Conversion of 1,1,2-trichlorotrifluoroethane to 1,1,1-trichlorotrifluoroethane and 1,1-dichlorotetrafluoroethane over aluminium-based catalysts

被引：35

作者：

Bozorgzadeh, H

Kemnitz, E

Nickkho-Amiry, M

Skapin, T

Winfield, JM ^{[1
]}

机构：

[1] Univ Glasgow, Dept Chem, Glasgow G12 8QQ, Lanark, Scotland

[2] Humboldt Univ, Inst Inorgan Chem, D-10115 Berlin, Germany

[3] Jozef Stefan Inst, Ljubljana 1000, Slovenia

来源：

JOURNAL OF FLUORINE CHEMISTRY | 2001年 / 107卷 / 01期

关键词：

isomerization; dismutation; CFC; aluminium; fluoride;

D O I：

10.1016/S0022-1139(00)00350-X

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Conversion of CCl2FCCIF2 to CCl2FCF3 is achieved in the temperature range, 593-713 K. under flow conditions by using the catalysts, beta -AlF3 or gamma -alumina- prefluorinated with CCl2F2 or SF4. Aluminium-based catalysts favour the formation of asymmetric isomers in the chlorofluoroethane series, hence CCl3CF3 is also a significant product. More highly chlorinated materials, containing greater than or equal to4 Cl atoms, and CClF2CF3 are minor products. Product composition data provided evidence for the possible pathway CCl2FClF2 - CCl3CF3 --> CCl2FCF3. The isomerisation step is believed to be intramolecular and is facile. The apparent fluorination step is best described as a dismutation. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：45 / 52

页数：8

共 41 条

[1] Role of chlorocarbon oligomers in the room-temperature heterogeneous catalytic fluorination of hydrochlorocarbons to hydrochlorofluorocarbons [J].