Dual-functional Zn-based sorbents for removing H2S from hot coal gas and suppressing COS-formation: one-pot synthesis and mechanism of inhibiting COS-release

作者：Xinwei Duan, Sisi Chen, Jiawen Liu, Jie Mi, Junjie Liao, Jiancheng Wang, Mengmeng Wu · 发表于：Separation and Purification Technology · 年份：2025 · DOI：10.1016/j.seppur.2025.136350 · 被引用次数：2 · 研究领域：Industrial Gas Emission Control、Carbon Dioxide Capture Technologies、Chemical Looping and Thermochemical Processes

Supported sorbents for hot coal gas desulfurization are typically prepared via post-loading methods, which involve complex procedures and prolong synthesis time. Furthermore, achieving high-efficiency desulfurization with concurrent COS-release suppression remains a key challenge for supported sorbents. In this study, a facile one-pot microwave-assisted approach for concurrent self-assembly of MCM-41 support and incorporation of ZnO precursors was proposed for synthesis of sorbents. Key synthesis parameters including the sequence of Zn source addition, the type of Zn precursor, ZnO loading contents and the effect of microwave assistance were systematically investigated to reveal their influence on the structure and desulfurization performance of sorbents. Thereafter, dual-functional sorbents were designed and fabricated through in-situ incorporation of Ni/Co/Mo additives during one-pot process. As expected, the introduction of Ni/Co/Mo significantly reduced the amount of released COS (by 55.3 %–99.5 %). Moreover, Ni-modification also results in higher H 2 S-adsorption activity. In particular, sorbent with the Ni/Zn molar ratio of 1/30 exhibits the highest breakthrough sulfur capacity (15.1 × 10 −2 g S/g sorbent) along with excellent suppression of COS-release, and could also maintain good cyclic stability over multiple desulfurization–regeneration cycles. In addition, the analysis of COS-release suppression mechanism reveals that Ni-modification not only promotes the reactivi...