In-situ regenerable Cu/Zeolite adsorbent with excellent H2S adsorption capacity for blast furnace gas

Abstract

Desulfurization of blast furnace gas (BFG) is essential for steel companies to achieve its cleaner utilization. In this study, an in-situ regeneratable H2S adsorbent with a high sulfur capacity was developed. Zeolites with specific silica-aluminum ratios were selected, and hybrid Cu/zeolites adsorbents were synthesized using an impregnation method. The optimal adsorbent (DSZ-2) exhibited a high breakthrough sulfur capacity of 39.0 mg/g at 80 °C. Moreover, this adsorbent can also be in-situ regenerated at lower temperatures (280 ℃) and the regenerated adsorbent has even a higher breakthrough sulfur capacity of 49.0 mg/g. The possible desulfurization and regeneration mechanism of the DSZ-2 absorbent are discussed. Due to its high sulfur capacity and good regenerability, this absorbent has great application prospect in the removal of H2S from BFG.