摘要
制备非Mo基的CeO_2-ZrO_2催化剂,在固定床反应器于650℃,3MPa,GHSV=5000h^(-1),V(H_2)/V(CO)=1.0且含有体积分数为0.6%的H_2S的合成气中考察催化剂制备方法、成分比例和热稳定添加剂(La、Mg、Y)对其高温耐硫甲烷化性能的影响。采用N_2物理吸附、H_2程序升温还原、X射线衍射对催化剂进行了表征。结果表明,共沉淀法制备的催化剂(CeO_2-ZrO_2)比浸渍法制备的催化剂(CeO_2/ZrO_2)的高温甲烷化活性高,稳定性好。XRD表征发现,共沉淀法制备的CeO_2-ZrO_2催化剂能形成类合金。共沉淀过程中添加La助剂有利于提高催化剂的热稳定性。
The non-Mo-based catalysts--modified CeO2-ZrO2 were prepared, and the effects of preparation methods, proportions of components and thermal stability additives （La, Mg, Y） on the performances of the catalysts for high temperature sulfur-resistant methanationin were investigated in a fixed-bed reactor under the reaction conditions of 650℃, 3MPa, GHSV of 5000h^-1 and the syngas with the HE/CO volume ratio of 1.0 and containing H2S of 0.6% by volume. The results indicate that the catalysts prepared by co-precipitation （CeO2-ZrO2） have better activity and stability than the catalysts prepared by impregnation （CeOE/ZrO2） during the methanation reaction at high temperature. XRD results show that the co-precipitated CeO2-ZrO2 catalysts can form metal alloy. In the process of co-precipitation adding La additive can improve the thermal stability of the catalyst.
出处
《天然气化工—C1化学与化工》
CSCD
北大核心
2017年第2期9-14,共6页
Natural Gas Chemical Industry
关键词
甲烷化
非钼基催化剂
高温
耐硫
二氧化铈
二氧化锆
methanation
non-Mo-based catalyst
high temperature
sulfur tolerance
CeO2
ZrO2
