Water density dependence of formaldehyde reaction in supercritical water

Mitsumasa Osada, Masaru Watanabe, Kiwamu Sue, Tadafumi Adschiri, Kunio Arai

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37 Citations (Scopus)

Abstract

The water density dependence of formaldehyde (HCHO) reaction in supercritical water (SCW) was studied with batch experiments. Major products from the reaction were methanol (CH3OH), formic acid (HCOOH), hydrogen (H2), carbon monoxide (CO) and carbon dioxide (CO 2). It was found that the Cannizzaro reaction mechanism was the preferred reaction pathway for HCHO reaction in SCW. At higher water densities, CH3OH yields increased confirming the predominance of the Cannizzaro reaction mechanism. At low water densities, CO yields increased and CH 3OH yields decreased, which indicated that monomolecular decomposition became the main reaction pathway. Addition of base to the reacting mixtures was found to promote the Cannizzaro reaction path whereas addition of acid promoted monomolecular decomposition.

Original languageEnglish
Pages (from-to)219-224
Number of pages6
JournalJournal of Supercritical Fluids
Volume28
Issue number2-3
DOIs
Publication statusPublished - 2004 Mar

Keywords

  • Cannizzaro reaction
  • Formaldehyde
  • Hydroxide ion
  • Supercritical water
  • Water gas shift reaction

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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