Halogen exchange reactions for CFC alternatives. The behaviour of fluorine-18 labelled hydrogen fluoride towards prefluorinated chromia containing nickel( II) or zinc( II)

被引：22

作者：

Bonniface, DW

Fryer, JR

Landon, P

Scott, JD

Scott, WDS

Watson, MJ

Webb, G ^{[1
]}

Winfield, JM

机构：

[1] ICI Klea, Res & Technol Dept, Runcorn WA7 4QD, Cheshire, England

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

来源：

GREEN CHEMISTRY | 1999年 / 1卷 / 01期

关键词：

D O I：

10.1039/a808021f

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Highly active catalysts are required for the conversion of CF3CH2Cl to the CFC-alternative refrigerant, CF3CH2F, by HF vapour under heterogeneous conditions. Chromia impregnated with a very low level of zinc(II) is a superior catalyst precursor to chromia alone. The behaviour of prefluorinated chromia and prefluorinated chromia containing zinc(II) or nickel(II) towards fluorine-18 labelled HF indicates that two types of labile surface fluoride are present, only one of which is catalytically active. Proposals are made to account for the role of Zn-II and Ni-II.

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页码：9 / 11

页数：3

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