• 工业催化 • Previous Articles Next Articles
ZHANG Xu,XU Maodong,LI Xingyang,LI Fang
Online:
Published:
张 旭,许茂东,李兴扬,李 芳
Abstract:
Highly stable Co2+-NaX catalyst was prepared from Co2+-NaX,which was prepared by five times of solid-state ion-exchange,calcination 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-exchange(8.42%). The catalysts were characterized by XRD and N2 adsorption- desorption. The results indicated that the framework of NaX was not destroyed after Co2+ exchange,whereas the ordering of NaX decreased with increasing content of Co2+ into the zeolite. The optimal conditions were obtained by orthogonal experiments as:styrene 6 mL,catalyst 1.0 g,solvent 48 mL,reaction temperature 80 ℃ and reaction time 6 h. Under such conditions,the 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-exchange,and the activity was stable after reuse.
摘要:
将5次固态交换制备的Co2+-NaX于500 ℃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XRD、N2吸附-脱附对催化剂进行表征,结果表明,分子筛离子交换后其骨架结构没有受到破坏,然而随交换进入分子筛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。
ZHANG Xu,XU Maodong,LI Xingyang,LI Fang. Epoxidation of styrene catalyzed by Co2+- exchanged NaX zeolite[J]. .
张 旭,许茂东,李兴扬,李 芳. Co2+离子交换NaX分子筛催化苯乙烯环氧化 [J]. CIESC Journal.
0 / / Recommend
Add to citation manager EndNote|Ris|BibTeX
URL: https://hgxb.cip.com.cn/EN/
https://hgxb.cip.com.cn/EN/Y2011/V30/I3/557