炭催化CH_4-CO_2重整制合成气的研究

Study of CH_4-CO_2 Reforming Syngas with Carbonaceous Catalyst

在石英固定床上进行炭催化CH4-CO2重整制合成气的研究,对反应前后炭催化剂的比表面积、孔容及孔径等作了分析。结果表明,在炭催化的条件下,CH4和CO2的初始转化率较高,然后逐渐降低至1个平稳的阶段。高温有利于CH4和CO2转化率的提高,同时也加速了CO2与炭催化剂之间的气化反应。空速对CH4和CO2转化率影响比较明显,空速越小,CH4与CO2转化率越高。CH4-CO2重整反应的最佳比例为1∶1。此种状况下CH4和CO2稳定时的转化率分别为27%和65%。炭催化剂的比表面积、孔容、孔径等在反应前后均没有明显变化,说明积碳对炭催化CH4-CO2重整反应没有影响。

A study of CH4-CO2 reforming synthetic gas with carbonaceous catalyst has been investigated on a fixed-bed quartz-tube reactor. The specific surface area, pore volume and pore size of carbonaceous catalyst before and after reaction have been studied. The results indicate that with carbonaceous catalyst the conversion of CH4-CO2 is high in the initial stage and then gradually falls down till constant. High temperature is favorable to enhancing the conversion of CH4 and CO2, and speeds up the gasification reaction between CO2 and carbonaceous catalyst. The airspeed has an obvious effect on the conversion of CH4 and CO2 ： the lower the airspeed, the higher the conversion. The optimal ratio of CH4 and CO2 in reforming reaction is 1：1. Under this condition, the conversion of CH4 and CO2 is 27 % and 65 % respectively, and there is no change in the specific surface area, pore volume and pore size of the carbonaceous catalyst before and after reaction. It indicates that carbon deposition has no effect on CH4-CO2 reforming reaction when catalyzed by carbonaceous catalyst.