Interaction among Metal Components of Zn–Mn–Cu-Based Sorbents Prepared by High-Pressure Impregnation Method and Its Effect on the Removal of H2S from Hot Coal Gas

Abstract

A series of metal oxide sorbents for the deep removal of H2S from hot coal gas were synthesized using a high-pressure impregnation method. Semicoke was selected as support and the solutions of one or more combination among zinc nitrate, manganese nitrate, and copper nitrate were selected as the active component precursors in the preparation process of sorbents. SEM results show that these metal oxides can be evenly dispersed onto semicoke support with nanometer particle sizes by a high-pressure impregnation method. Simultaneously, the pore structures of the sorbents are significantly improved through the hydrothermal process of high-pressure impregnation. The desulfurization activities of the Zn–Mn–Cu-based sorbents in a fixed-bed reactor under feeding gas of CO (33 vol %), H2 (39 vol %), H2S (500 ppmv), and N2 (balance) are much better than those of single Zn-, Mn-, and Cu-based as well as double Zn–Mn-based sorbents prepared under the same operating conditions. The Z20M4C6SC sorbent can remove H2S from ...