Low-Temperature Highly Efficient and Selective Removal of H2S over Three-Dimensional Zn-Cu-Based Materials in an Anaerobic Environment.

Abstract

In this study, novel three-dimensional ribbon-like composite materials have been introduced for selectively capturing H2S in a low-temperature dry anaerobic environment. First, a ribbon-like basic copper carbonate precursor with Zn doping supported on the activated semicoke (ASC) was successfully synthesized in situ by a two-step hydrothermal method for the first time. The porous Zn-Cu materials obtained after calcination were applied as a sorbent to remove H2S under anaerobic conditions at a low temperature. Effects of the heat treatment temperature, Cu loading content, and Zn doping content on the anaerobic desulfurization performance of Zn-doped CuOx/ASC sorbents were investigated. The optimal Zn-doped CuOx/ASC sorbent showed a satisfactory activity and selectivity to capture H2S efficiently with a breakthrough capacity of 126 mg/g. Further mechanism study demonstrates that the super desulfurization performance of this sorbent is mainly attributed to abundant pore distribution, the synergistic effect between copper and zinc, the extensive surface active oxygen, and so forth.