Efficient conversion of methane in aqueous solution assisted by microwave plasma technology with a novel electrode

In order to fully utilize the advantages of liquid phase discharge and achieve efficient hydrogen production. This paper designed an new-type electrode structure and determined the optimal the electrode length in the reactor. On this basis, the contribution of solution pH and H radical to methane reforming in liquid-phase microwave plasma for hydrogen production was mainly discussed. The results indicated that acidic conditions are more conducive to increasing hydrogen production, while alkaline conditions can increase the percentage content of hydrogen. The difference in hydrogen production performance is speculated to be related to the influence of H+ or OH− concentration in the solution on the relative strength of discharge radicals. The important role of H radical in the reaction system was determined through the addition of radical quenchers and spectral diagnosis. H radicals are not only important substances in the reaction to generate H2 but also have an impact on the conversion of methane and the strength of other radicals, thereby changing the amount of other gas-phase products. On the premise of achieving the goal of stable discharge, this experiment provides theoretical guidance for the subsequent liquid phase discharge reforming of methane to produce hydrogen.