微波对制备异丁烷脱氢流化床催化剂的结构及组成影响研究  

Influence of microwave on structure and composition of fluidized bed catalyst for isobutane dehydrogenation

作　　者：王宗廷 周丽君 张军杰 梁祺 王凤英 王博 韩旭 

机构地区：[1]中国石油大学理学院,山东青岛266580

出　　处：《中国石油大学学报（自然科学版）》2015年第3期177-182,共6页Journal of China University of Petroleum(Edition of Natural Science)

摘　　要：采用微波技术制备并表征Cr-K/γ-Al2O3流化床催化剂,评价其催化异丁烷脱氢制异丁烯的性能,分析催化剂结构与催化性能的关系和微波作用机制。结果表明:与传统法制备的催化剂相比,微波制备法降低了催化剂中活性组分的晶粒度,活性组分的分散度增加;微波法制备的催化剂部分活性Cr6+物种占据了氧化铝载体表面及内部四配位体附近的空穴,可形成稳定的—Al—O—Cr—O—Al—结构;微波法制备的催化剂中,单个Cr6+物种及低聚体的Cr6+物种多于传统制备的催化剂,而这两种活性铬物种在异丁烷催化脱氢反应中起着非常重要的作用;采用微波技术可缩短催化剂制备时间,提高其活性、稳定性和耐磨性,延长催化剂寿命。The fluidized bed catalysts of Cr-K / γ-Al2O3 were prepared by microwave method and characterized. Also the catalytic activities for isobutane dehydrogenation were evaluated,through which the relationship between the structure and performance of the catalysts,as well as the mechanism of microwave effect were analyzed. It was found that the particle size of active constituent on catalyst surface is decreased by microwave method,and the dispersion of active constituent on the supporter is improved in contrast to the catalyst prepared by conventional method. The part active Cr6 ＋species occupies sites on / in A12O3 in close vicinity of tetrahedral27 Al in the catalyst prepared by microwave,forming the stable structure of-Al-O- Cr- O- Al-. Also in the catalyst prepared by microwave isolated Cr6 ＋,mono and polychromate species are more than those prepared by conventional method,which play a key role in the isobutane dehydrogenation. The microwave method can reduce the preparation time of catalyst,increase the activity,high thermal stability,as well as good abrasion resistance,which extends the catalyst life.

关 键 词：流化床催化剂 微波 制备 表征 异丁烷 脱氢 

分 类 号：O643.36[理学—物理化学]