纳米氧化锡催化烯烃液相环氧化反应的研究

Epoxidation of Olefins in the Liquid Phase Catalyzed by Nano-SnO_2

采用自制的纳米SnO_2为催化剂,以环境友好的H_2O_2(30%)为氧源,考察其催化烯烃环氧化的反应效果.通过FT-IR光谱、UV-Vis光谱、XRD和TEM对SnO_2催化剂进行了表征.研究发现纳米SnO_2对烯烃的液相环氧化具有非常好的催化效果,并以环己烯为例对反应条件做了相关探讨.实验结果表明,在温度为50℃,H_2O_2与环己烯摩尔比为1.2时,烯烃转化率达到99.9%,环氧选择性高达98.1%.且催化剂循环使用9次催化活性没有发生明显变化.

Nano-SnO2 ,prepared by hydrothermal method, has been characterized by FT-IR, UV-Vis, XRD, and TEM technologies and applied in the epoxidation of alkenes using H2O2（30%）as the oxidant. Under our experimental conditions, the results show that nano-SnO2 exhibits excellent catalytic activities in the titled reactions, e.g. 99.9% conversion of cyclohexene with 98.1% epoxide selectivity is achieved over the catalyst with 1.2 eq. of HeO2 at 50℃. Recycling experiments suggest the the solid catalyst can be reused 9 times without any appreciable loss of catalytic activity.