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Abstract
Catalytic coal gasification is an efficient way to achieve high conversion rates at low temperatures. Catalyst loss due to the reaction between the inherent mineral matter in the coal and the catalyst is a major hurdle for its practical application. The problem may be overcome by removing the mineral matter from the coal before use. Two demineralizing approaches, acid-washing and solvent-extraction methods are investigated for demineralizing the coals. Elemental analysis, XRD analysis, NMR analysis, and N2 adsorption analysis were made to compare the demineralization efficiency, crystallographic carbon microstructure, chemical structure, and micro-porosity, respectively. Solvent-extraction method was found be more efficient for demineralization. Difference was observed in the chemical structure and micro-porosity while crystallographic carbon-microstructure was found to be similar. Non-catalytic and catalytic gasification reactivity of the chars obtained by the two methods was compared. Gas composition and gas evolution profiles were also obtained and found to be influenced by the degree of demineralization.
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