Abstract

The catalytic effects of alkali, alkaline earth and transition metals on pyrolysis of lignite and bituminous coals were investigated using TG-FTIR. The results indicate that the orders of catalytic effects on the pyrolysis of lignite and bituminous coals are Ni ~ Fe ~ Ca ~ K and Ca ~ Fe > Ni > K, respectively. The maximal increments of conversion for the lignite and the bituminous coal are 10.1% and 6.4% with catalysts loaded. The CH4 yield of the bituminous coal is larger than that of the lignite. The increase in yield of CO 2, H 2O, CH 4, and CO is dependent on the catalysts, which are closely related to the temperature region and coal ranks.

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