不同金属化合物催化呼和浩特煤加氢气化实验研究

Experimental study on Hohhot coal hydrogasification catalysed by different metal compounds

在加压固定床反应器上考察了K2CO3、Na2CO3、Ca(OH)2、Ni(NO3)2催化剂对呼和浩特煤加氢气化反应的催化效果,并考察了温度对催化剂效果的影响。实验结果表明,不同种类的金属化合物对气化反应的催化效果有明显影响,催化活性依次为K>Na>Ni>Ca。与原煤气化相比,在相同时间内达到相同碳转化率时,碱金属化合物K2CO3的加入使原煤加氢气化的气化温度降低150℃以上,碱金属化合物Na2CO3降低约150℃,过渡金属化合物Ni(NO3)2降低50℃以上,碱土金属化合物Ca(OH)2的加入会吸收一部分CO2产品,表观上反而降低了碳转化率。SEM及BET表征结果表明,煤样负载不同金属化合物催化剂后表面形态及孔结构有一定差异。

The catalysis of K2CO3, Na2CO3, Ca（OH）2 and Ni（NO3 ）2 on the hydrogasification of Hohhot coal was studied in a pressurized fixed-bed reactor, in which the effects of temperature were investigated. The experimental results show that different kinds of metal have a significant difference in the catalysis to the hydrogasification reaction, and the order of catalytic activity is as follows： K 〉 Na〉 Ni 〉 Ca. Compared with the non-catalytic coal hydrogasification, the temperature of hydrogasification catalysed by K2CO3 is dropped by more than 150 ℃ under the same carbon conversion at the same time and reduced about 150 ℃ by Na2CO3 and more than 50℃ by Ni （NO3 ）2. However, the adding of Ca （OH）2 even decreases the observed carbon conversion due to the sorption of Ca（OH） 2 for CO2 produced. The SEM and BET results show that coal samples loaded with different metal compounds catalysts have different surface morphologies and pore structures as well.