炭素の接触ガス化 (I)

高純度無定形炭素と水蒸気あるいは炭酸ガスとの反応におけるアルカリ金属触媒の化学状態

抄録

The steady gasification of the highly pure and amorphous carbon impregnated with the various alkali metal compounds was examined under steam or carbon dioxide atmosphere by means of thermogravimetry and gas analysis methods. As the result, the followings were obtained;
1) It was deduced that the alkali metal nitrate, nitrite and acetate loaded on carbon converted to the carbonate by the rapid reaction at the melting point of each compound.
2) From the gas analysis the sample impregnated with the hydroxide indicated no evidence for it to change to the carbonate under the pre-heat-treatment until 500°C.
3) The similarity of the catalytic behavior between the carbonate and hydroxide samples was comfirmed experimentally. Refering the literatures the following scheme was assumed for both the steam and carbon dioxide gasifications.
M compounds (carbonate, hydroxide) +C →activated carbon intermediate activated carbon intermediate + H₂O→M + CO + H₂or
activated carbon intermediate + CO₂ → M + 2CO