化工进展

• 工业催化 • 上一篇    下一篇

Co2+离子交换NaX分子筛催化苯乙烯环氧化

张 旭,许茂东,李兴扬,李 芳   

  1. (安徽工程大学生物与化学工程学院,安徽 芜湖 241000)
  • 出版日期:2011-03-05 发布日期:2011-03-05

Epoxidation of styrene catalyzed by Co2+- exchanged NaX zeolite

ZHANG Xu,XU Maodong,LI Xingyang,LI Fang   

  1. (School of Biological and Chemical Engineering,Anhui Polytechnic University,Wuhu 241000,Anhui,China)
  • Online:2011-03-05 Published:2011-03-05

摘要:

5次固态交换制备的Co2+-NaX500 焙烧6 h,再进行一次固态交换制备高稳定性催化剂,ICP分析表明其Co2+含量为9.13%,高于5次固态交换Co2+-NaX的平衡Co2+含量(8.42%)。采用XRDN2吸附-脱附对催化剂进行表征,结果表明,子筛离子交换后其骨架结构没有受到破坏,然而随交换进入子筛Co2+含量增多,其有序性下降越明显。通过正交实验对该催化剂催化苯乙烯环氧化进行考察,确定了优化的反应条件:苯乙烯用量6 mL催化剂1.0 g溶剂48 mL反应温度80 反应时间6 h。在此条件下,环氧苯乙烷平均收率为39.5%。采用该法制备催化剂其活性能够进一步提高,且重复使用活性保持不变。

Abstract:

Highly stable Co2+-NaX catalyst was prepared from Co2+-NaXwhich was prepared by five times of solid-state ion-exchangecalcination at 500 for 6 h and then another solid-state ion-exchange. ICP results showed that mass fraction of Co2+ in the highly stable Co2+-NaX catalyst was 9.13%which exceeded equilibrium Co2+ mass fraction in Co2+-NaX prepared by five times of solid-state ion-exchange8.42%. The catalysts were characterized by XRD and N2 adsorption- desorption. The results indicated that the framework of NaX was not destroyed after Co2+ exchangewhereas the ordering of NaX decreased with increasing content of Co2+ into the zeolite. The optimal conditions were obtained by orthogonal experiments asstyrene 6 mLcatalyst 1.0 gsolvent 48 mLreaction temperature 80 and reaction time 6 h. Under such conditionsthe average yield of styrene oxide was 39.5%. The catalyst prepared by this method showed higher catalytic activity than Co2+-NaX prepared only by five times of solid-state ion-exchangeand the activity was stable after reuse.

京ICP备12046843号-2;京公网安备 11010102001994号
版权所有 © 《化工进展》编辑部
地址:北京市东城区青年湖南街13号 邮编:100011
电子信箱:hgjz@cip.com.cn
本系统由北京玛格泰克科技发展有限公司设计开发 技术支持:support@magtech.com.cn