通过浸渍法制备了一系列20Ni/xCe-TiO₂催化剂。考察了助剂Ce对于NiO/TiO₂催化剂甲烷化性能的影响，并对Ce助剂的最佳添加量进行了研究。对所制得催化剂进行了活性评价、还原条件测试、寿命测试，并利用SEM对其进行了表征。结果表明，添加助剂Ce可以增加催化剂的使用寿命，提高催化剂分散性，减小催化剂晶粒大小，增加反应活性区间，提高CH₄的选择性。通过对助剂Ce不同添加量的研究发现，20Ni/6Ce-TiO₂催化剂的活性较好，CO转化率可达88.8%，CH₄收率可达99.3%。对20Ni/6Ce-TiO₂催化剂还原条件的研究表明，在500℃ TPR还原条件下活性较优。

A series of 20 Ni/xCe-TiO₂ catalysts are prepared by the impregnation method.The effects of promoter Ce on the catalytic performance of 20 Ni/xCe-TiO₂ catalysts for CO methanation are studied.The optimal dosage of promoter Ce is detected.Evaluation of activity,detection of reduction conditions and service life test are carried out for the prepared catalysts,and SEM is used to characterize the catalysts.The results show that adding additives Ce can help the catalyst increase service life,improve dispersion,reduce grain size,increase the reaction activity zone and improve the CH₄ selectivity.The study on different dosage of promoter Ce shows that the activity of 20Ni/6Ce-TiO₂ catalyst is better,which can make CO conversion rate reach 88.8% and CH₄ yield reach 99.3%.The study on the reduction conditions of 20Ni/6Ce-TiO₂ shows that under the condition of TPR and 500℃,the catalyst has a better activity.

王煜炎(1992-),男,硕士研究生,研究方向为煤化工催化剂,519658945@qq.com