| 戚建英,杨启云.纳米二氧化钛催化苯乙烯环氧化反应的研究[J].分子催化,2000,(4):294-296 |
| 纳米二氧化钛催化苯乙烯环氧化反应的研究 |
| Study on Nanometer TiO2 in Catalystic Epoxidation of Styrene |
| 修订日期：1999-12-27 |
| DOI： |
| 中文关键词: 催化 苯乙烯 环氧化 二氧化钛 纳米级 |
| 英文关键词:Nanometer TiO 2,Catalytic performance,Styrene epoxidation |
| 基金项目:云南省教委应用基础研究资助课题 |
| 戚建英 杨启云 |
| 云南师范大学化学系!昆明650031四川大学化学系，成都610064，云南师范大学化学系!昆明650031，云南师范大学化学系!昆明650031，四川大学化学系!成都610064 |
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| 中文摘要: |
| 通过烯烃的环氧化反应 ,可制得活泼的有机合成中间体——环氧化物 ,再通过选择性开环或功能团转化 ,可以方便地合成多种有价值的化合物 .因此 ,催化烯烃环氧化的反应得到广泛的研究 ,其中含钛催化剂具有较好的催化性能 ,如 Ti- ZSM- 5沸石 [1,2 ] 、Ti- ZSM- 1 1沸石[3 ,4 ] 在 H2 O2 存在下就有高的催化活性 ;α-和β- [Si W9Ti3 O4 0 ]10 -也有一定的催化活性 [5] ;Sharpless等人 [6]采用 Ti[OCH( CH3 ) 2 ]4和酒石酸二乙酯诱导体 ,可高选择性催化烯丙醇的不对称环氧化反应 .纳米 Ti O2 ,由于颗粒小 ,处于固体表面的原子多 ,表… |
| 英文摘要: |
| The nanometer TiO 2 and nanometer TiO 2/EtOH catalysts were prepared from Ti(SO 4) 2 by the liquid phase method. The properties of these catalysts were characterized using TG DTA, IR, XRD and TEM methods.. The results show that both TiO 2 and TiO 2/EtOH are anatase with the particle sizes of about 60 nm possessing excellent thermal stability. The activities and selectivities of catalysts in styrene epoxidation with t butyl hydroperoxide (TBPH) were examined and the influence of different solvents on catalytic performance was examined. When the oxidation is carried out under suitable conditions, the main product and byproduct are styrene peroxide and phenylformaldehyde, respectively. The conversion of styrene and selectivity to epoxide over nanometer TiO 2/EtOH catalyst are 34.7% and 60.0% , respectively. When cyclohexanone or 1,4 dioxane are used as solvents, the selectivity to epoxide is more than 70%. The ethanol supported nanometer TiO 2 improved the activity obviously and the suitable solvents increased the selectivity to epoxide. |
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