A series of Fe–Mn-based sorbents with different Fe/Mn mole ratios was prepared via coprecipitation for the high-temperature removal of H2S. Performance tests were carried out at 1123 K in a fixed-bed reactor, indicating that metallic Fe and MnO were the active components of the Fe–Mn-based sorbents in the hot gas. Single Fe-based sorbents exhibited a low desulfurization efficiency and effective sulfur capacity. The addition of manganese (Fe/Mn mole ratios less than 8:2) considerably improved the desulfurization efficiency and effective sulfur capacity of the Fe-based sorbents. In the first sulfidation test, effective sulfur capacities of 20.71, 20.72, and 20.14 g S/(100 g sorbent) were obtained for Mn7Fe3, Mn5Fe5, and Mn3Fe7, respectively. During five sulfidation–regeneration cycles, Mn7Fe3, Mn5Fe5, and Mn3Fe7 were stable, maintaining high activities and sulfur capacities, and reduced the amount of H2S to a few ppmv. After sulfidation, the sulfided sorbents could easily be regenerated with 2% O2 in N2 at 1123 K to obtain SO2 and S2. The elemental sulfur recovery rate increased with the decrease of manganese content. Characterization with XRD, SEM, and BET showed that Fe–Mn-based sorbents kept stable structures during successive sulfidation–regeneration cycles.
We report an electrochemical oxidation strategy to synthesize DMF directly from market-surplus trimethylamine and couple it with hydrogen production. The reaction was achieved in an aqueous medium without any mediator using water as the oxidant.
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