Direct oxidation of methane to methanol over proton conductor/metal mixed catalysts

作者：Lee Byungik; Sakamoto Yosuke; Hirabayashi Daisuke; Suzuki Kenzi; Hibino Takashi^*

来源：Journal of Catalysis, 2010, 271(2): 195-200.

DOI：10.1016/j.jcat.2010.01.011

• Methane oxidation
• Methanol synthesis
• Proton conductors
• Electrocatalyst

The intermediate-temperature and low-pressure production of methanol from methane in a one-pass process was investigated using a micro- or nanosized electrocatalyst system. The powdered catalyst was prepared by mixing proton-conducting Sn(0.9)In(0.1)P(2)O(7) particles with high-activity Pd-Au-Cu/C particles to provide numerous electrolyte-electrode interfaces as reaction sites for methane oxidation. For a feed mixture of H(2)O, O(2), and methane, a local electrochemical cell can be formed at the electrode-electrolyte interface: H(2)O -> 1/2O(2) + 2H(+) + 2e(-) at the anode site; O(2) + CH(4) + 2H(+) + 2e(-) -> CH(3)OH + H(2)O at the cathode site. In addition, the electrode also functions as a lead wire that short-circuits the cell. Therefore, the overall reaction can be expected to be CH(4) + 1/2O(2) CH(3)OH. The series of reactions successfully resulted in reduction in the temperature for initiation of methane oxidation to 250 degrees C and increased the methanol yield while maintaining a very high selectivity toward methanol for temperatures up to 400 degrees C.

• 出版日期2010-5-4