化工进展2011，Vol.30Issue(3)：557-561,5.
CO2+离子交换NaX分子筛催化苯乙烯环氧化
Epoxidation of styrene catalyzed by Co2+- exchanged NaX zeolite
摘要
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 adsorptiondesorption. 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.关键词
离子交换/X型分子筛/苯乙烯/催化环氧化/环氧苯乙烷Key words
ion exchange/ zeolite X/ styrene/ catalytic epoxidation/ styrene oxide分类
化学化工引用本文复制引用
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].化工进展,2011,30(3):557-561,5.基金项目
安徽省高校自然科学基金(kJ2009B105)及安徽工程科技学院引进人才科研启动基金(2007YQQ009)项目. （kJ2009B105）
