摘要
制备了不同La含量的Ni-La/γ-Al2O3·SiO2催化剂,采用XRD、TPR和XPS等对催化剂进行了表征,结果显示,催化剂中加入La之后,能提高Ni的分散度。分别考察了水醇比和温度对La质量分数为5%的催化剂性能的影响,发现当水醇摩尔比为4.0时,氢气选择性650℃时达到99.0%,CO选择性400℃时只有0.7%。还对该催化剂进行了稳定性测试,结果表明,在整个100h稳定性测试过程中不产生乙烯,氢气的选择性保持在67.2%左右,总积炭量仅仅为8.6mg/(gcat·h),具有良好的稳定性和抗积炭性能。
Ni-La/γ-Al2O3·SiO2 catalysts with different La contents were prepared,and the structure and surface characteristics of the catalyst were measured with XRD,TPR,and XPS. It was revealed that Ni was dispersed well in the catalyst by addition of La. The effects of water/ethanol ratio and reaction temperature on the catalytic performance of Ni-La/γ-Al2O3·SiO2 (5%La) catalyst were studied,and it was found that when water/ethanol molar ratio was 4.0,hydrogen selectivity over Ni-La/γ-Al2O3·SiO2 (5%La) increased to ...
出处
《化工进展》
EI
CAS
CSCD
北大核心
2008年第10期1605-1609,1623,共6页
Chemical Industry and Engineering Progress
