Abstract
The direct conversion of methane into the value-added chemical methanol using molecular oxygen was investigated via plasma catalysis under mild condition. An efficient synergistic effect between plasma and catalyst was achieved using an oxygen vacancy-rich ZnO/Al2O3 catalyst. A high methanol selectivity of 48.5 % and a high synergy factor of 2.1 could be achieved simultaneously over ZnO/Al2O3 R300 catalyst. The presence of oxygen vacancies played a crucial role in methanol formation. A close relationship between oxygen vacancy content and methanol selectivity was established. In situ DRIFT and optical emission spectra were employed to identify key intermediates, and a plausible reaction mechanism was proposed. The CH3 and CH3O species were the key intermediates on the catalyst surface. The oxygen vacancy could efficiently adsorb the O radicals and accelerate the formation of CH3O species. This work offers insights into the rational engineering of efficient catalyst for plasma catalysis process.
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