gasification was examined by a scanning electron microscope. The role of the catalyst and the interaction of nickel with sulphur are discussed. |
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