Effectiveness of K2CO3 and Ni as catalysts in steam gasification |
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| Affiliation: | 1. Institut für Werkstoffwissenschaften, University of Erlangen-Nürnberg, Martensstr. 5, D-91058 Erlangen, Germany;2. Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Žižkova 22, CZ61662 Brno, Czech Republic;3. Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI 48824, USA;1. School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China;2. School of Resources and Environmental Engineering, Anshun University, Anshun 561000, China;3. School of Education Science, Anshun University, Anshun 561000, China;1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, P.O. Box 165, Taiyuan 030001, PR China;2. University of Chinese Academy of Sciences, Beijing 100049, PR China |
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| Abstract: | The catalytic steam gasification of 34 coals ranging from anthracite to peat was conducted in a thermobalance at 1023 K. When the difference in the reactivities of coals with and without catalyst is taken as a measure of the catalyst efficacy, that of K2CO3 was found to be extremely large and almost independent of coal rank. The effectiveness of Ni depends on the coal type to a great extent and it was very large for several low rank coals. SEM observation and EDAX analysis showed that the K2CO3 catalyst was finely dispersed over the char and such a good dispersion was common for all the coals examined. The dispersion state of Ni catalysts depends on the coal type, Ni catalysts were well dispersed over low rank coal chars which showed high reactivity in the Ni-catalysed gasification. |
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