Abstract: 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.

Key words: high purity hydrogen chloride, methanation of carbon dioxide, nickel/alumina catalyst

摘要： 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。

关键词: 高纯氯化氢, 二氧化碳甲烷化, 镍/氧化铝催化剂