苯催化加氢制环己烯Ru系催化剂共沉淀法的制备

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摘要

采用共沉淀法，选取Ru作为催化剂活性组分，Zn或与金属M作为催化剂助剂，在醇-水体系中制备了无负载的单助剂Ru系催化剂(Ru-Zn)和双助剂Ru系催化剂(Ru-Zn-M)。对所制催化剂和工业用Ru-Zn催化剂在相同实验条件下进行了活性评价、表征和对比。结果表明，制备出的单助剂Ru-Zn催化剂效果优于双助剂Ru系催化剂，且接近工业催化剂的催化效果；在苯转化率为74.1%时，环己烯选择性为65.6%，环己烯收率为48.6%；共沉淀法制备催化剂的过程中，添加乙醇作为分散剂，作用是有助于维持反应体系pH值的稳定等，从结果上会提高催化剂活性；还原过程中离子液体的添加起到了一定缓冲效果，使催化剂得到适度还原；催化剂中部分Zn的溶去有助于催化剂形成一定的孔结构，提高了其活性和选择性。

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	闫皙

关键词 ：苯加氢, 环己烯, Ru系催化剂, 共沉淀法, 表征

Abstract：

Carrier free ruthenium catalysts of single agent (Ru-Zn) and double agent (Ru-Zn-M) were prepared using co-precipitation method with Ru as active constituent and Zn or metal M as promoter. Both homemade catalysts and industrial catalyst were experimented under the same conditions in order to conduct the activity evaluation, characterization and comparison of the catalysts. The results show that the effect of homemade ruthenium catalysts of single agent is better than double agent and close to industrial catalyst； the cyclohexene selectivity was 65.6% and the cyclohexene yield reached 48.6% when the benzene conversion was 74.1%; ethanol was added as dispersant in the process of catalyst preparation using co-precipitation method in order to maintain the pH value of the reactionand so on, and improve the catalyst activity in the result of the experiment; the addition of ionic liquid in the process of reduction has buffer effect that the catalyst could get a modest reduction; the partial dissolution of Zn in catalyst contributed to form a certain pore structure of catalyst, which improved the activity and selectivity.

Key words： hydrogenation of benzene cyclohexene ruthenium catalysts co-precipitation characterization

作者简介: 闫皙（1987—），男，河北石家庄人，工程师。E-mail：yanxiway@163.com

引用本文:

闫皙. 苯催化加氢制环己烯Ru系催化剂共沉淀法的制备[J]. 煤炭与化工, 2017, 40(3): 86-90. Yan Xi. Catalytic hydrogenation of benzene to cyclohexene over ruthenium catalysts made by co-precipitation method. CCI, 2017, 40(3): 86-90.

链接本文:

http://www.mtyhg.com.cn/CN/ 或 http://www.mtyhg.com.cn/CN/Y2017/V40/I3/86

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