用浸渍法制备了以Al2O3为载体、Ni为活性组分的Ni/Al2O3二氧化碳甲烷化催化剂,在等温固定床反应器中研究了在Ni/Al2O3催化剂作用下,高纯氯化氢中微量CO2甲烷化反应效果,并考察了温度、压力、氯化氢体积空速以及H2/CO2摩尔比对CO2转化率的影响,同时研究了催化剂活性、稳定性及其再生性能.结果表明,在温度为250℃、压力为4.0 MPa、氯化氢空速为100 h-1、H2/CO2摩尔比为500∶1条件下,CO2甲烷化反应效果最好,其转化率可达到90％左右,对于高纯氯化氢中微量CO2的脱除起到很好的效果；催化剂在温度高于300℃时,反应不久后会迅速失活；催化剂再生性能只能部分恢复到新鲜水平.%Carbon dioxide methanation catalyst Ni/Al2O3 was prepared by the impregnation method using Al2O3 as carrier and Ni as active component. The catalytic performance in the methanation of carbon dioxide in high purity hydrogen chloride was evaluated in an isothermal fixed-bed reactor. The influence of temperature, pressure, hydrogen chloride volume space velocity and molar ratio of hydrogen to carbon dioxide on the conversion of CO2 over the Ni/Al2O3 catalyst was investigated and the catalyst stability and regeneration performance of the catalyst were evaluated. The results showed that the methanation conversion of CO2 was about 90% under the optimal process condition as follows; temperature 250℃ , pressure 4. 0 Mpa, hydrogen chloride volume space velocity 100 h-1 and H2/CO2 molar ratio 500 :1, promising satisfactory removal of trace amount of CO2 from high purity hydrogen chloride. The catalyst would rapidly deactivate after the reaction when temperature was higher than 300℃ and catalyst regeneration could only partially restore catalyst activity.
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