Abstract
Hydrogasification of Greek lignite impregnated with potassium salts and metal chlorides was studied isothermally, between 750 and 900 °C, in a fixed bed reactor, in correlation with the impregnation conditions (pH, molarity, temperature). Potassium carbonate favours light hydrocarbon formation. Lowering of pH of impregnation significantly decreases potassium chemisorption on the lignite matrix and is followed by a drastic decrease in methane production and carbon conversion during hydrogasification. Initial porosity and surface area decrease with catalyst impregnation and their development during hydrogasification is suppressed.
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