Effect of Zinc-Cobalt Ratio on Desulfurization and Hydrogenation Catalysis of Zinc-Cobalt Desulfurizer

Abstract

Purposes ZnO-based desulfurizer has the problems of low sulfur capacity and low regeneration performance for ambient H2S removal process, which forms solid waste after desulfurization. Methods Cobalt species were introduced into ZnO-based desulfurizer, and the effects of different Co contents on the structure and desulfurization performance of zinc-cobalt desulfurizer were investigated. The samples before and after desulfurization were characterized, and the spent zinc-cobalt desulfurizer after desulfurization was used as organic sulfur hydrogenation catalyst for the hydrogenation of COS and thiophene at different reaction temperatures. Findings The addition of Co promotes the dispersion of ZnO desulfurizer and improves the texture properties of desulfurizer. When the content of Co in the desulfurizer is 30%, the performance of zinc-cobalt desulfurizer is the best, and the breakthrough sulfur capacity is 160.1 mg/g. The experimental results of hydrogenation of COS and thiophene show that when the content of Co is 50%, the conversions of COS and thiophene can reach 100% and 45%, respectively. Conclusions The results of this study provide a new idea for the utilization of desulfurizer and an optimal design of hydrogenation catalyst.

Keywords

• h2s removal
• spent desulfurizer
• co content
• organic sulfur
• hydrogenation