热处理对Ni/C催化剂上甲醇羰基化性能的影响  

INFLUENCE OF THERMAL TREATMENT ON THE PERFORMANCE OFMETHANOL CARBONYLATION OVER Ni/C CATALYST

作　　者：杨彩虹[1] 韩怡卓[1] 李文彬[1] 王定珠[1] 卢学栋[1] 

机构地区：[1]中国科学院山西煤炭化学研究所

出　　处：《催化学报》1999年第4期397-402,共6页

基　　金：国家自然科学基金

摘　　要：在惰性气氛中将Ｎｉ／Ｃ催化剂进行不同温度的热处理，采用ＸＰＳ，ＴＰＲ，ＢＥＴ和ＸＲＤ手段对其进行了表征．在加压和碘甲烷助催化剂的存在下考察了热处理温度和热处理次序对甲醇羰基化活性及醋酸收率的影响．结果表明，随着处理温度的升高，羰基化活性和产物收率明显提高，而热处理次序对反应性能影响甚微．热处理过程中活性炭促进了ＮｉＯ还原为金属Ｎｉ，使得镍活性中心的数目明显增加。The effects of thermal treatment in inert atmosphere on the properties of Ni/C catalyst were studied. The treated catalysts were characterized by means of XPS, TPR, BET and XRD. The activity of catalysts was tested by vapor phase carbonylation of methanol under pressurized conditions in the presence of methyl iodide. The results indicated that the activity of catalysts and the yield of products increased remarkably with increasing the thermal treatment temperature. The catalyst activity reached a maximum treated at 830. The sequence of heat treatment had little effect on the catalytic performance. After thermal treatment, it was observed that the surface area and pore volume of the catalysts obviously increased and the interaction between carbon support and Ni metal was stronger. It was found that the active carbon was able to reduce NiO to Ni when the catalysts were subjected to an inert atmosphere above 400.The high activity for carbonylation has been suggested to result from an increase in thenumber of active Ni sites and higher Ni dispersion.

关 键 词：甲醇 羰基化 醋酸 镍 活性炭 热处理 催化剂 

分 类 号：TQ225.122[化学工程—有机化工] O643.36[理学—物理化学]