Oxidative Coupling of Methane under High-pressure Conditions Using a Na<sub>2</sub>WO<sub>4</sub>/SiO<sub>2</sub> Catalyst

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  • WACHI Keiju
    Dept. of Applied Chemistry, School of Engineering, The University of Tokyo
  • YABE Tomohiro
    Dept. of Applied Chemistry, School of Engineering, The University of Tokyo
  • NAKANO Ryo
    Dept. of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University
  • YAMASHITA Makoto
    Dept. of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University
  • YAMAGUCHI Kazuya
    Dept. of Applied Chemistry, School of Engineering, The University of Tokyo

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Other Title
  • Na<sub>2</sub>WO<sub>4</sub>/SiO<sub>2</sub>触媒を用いた高圧条件下におけるメタン酸化カップリング
  • Oxidative Coupling of Methane under High-pressure Conditions Using a Na₂WO₄/SiO₂ Catalyst

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<p>Direct conversion of methane into useful chemicals has attracted great attention as an alternative to the current syngas process. Methane oxidation achieves high methane conversion under high-pressure conditions through homogeneous radical reactions; however, control of product selectivity using catalysts remains a challenge. This study found that the oxidative coupling of methane occurred efficiently at 410 °C and 6.0 MPa using Na2WO4/SiO2 as both initiator and catalyst. In this catalytic system, C2 and C3 hydrocarbons were mainly obtained from methane and oxygen through concerted reactions both in the gas phase and on the catalyst surface. Furthermore, methane oxidation experiments under various reaction conditions revealed that the selectivity of homogeneous methane oxidation in the gas phase shifted from methanol to C2 and C3 hydrocarbons, due to the exothermic catalytic reaction and the temperature increase in the catalyst bed. Furthermore, the catalytic reaction also improved the selectivity for C2 and C3 hydrocarbons at lower pressures. These different roles of the catalyst offer valuable insights for developing high-pressure partial oxidation of methane to form methanol.</p>

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