β Scribed by Akira Tomita; Takayuki Takarada; Yasukatsu Tamai
No coin nor oath required. For personal study only.
Shin-Yubari coal was impregnated with several catalysts of different chemical types during pulverization. The resultant system was more homogeneous and reactive than systems prepared by impregnation of coarse coal. The relative activities of the catalysts were determined as a function of gasification temperature, catalyst loading and gasifying agent. The activity sequence in steam was K > Ba > Ni > Fe > coal ash. Each catalyst had a unique reaction profile. For example, using steam the specific rate or the rate per remaining fixed-carbon weight decreased with time for the iron-catalysed reaction, whereas it increased for the potassium-catalysed reaction. A similar order of activity was observed in carbon dioxide, but a different sequence was noted for the hydrogenation reaction. Transition metal catalysts were the most active. The hydrogenation reaction profiles were different from the oxidation profiles.
π SIMILAR VOLUMES
After a reflection on the gasification-kinetics of alkali-doped coal the catalytic activities of Li, Na, K, Cs were compared. The behaviour of coke doped with alkali carbonate under inert atmosphere was also studied.