Abstract
This paper presents results on the pretreatment of coal with calcite (CaCO/sub 3/) and lime (CaO). These minerals have already been shown to influence fluidized-bed pyrolysis, steam gasification, and CO/sub 2/ gasification of coal. Addition of CaCO/sub 3/ or CaO to coal reduces the high temperature yield of hydrocarbon products and increases the yield of CO in rapid coal pyrolysis. The former effect is probably attributable to lime-catalyzed secondary cracking reactions, while the latter results from base catalysis of a step in the decomposition of the phenolic groups. Calcite in the presence of coal decomposes to lime and CO/sub 2/ at lower temperatures than it will when pyrolyzed alone.
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