CH_4-CO_2催化重整制合成气Co-MgO/活性炭催化剂的制备及性能

Preparation and performance of Co-MgO/activated carbon catalyst for CO_2 reforming of CH_4 to produce syngas

利用固定床反应装置研究了催化剂Co/活性炭(AC)中引入助剂Mg O对甲烷二氧化碳重整制合成气催化剂性能的影响,并通过XRD、SEM和BET技术对催化剂进行了表征。结果表明,添加适量的助剂Mg O一方面与活性物质发生协同作用,提高催化剂的比表面积;另一方面可以调节催化剂的酸碱性,提高催化剂对CO2的吸附活化,从而促进甲烷的裂解脱氢。400℃焙烧条件下制备的催化剂Co-Mg O/AC表现出最佳的催化活性和稳定性,在900℃下连续运行1 200 min,甲烷和二氧化碳转化率分别维持在96.7%和97.0%左右。

The catalytic function of MgO-promoted Co/activated carbon （AC） on carbon dioxide reforming of methane to produce syngas in a fixed bed reactor is investigated. The catalyst is characterized by XRD, SEM and BET techniques. The results show that the introduction of a proper amount of MgO promoter can both increase the catalyst＇ s surface area by synergistic interaction with active components and enhance the adsorption of CO2 on the catalyst by regulating the surface acidity or basieity of catalyst, which contribute to the dehydrogenation of methane eventually. The reactive activity and stability of Co-MgO/AC obtained under calcination condition of 400℃ is the best. The conversion of methane and carbon dioxide are maintained at about 96.7% and 97.0%, respectively, after continuous operation at 900℃ for 1 200 minutes.