A mechanism for the destruction of CFC-12 in a nonthermal, atmospheric pressure plasma

被引：34

作者：

Ricketts, CL ^{[1
]}

Wallis, AE ^{[1
]}

Whitehead, JC ^{[1
]}

Zhang, K ^{[1
]}

机构：

[1] Univ Manchester, Dept Chem, Manchester M13 9PL, Lancs, England

来源：

JOURNAL OF PHYSICAL CHEMISTRY A | 2004年 / 108卷 / 40期

基金：

英国医学研究理事会;

关键词：

D O I：

10.1021/jp047546i

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The destruction of CFC-12 (CF2Cl2) has been studied in an AC, nonthermal, atmospheric pressure plasma reactor packed with barium titanate beads. The extent of the destruction in air ranges between 8% and 40% depending on the conditions. The decomposition products in air as determined by infrared spectroscopy are CO, CO2, and COF2. It is deduced that the undetected chlorine and fluorine is present as F-2 and Cl-2. A chemical mechanism for the decomposition is proposed. Large concentrations of NO, NO2, and N2O are also formed. Destruction in a stream of pure N-2 is about twice as effective as in air under corresponding conditions. The addition of a small amount of water (similar to0.03%) or oxygen (similar to0.02%) to the nitrogen carrier gas increases the destruction efficiency but the presence of molecular hydrogen (less than or equal to2%) brings about no enhancement. It is suggested that in all cases, the primary decomposition step involves dissociative electron attachment to the CF2Cl2. This is confirmed by the observed differences in the destruction in pure nitrogen and in air.

引用

页码：8341 / 8345

页数：5

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