Gasification of coals treated with non-aqueous solvents. 2. Effect of liquid-ammonia treatment on gasification with hydrogen

Abstract

Japanese bituminous coals, treated with liquid ammonia and impregnated with nickel, were gasified with hydrogen at ambient pressure. The rates of gasification of the treated coals were larger than those of untreated ones by 2 to 8 times at 1273 K. A repeated treatment with liquid ammonia enhanced the reactivity further, but a third (or more) treatment was not so effective. Pretreatment with ethylene diamine, butylamine, pyridine, or sulphur dioxide caused a similar promotion of the gasification, while that with benzene, dimethyl formamide, or propane was less effective. Liquid-ammonia-treated coals seem to reduce or lose their agglomerating ability and thus to maintain higher gasification rates.