Sulfur-release effect impedes the engineering application of hot coal gas desulfurization. However, the related mechanism is not clear. This study aims to clarify the aforementioned effects and directionally design/fabricate ordered mesoporous Zn-based sorbents with function of inhibiting sulfur-release behavior. The results reveal that COS is mainly formed via R-1 (reaction between CO and H₂S) before the reaction gas contacts Zn-based sorbents. R-2 (reaction between CO₂ and H₂S) catalyzed by ZnS is more kinetically favorable than its non-catalytic process. Furthermore, R-1 and R-2 contribute almost equally to the overall amount of released COS during desulfurization process. Then, considering the composition of coal gas, the strategy of promoter (with function of catalytic hydrogenolysis of COS) modification was proposed to inhibit sulfur-release behavior. A series of functionalized sorbents with four Zn/Me (Me: Mo, Ni) molar ratios (88:12–97:3) were constructed. The sorbents exhibit ordered pore-arrangement structure. Compared to unmodified sorbents, Mo- and Ni-doping both result in significant decline (by 98 %−99 %) in the amount of released COS before H₂S-breakthrough. Moreover, the doping of Mo/Ni into ZnO generally produces positive effects on H₂S-uptake activity. However, regeneration leads to notable deterioration of performance for Mo-doped sorbents. It is ascribed to the inadequate conversion of ZnS and structure destruction of sorbents. On the contrast, Ni-doped sorbents with Zn/Ni molar ratio of 90:10 could not only greatly suppress the sulfur-release effect and but also maintain 92 %−95 % of initial sulfur capacity during five sulfidation-regeneration cycles.

释硫效应阻碍了热煤气脱硫的工程应用。但相关机制尚不清楚。本研究旨在阐明上述效应，并定向设计/制造具有抑制硫释放行为功能的有序介孔锌基吸附剂。结果表明，在反应气体接触锌基吸附剂之前， COS主要通过R-1（CO和H _{2 S之间的反应）形成。}ZnS催化的R-2（CO ₂和H ₂ S之间的反应）比其非催化过程在动力学上更有利。此外，R-1和R-2对脱硫过程中释放的COS总量的贡献几乎相等。然后，考虑煤气的组成，提出了促进剂（具有COS催化氢解作用）改性策略来抑制释硫行为。构建了一系列具有四种 Zn/Me (Me: Mo, Ni) 摩尔比 (88:12–97:3) 的功能化吸附剂。吸附剂表现出有序的孔排列结构。_{与未改性的吸附剂相比，Mo 和 Ni 掺杂均导致 H 2} S 突破之前释放的 COS 量显着下降（下降 98%−99%） 。此外，将Mo/Ni掺杂到ZnO中通常会对H ₂ S吸收活性产生积极影响。然而，再生会导致掺钼吸附剂的性能显着恶化。这是由于 ZnS 转化不足和吸附剂结构破坏造成的。相比之下，Zn/Ni摩尔比为90:10的Ni掺杂吸附剂不仅可以极大地抑制硫释放效应，而且在五个硫化-再生循环中仍能保持92%−95%的初始硫容量。