Decomposition mechanism of fluorinated compounds in water plasmas generated under atmospheric pressure

Narengerile, Hironori Saito, Takayuki Watanabe

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Decomposition mechanism of HFC-134a, HFC-32, and CF 4 in water plasmas at atmospheric pressure has been investigated. The decomposition efficiency of 99.9% can be obtained up to 3.17 mol kWh -1 of the ratio of hydrofluorocarbon (HFC) feed rate to the arc power and 1.89 mol kWh -1 of the ratio of perfluorocarbon (PFC) feed rate to the arc power. The species such as H 2, CO, CO 2, CH 4, and CF 4 were detected from the effluent gas of both PFC and HFC decomposition. However, CH 2F 2 and CHF 3 were observed only in the case of HFC decomposition. The HFC and PFC decomposition generate CH 2F, CHF x (x:1-2), and CF y (y:1-3) radicals, then those radicals were subsequently oxidized by oxygen, leading to CO and CO 2 generation in the excess oxygen condition. However, when there is insufficient oxygen available, those radicals were easily recombined with fluorine to form by-product such as CH 2F 2, CHF 3, and CF 4.

Original languageEnglish
Pages (from-to)813-829
Number of pages17
JournalPlasma Chemistry and Plasma Processing
Volume30
Issue number6
DOIs
Publication statusPublished - Dec 2010
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Condensed Matter Physics
  • Surfaces, Coatings and Films

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