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Methane is an important C1 resource for the production of high-value chemicals
.
Because methane reserves are in remote areas, the conversion of methane into transportable oxygenates (methanol, formic acid, acetic acid, etc.
In response to the above problems, the researchers developed a ZSM-5 supported Au catalyst, which uses O2 to selectively oxidize methane to methanol and acetic acid under mild conditions at 120-240 °C.
Oxygenates yields of 7.
3 mol/molAu/h were obtained over time
.
Through two-dimensional 1H-13C correlation spectrum NMR experiments combined with 12C and 13C isotope tracer techniques, the mechanism of methane conversion was deeply studied, and it was found that Au nanoparticles on the surface of the catalyst could promote the activation of oxygen to generate reactive oxygen species and react with methane.
This work not only provides solid experimental evidence for the selective oxidation of methane under oxygen by heterogeneous catalysts, but also provides a new research idea for the "holy grail" reaction in the field of methane selective conversion
Fig.
