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

    摘要
  • 摘要: 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。

     

    Abstract: 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.

     

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