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在热天平实验装置上,于600℃—750℃下考察了碳与水蒸汽在K_2CO_3、Na_2CO_3、CaCO_3三种催化剂存在下的气化反应,并对气化速率、转化率、气体组成与反应温度及气化时间的关系进行了研究。实验结果表明,采用催化气化方法,不但可以大大提高气化速率,降低反应温度,而且可以降低煤气中的CO含量。在本实验条件下,上述三种催化剂的活性顺序与文献报导不同,为:Na_2CO_3≥K_2CO_3>CaC_3。而CaCO_3在反应中表现出与钾、钠碳酸盐不同的催化特性。最后,根据实验结果对催化气化之反应机理进行了探讨。认为其反应历程为:
The gasification reaction of carbon and steam in the presence of K_2CO_3, Na_2CO_3 and CaCO_3 catalysts was investigated at 600 ℃ -750 ℃ on the thermobalance system. The gasification rate, conversion, gas composition and reaction temperature And the relationship between gasification time has been studied. The experimental results show that the catalytic gasification method not only can greatly increase the gasification rate, lower the reaction temperature, but also can reduce the CO content in the gas. Under the experimental conditions, the order of activity of the above three catalysts is different from that reported in the literature: Na 2 CO 3> K 2 CO 3> CaC 3. However, CaCO 3 showed different catalytic properties from potassium and sodium carbonate in the reaction. Finally, the reaction mechanism of catalytic gasification is discussed based on the experimental results. Think its reaction course is: