Effect of oxomolybdate species dispersion on direct methanol oxidation to dimethoxymethane over MoOx/TiO2 catalysts

Jérémy Faye, Mickaël Capron, Atsushi Takahashi, Sébastien Paul, Benjamin Katryniok, Tadahiro Fujitani, Franck Dumeignil

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

The one-step selective oxidation of methanol to dimethoxymethane (DMM) was demonstrated over titania-supported molybdenum oxide catalysts, containing different amounts of molybdenum and prepared using two different impregnation techniques, namely wet impregnation and incipient wetness impregnation. The corresponding catalysts exhibited both acidic and redox properties, which are necessary for the oxidation of methanol to formaldehyde with subsequent condensation of the latter with excess methanol to finally yield DMM. The formation of well-dispersed polyoxomolybdate species on the catalyst surface was evidenced using IR-Raman, X-ray diffraction, and nitrogen physisorption. Varying the amount of these polyoxomolydate species was associated with a modulation of the acidic and redox properties, as shown by NH3-TPD and H2-TPR. With respect to the catalytic performances, the best balance between acid and redox properties was observed over the samples containing 8 wt.% Mo, which corresponds to a theoretical MoOx species coverage close to a monolayer.

Original languageEnglish
Pages (from-to)115-125
Number of pages11
JournalEnergy Science and Engineering
Volume3
Issue number2
DOIs
Publication statusPublished - 2015 Mar

Keywords

  • Catalyst
  • Dimethoxymethane
  • Methanol
  • Molybdenum
  • Oxidation
  • Titania

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality
  • Energy(all)

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