摘要
制备了 SO2 - 4/Ti O2 、SO2 - 4/Zr O2 和一系列钛锆原子比不同的 SO2 - 4/Ti O2 -Zr O2 固体酸催化剂 ,并通过 XRD、FTIR和 TG-DTA等进行了表征 ;研究了这些催化剂上硝酸硝化氯苯的区域选择性 .结果表明 ,在醋酐存在下 ,氯苯与等物质量的硝酸反应 ,其产物具有强对位选择性 ,在 SO2 - 4/Ti O2 -Zr O2 (原子比 1∶ 2 )催化剂上 ,氯苯一硝化产物中邻 /对硝基氯苯异构体的质量比达 0 .2 9,较硝硫混酸硝化的 0 .5 7显著降低 ,产物得率可达 70 .2 % .
The solid acid catalysts of SO 2- 4/TiO 2 and SO 2- 4/ZrO 2 and a series of SO 2- 4/TiO 2 ZrO 2 catalysts have been prepared and characterized by XRD, FTIR and TG DTA. The regioselectivities of chlorobenzene in mononitration with these catalysts were investigated. It was found that chlorobenzene is nitrated with high para selectivity in the presence of acetic anhydride using the solid acid as catalyst and a stoichiometric quantity of nitric acid. Over SO 2- 4/TiO 2 ZrO 2(atom ratio 1∶2) catalyst, nitration of chlorobenzene gives a 70 2% yield of mononitro compounds, with an ortho para isomer ratio 0 29, greatly below 0 57 as sulfonitric acid as catalyst. The process is rapid, and the catalysts can be repeatedely used 4 times without reduction of ortho/para ratio of product.
出处
《应用化学》
CAS
CSCD
北大核心
2002年第3期271-275,共5页
Chinese Journal of Applied Chemistry
基金
江苏省自然科学基金 (BK 990 71)资助项目
