Abstract
Alkali metals have been shown to be the most promising catalysts of water vapour gasification of carbon or coke (1,2). The advantages in comparison with other catalysts like iron or earth alkali metals are low temperature activity and selectivity for carbon monoxide methanation and the shift reaction. The most impressive example represents the potassium catalyzed coal gasification process of Exxon, which makes use of all these catalyst properties (3,4). However, it is also known, that the excellent low temperature activity is only achieved with such potassium salts like potassium hydroxide or potassium carbonate, which under in situ conditions of gasification are easily forming the K-0 complex as catalytic active species.
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