甲醇羰基化制醋酸镍基双金属催化剂的研究

VAPOR PHASE CARBONYLATION OF METHANOL ON ACTIVE CARBON SUPPORTED Ni-BASED BIMETALLIC CATALYSTS

在ＮｉＣ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ＮｉＣ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９２４０％和４９７３％。Ｎｉ－ＰｄＣ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