Journal
FUEL
Volume 358, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2023.130318
Keywords
Cuprous chloride; Copper chloride hydroxide; Self-assembly; Hydrogen sulfide; Reactive removal; Sulfidation
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A self-assembly method was developed to synthesize cuprous chloride/copper chloride hydroxide composites for investigating their hydrogen sulfide (H2S) removal performances. It was found that the Cu intermediate product by Fe reduction reacted with CuCl2 to form CuCl, which then self-assembled with CuCl2 and H2O to generate copper chloride hydroxides shell layer, leading to increased H2S adsorption capacity. Extensive analyses revealed the sulfidation reaction mechanism of CCCCHs, showing that the decomposition of CCHs enhanced the H2S treatment capacity substantially.
In this work, a self-assembly method is developed to synthesize a series of cuprous chloride/copper chloride hydroxide composites (CCCCHs). The hydrogen sulfide (H2S) removal performances of these materials are investigated under the conditions of 25 degrees C, 1 atm and the inlet H2S concentration of 250 ppm in a gaseous N2 mixture with a flow rate of 40 mL min-1. It is demonstrated that the intermediate product of Cu by Fe reduction can react with CuCl2 to form cuprous chloride (CuCl). Then, CuCl2 and H2O are self-assembled on the surface of CuCl to generate the shell layer of copper chloride hydroxides (CCHs). When the molar ratio of CuCl2 to Fe is 4, the CCCCHs show the largest H2S adsorption capacity of 259.5 mg g-1 because CuCl core is almost covered by CCHs overlayers. Based on extensive results of XRD, SEM, TEM, EDS, XPS and FTIR analyses, the sulfidation reaction mechanism of CCCCHs can be revealed. When react with H2S, the CCHs surface is decomposed to generate CuCl2 & sdot;2H2O and Cu2+ is reduced to Cu+, which is accompanied by the oxidation of H2S to form elemental sulfur and sulfate. During the decomposition process of CCHs, sulfidation reaction can penetrate deeply into the adsorbent particles, and the H2S treatment capacity of adsorbent is substantially improved.
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