不同工艺条件下耐硫甲烷化催化剂的反应活性研究

考察了钼基耐硫甲烷化催化剂在不同反应温度下的催化活性,结果表明反应温度在560℃附近时甲烷化活性最高。在此温度下研究了空速、原料气中H2S、H2O、CO2、CH4、H2/CO等浓度对反应活性的影响,结果表明,原料气中H2S含量的增加有利于提高催化剂的甲烷化反应活性;H2O的加入促进了水煤气变换反应的进行但抑制了甲烷化反应,因此CO转化率虽没有下降但甲烷化效率却有所降低;添加CH4对甲烷化反应没有明显影响,而添加CO2则明显抑制了甲烷的生成。结合催化剂表征结果进一步对各因素的影响机理进行了分析,这为耐硫甲烷化工艺条件优化及催化剂设计提供了重要依据。

Effect of Reaction Parameters on the Activity of Sulfur-Resistant Methanation Catalyst

In this study,catalytic activity of a Mo based sulfur-resistant methanation catalyst was investigated at different reaction temperatures and the optimum activity was achieved at 560 ℃.The effect of other factors such as space velocity and raw material composition of H2S,H2O,CO2,CH4,H2/CO on the methanation activity was studied.The methanation activity increased with the increase of H2S concentration.Addition of H2O promoted the water gas shift reaction but inhibited the methanation reactions,leading to decreased methanation efficiency.The presence of CH4 didn’t affect the methanation reaction while CO2 inhibited the formation of methane.The deactivation mechanism was discussed based on the above results and catalyst characterization results,which provide an important basis for the optimization of sulfur-resistant methanation process conditions and design of new catalysts.