Direct synthesis of methanol from methane and water-vapor mixture using ultra-dhort pulse plasma

Ken Okazaki, Nobuhide Yamada, Takuya Kishida, Kuniyasu Ogawa, Shuichiro Hirai

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Direct synthesis of methanol from methane/water-vapor mixture has a high possibility to realize a highly sophisticated energy utilization system with exergy regeneration. However, this process can never occur by conventional thermochemical methods due to the large increase of Gibbs free energy. In this study, the direct synthesis of methanol from methane/water-vapor mixture has been successfully realized by low-temperature and nonequilibrium plasma chemical reactions using a newly developed ultra-short pulse plasma, and effects of reaction time, peak voltage, pulse width and initial gas composition on the methanol formation characteristics have been clarified. In the case of spatially uniform pulse-glow plasma, maximum yield of 0.2% and maximum selectivity of 3% have been achieved. The time dependent change of emission intensity for CH radicals also showed the advantage of using ultra-short pulsed voltage for high energy input into the reaction field. Further, the methanol synthesis has been significantly improved by use of a newly found "filamentary" discharge mode which is realized by adjusting gas pressure and pulse parameters of peak voltage, pulse width and pulse frequency, and much higher values of 0.52% and 10% for methanol yield and selectivity have been attained, respectively. It has been also found that the mixing of rare gas largely enhances the methanol yield and its mechanism is discussed.

Original languageEnglish
Pages (from-to)3052-3059
Number of pages8
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume64
Issue number625
Publication statusPublished - 1998
Externally publishedYes

Fingerprint

Water vapor
water vapor
Methane
Methanol
methane
methyl alcohol
Plasmas
synthesis
pulses
pulse duration
Electric potential
electric potential
selectivity
exergy
nonequilibrium plasmas
Exergy
gas composition
Gibbs free energy
cold plasmas
Inert gases

Keywords

  • Exergy
  • Fuel reforming
  • Methanol synthesis
  • Plasma
  • Pulse plasma

ASJC Scopus subject areas

  • Mechanical Engineering
  • Condensed Matter Physics

Cite this

Direct synthesis of methanol from methane and water-vapor mixture using ultra-dhort pulse plasma. / Okazaki, Ken; Yamada, Nobuhide; Kishida, Takuya; Ogawa, Kuniyasu; Hirai, Shuichiro.

In: Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, Vol. 64, No. 625, 1998, p. 3052-3059.

Research output: Contribution to journalArticle

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