| Summary: | The temperature of industrial gas containing harmful H<sub>2</sub>S can reach hundreds of degrees. However, few processes can be used directly for H<sub>2</sub>S removal from industrial high-temperature gas. In this work, three polyoxometalates with different central atoms ((n-Bu<sub>4</sub>N)<sub>3</sub>VMo<sub>12</sub>O<sub>40</sub>, (n-Bu<sub>4</sub>N)<sub>3</sub>PMo<sub>12</sub>O<sub>40</sub>, and (n-Bu<sub>4</sub>N)<sub>4</sub>[α-SiMo<sub>12</sub>O<sub>40</sub>]) were synthesized and dissolved in four ionic liquids (Bmim]Cl, [Bmim]HCO<sub>3</sub>, [Bmim]Mes, or [Bmim]OAc) for H<sub>2</sub>S removal from high-temperature (90–180 °C) gases. The result showed that (n-Bu<sub>4</sub>N)<sub>3</sub>VMo<sub>12</sub>O<sub>40</sub>/[Bmim]OAc exhibited the optimal desulfurization performance, maintaining more than 98.6% desulfurization efficiency within 10 h. The reacted desulfurization solution can be regenerated by blowing air. FT-IR and XPS results show that both the central atom V and the coordination atom Mo of the polyoxometalate are involved in the oxidation of H<sub>2</sub>S; after the regeneration by introducing air, V(+IV) and Mo(+IV) recovered to V(+V) and Mo(+VI), respectively. Our research shows that (n-Bu<sub>4</sub>N)<sub>3</sub>VMo<sub>12</sub>O<sub>40</sub>/[Bmim]OAc is an efficient, easy-to-regenerate, and suitable high-temperature gas desulfurization solution.
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