研究了以焦炉煤气为原料在BaCo_(0.7)Fe_(0.2)Nb_(0.1)O_(3-δ)(BCFNO)透氧膜反应器中制合成气.实验结果表明,BCFNO膜反应器的自催化性能差.加入催化剂后,膜反应器的重整性能得到明显提高,在875℃,焦炉煤气中甲烷转化率为87.0%,产物中氢气和一氧化碳选择性分别为78.3%、105.6%,透氧量达到15.8ml/(cm~2·min).焦炉煤气中的甲烷在膜反应器中反应路径为首先焦炉煤气中的氢气与膜片透过去的氧反应生成水,然后甲烷再与水重整生成氢气和一氧化碳.实验过程中,透氧膜没有出现破裂,BCFNO透氧膜反应器在富氢的焦炉煤气下显示出很好的稳定性.
Syngas from coke oven gas was investigated in an oxygen-permeable membrane BaCo_(0.7)Fe_(0.2)Nb_(0.1)O_(3-δ) (BCFNO) reactor.It was found that the membrane itself has poor catalytic activity methane.After the catalyst was packed on the membrane surface,both methane conversion and oxygen permeation flux were greatly improved by the synergetic effect between the membrane and catalyst,at 875℃,87.0% of methane conversion,78.3% of H_2 selectivity,105.6% of CO selectivity and as high as 15.8ml/(cm~2·min) of oxygen permeation flux were obtained.The react pathway of CH_4 in the coke oven gas in the membrane reactor is as follows: firstly,H_2 in the coke oven gas reacts with the O_2,and generate H_2O,then CH_4 reforms with the H_2O to produce H_2 and CO.The membrane reactor exhibited not only good activity but also chemical stability resistance to hydrogen-enriched COG atmosphere.
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