摘要
采用离子交换法制备Co-LsX催化剂,分子筛经Co2+离子交换后,其骨架结构没有发生变化。考察了反应温度、反应时间、催化剂用量、溶剂加入量及氧气通入速率等因素对苯乙烯环氧化反应的影响。得出最佳工艺条件:反应温度100℃,反应时间6 h,Co-LsX与苯乙烯质量比为0.16,混合溶剂与苯乙烯体积比为5;V(O2)∶V(苯乙烯)=1.3 min-1。在此条件下苯乙烯转化率达到62.5%,环氧苯乙烷的选择性达到57.1%。催化剂经6次循环使用后活性和稳定性都比较好。
The Co-LsX catalyst is synthesized via ion-exchange procedures. The basic framework structure of zeolite LsX hasn＇t been destroyed after Co^2 ＋ ion exchange. The effects of reaction temperature, reaction time, the amount of catalyst, the amount of solvent and the flow rate of oxygen on the reaction of styrene epoxidation are investigated in details. The best condition is found as follows： 100℃ of reaction temperature,reacting for 6 hours,0.16：1 of the mass ratio of Co-LsX to styrene,5 ： 1 of the volume ratio of mix solvent to styrene, 1.3 ： 1 rain^- 1 of the volume ratio of oxygen to styrene. Under these conditions, the conversion of styrene could reach 62.5% ,and the selectivity of styrene oxide was 57.1% .The catalyst can be recycled for six times with high activity and stability kept.
出处
《现代化工》
EI
CAS
CSCD
北大核心
2006年第8期44-47,51,共5页
Modern Chemical Industry
