炭担体结构和表面改性对镍催化甲醇气相羰基化的影响

Influences of the texture and the surface modification of carbon supports on the nickelcatalyzed vapor phase carbonylation of methanol

考察了各种炭担体的结构和表面改性对甲醇气相羰基化的影响。利用ＢＥＴ、碱滴定、ＸＰＳ、ＴＧ、ＸＲＤ等方法对担体和催化剂进行了表征。比较了不同催化剂活性随时间的变化。结果表明，羰基化活性与担体表面积无一定关系，与孔结构关系密切。氧化碳负载的催化剂，Ｎｉ还原受到抑制，诱导期较长，但活性稳定性较好，还原碳负载的催化剂则与之相反。

Influrences of the texture of different carbon supports and their surface modification by oxidation with HNO3 or defunctionalization with H2 on the vapor phase methanol carbonylation were studied. The supports and catalysts were characterized by BET, NaOH titration, XPS, TG and XRD. The activities of the catalysts and their dependence on run time were compared. The carbonylation activity depends closely on porous texture but not on BET surface variation of the carbon supports used. Catalysts supported on oxidized carbons have shown a retardation of reduction, longer induction period and better stability compared with those supported on the defunctionalized ones.