摘要
在NiC催化剂中分别添加了九种不同的金属组分,在加压和碘甲烷助剂的存在下考察了第二金属组分及含量对甲醇羰基化反应性能的影响。结果表明:分别添加Pd、Mo、La三种组分可不同程度地提高NiC催化剂的羰基化活性,其中以Pd的效果最佳,Ni和Pd之间存在着明显的相互作用。Pd含量为1%时,羰基化活性达到最高,甲醇转化率和醋酸收率分别为9240%和4973%。Ni-PdC双金属催化剂的活性中心主要为Ni0,还有少量Pd0存在,Pd能够显著促进NiO的还原。
A series of bimetallic catalysts were prepared by equivalent wetness impregnation, maintaining 5 0w% Ni content as constant The catalysts were characterized by means of XPS and TPR The activity of catalysts for vapor phase carbonylation of methanol was investigated under pressurized conditions in the presence of methyl iodide promoter It is revealed that the addition of Pd, Mo or La into Ni/C catalyst resulted in an increase in the activity of carbonylation In particular, Ni-Pd/C catalyst exhibited a significantly higher activity than Ni/C, while an increase in methane formation was also observed The influence of Pd content on methanol conversion and AcOH yield was also examined The optimum content of Pd was 1 0w% The promoting effect of Pd could be attributed to the synergistic effect between Ni and Pd which could promote the reduction of Ni as a result of stronger hydrogen spillover
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
1999年第4期323-327,共5页
Journal of Fuel Chemistry and Technology
基金
国家自 然科学基 金
关键词
甲醇
气相羰基化
乙酸
镍基
双金属催化刘
Ni-based bimetallic catalyst, methanol, vapor phase carbonylation, acetic acid