Acetone decomposition by water plasmas at atmospheric pressure

Narengerile, T. Watanabe

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Decomposition of aqueous acetone was performed using a direct current (DC) plasma torch at atmospheric pressure. The torch can generate the plasma with water as the plasma-supporting gas in the absence of any additional gas supply system and cooling devices. The results indicated that 5mol% acetone was drastically decomposed by water plasmas with energy efficiencies of 1.7×10 -7molJ -1. The major products in the effluent gas were H 2 (60-70%), CO 2 (5-16%), CO (6-16%), and CH 4 (0.2-0.9%). However, trace levels of formic acid (HCOOH) and formaldehyde (HCHO) were observed in the liquid effluent. Based on the experimental results and information from the literature, the following decomposition mechanism was proposed for acetone in water plasmas: first, electron dissociation in arc region generates acetyl (CH 3CO) and methyl (CH 3) radicals; then, chemical oxidation or reduction in plasma flow region forms CO and CH x(x:1-3) radicals there. Finally, the generated intermediate species undergo complex reactions to form stable compounds such as CO in downstream region. However, if little oxygen is present, those intermediate species easily recombine with each other or are oxidized by OH to form unwanted by-products, such as HCOOH and HCHO.

Original languageEnglish
Pages (from-to)296-303
Number of pages8
JournalChemical Engineering Science
Volume69
Issue number1
DOIs
Publication statusPublished - Feb 13 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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