【摘要】 以NaC l改性Ag/S iO2为催化剂,分子氧为氧化剂,对苯乙烯环氧化制备环氧苯乙烷的反应进行了研究,考察了Ag负载量、NaC l修饰量、焙烧温度、反应温度、n(苯乙烯)/n(O2)等因素对反应性能的影响。结果表明,Ag和NaC l的最佳负载量分别为10%和1%,Ag/S iO2催化剂在600℃下焙烧效果最好,在250℃,n(苯乙烯)/n(O2)为10,N2为平衡气,空速为3600 h-1的条件下反应,催化剂的性能最佳,苯乙烯的转化率和环氧苯乙烷的选择性分别为35%和68%。更多还原

【Abstract】 Epoxidation of styrene for preparing styrene oxide was studied using NaCl-modified Ag/SiO₂ as catalysts and molecular oxygen as oxidant.The effects of some factors such as loading of Ag and NaCl,calcination temperature,reaction temperature and the mole ratio of styrene/O₂ are investigated.The result indicated that loading of 10% Ag and 1% NaCl and baking temperature of 600℃ are best respectively.Under the conditions of n（styrene）/n（O₂）=10,N₂ acting as balance gas,SV=3600 h^-1 and 250 ℃,conversion of styrene and selectivity of styrene oxide were 35% and 68% respectively with best catalysis performance.更多还原