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化学学报
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化学学报 ›› 1997, Vol. 55 ›› Issue (3): 277-284. 上一篇    下一篇

研究论文

气态CF2ClBr的紫外光解离

邓国红;章跃;李林;于勇;刘正超;侯惠奇   

  1. 复旦大学环境科学研究所;复旦大学物理二系
  • 发布日期:1997-03-15

The UV photo-dissociation of gaseous CF2ClBr

DENG GUOHONG;ZHANG YUE;LI LIN;YU YONG;LIU ZHENGCHAO;HOU HUIQI   

  • Published:1997-03-15

PDF

613

被引次数

16

本文研究了气态CF2ClBr在253.7nm紫外光照下的光解离过程及光氧化机理。CF2ClBr-O2体系光解离的主要产物CF2O, Cl2和Br2, 另外还有少量的CO2, SiF4生成; 该体系中CF2ClBr的解离为一级反应, 光解离速率常数为1.89×10^-^5s^-^1; CF2ClBr的表观量子产率近似为1。在这些基础上讨论了光解离过程及光氧化机理。

关键词: 光氧化, 溴甲烷, 氯甲烷, 氟代甲烷, 解离

This paper studied the photo-dissociation and photo-oxidation of CF2ClBr vapor at 253.7nm. The CF2ClBr-O2 system under photo-dissociation condition gives major products such as CF2O, Cl2, Br2, minor ones e. g. CO2 and SiF4. The dissociation of CF2ClBr is a first-order reaction and the corresponding rate constant is about 1.89×10^-^5s^-^1. The apparent quantum yield of CF2ClBr is about unit. Based on the experimental results, the photo-dissociation process, the photo-oxidation mechanism of CF2ClBr and the change of CF2ClBr after being delivered into the stratosphere were discussed.

Key words: PHOTOOXIDATION, METHYL BROMIDE, CHLOROMETHANE, FLUOMETHANE, DISSOCIATION

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