Abstract
For a distributed PEMFC power station utilizing biogas as a source to produce hydrogen, deep desulfurization of the biogas is important. ZnO/γ-Al2O3 and CuO/γ-Al2O3 were prepared by an impregnation method, and their performances on CH3SH removal in the biogas have been studied. Results showed that CuO/γ-Al2O3 is able to remove CH3SH to below 10 ppb at 250-400 °C and has a sulfur capacity of 0.056 mmol g-1 at 300 °C. Regarding to the desulfurization mechanism, it has been confirmed that the removal of CH3SH with CuO/γ-Al2O3 is based on chemical adsorption. In the desulfurization, CH4s dry reforming took place at above 250 °C, and the generated H2 and CO reduced CuO to Cu2O and Cu. Further, it was supposed that H2S generates through the hydrogenation of CH3SH at the presence of H2.
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