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

Claire L. Ricketts; Anna E. Wallis; J. Christopher Whitehead; Kui Zhang

doi:10.1021/jp047546i

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

Claire L. Ricketts, Anna E. Wallis, J. Christopher Whitehead, Kui Zhang

Research output: Contribution to journal › Article › peer-review

Abstract

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 F2 and Cl2. A chemical mechanism for the decomposition is proposed. Large concentrations of NO, NO2, and N2O are also formed. Destruction in a stream of pure N2 is about twice as effective as in air under corresponding conditions. The addition of a small amount of water (∼0.03%) or oxygen (∼0.02%) to the nitrogen carrier gas increases the destruction efficiency but the presence of molecular hydrogen (≤2%) brings about no enhancement. It is suggested that in all cases, the primary decomposition step involves dissociative electron attachment to the CF 2Cl2. This is confirmed by the observed differences in the destruction in pure nitrogen and in air.

Original language	English
Pages (from-to)	8341-8345
Number of pages	4
Journal	Journal of Physical Chemistry A
Volume	108
Issue number	40
DOIs	https://doi.org/10.1021/jp047546i
Publication status	Published - 7 Oct 2004

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

abstract = "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 F2 and Cl2. A chemical mechanism for the decomposition is proposed. Large concentrations of NO, NO2, and N2O are also formed. Destruction in a stream of pure N2 is about twice as effective as in air under corresponding conditions. The addition of a small amount of water (∼0.03%) or oxygen (∼0.02%) to the nitrogen carrier gas increases the destruction efficiency but the presence of molecular hydrogen (≤2%) brings about no enhancement. It is suggested that in all cases, the primary decomposition step involves dissociative electron attachment to the CF 2Cl2. This is confirmed by the observed differences in the destruction in pure nitrogen and in air.",

author = "Ricketts, {Claire L.} and Wallis, {Anna E.} and Whitehead, {J. Christopher} and Kui Zhang",

year = "2004",

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T1 - A mechanism for the destruction of CFC-12 in a nonthermal, atmospheric pressure plasma

AU - Ricketts, Claire L.

AU - Wallis, Anna E.

AU - Whitehead, J. Christopher

AU - Zhang, Kui

PY - 2004/10/7

Y1 - 2004/10/7

N2 - 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 F2 and Cl2. A chemical mechanism for the decomposition is proposed. Large concentrations of NO, NO2, and N2O are also formed. Destruction in a stream of pure N2 is about twice as effective as in air under corresponding conditions. The addition of a small amount of water (∼0.03%) or oxygen (∼0.02%) to the nitrogen carrier gas increases the destruction efficiency but the presence of molecular hydrogen (≤2%) brings about no enhancement. It is suggested that in all cases, the primary decomposition step involves dissociative electron attachment to the CF 2Cl2. This is confirmed by the observed differences in the destruction in pure nitrogen and in air.

AB - 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 F2 and Cl2. A chemical mechanism for the decomposition is proposed. Large concentrations of NO, NO2, and N2O are also formed. Destruction in a stream of pure N2 is about twice as effective as in air under corresponding conditions. The addition of a small amount of water (∼0.03%) or oxygen (∼0.02%) to the nitrogen carrier gas increases the destruction efficiency but the presence of molecular hydrogen (≤2%) brings about no enhancement. It is suggested that in all cases, the primary decomposition step involves dissociative electron attachment to the CF 2Cl2. This is confirmed by the observed differences in the destruction in pure nitrogen and in air.

U2 - 10.1021/jp047546i

DO - 10.1021/jp047546i

M3 - Article

SN - 1520-5215

VL - 108

SP - 8341

EP - 8345

JO - Journal of Physical Chemistry A

JF - Journal of Physical Chemistry A

IS - 40

ER -

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

Abstract

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