Abstract H2S is a common impurity in the syngas derived from municipal solid waste gasification. For power generation using advanced technologies, such as gas engines/turbines or solid oxide fuel cells, reducing the H2S content to acceptable levels is required. This work investigated the desulfurization performance of bimetallic particles by adding different metals (Fe, Cr, Co, Ni) into ZnO-based nanocomposites. At 400 °C, the Co-ZnO demonstrated 26.3, 5.0, 1.7 times higher sulfur uptake from a model syngas (composed of 100 ppmv H2S, 15 vol% CO, 5 vol% CO2, 15 vol% H2, 15 vol% H2O and N2 (balance)) than pure ZnO, Cr-ZnO and Fe-ZnO, respectively. This could be attributed to the formation of p-n heterojunction between the n-type ZnO and p-type Co3O4, accelerating surface reaction kinetics. Although the Ni-ZnO showed a better performance at 400 °C, at an elevated temperature of 600 °C, the Co-ZnO demonstrated 1.2 times higher sulfur capacity compared to Ni-ZnO. Furthermore, the Co-ZnO nanocomposite was subjected to 3 cycles of high-temperature desulfurization (600 °C) and regeneration. The results showed that its high desulfurization efficiency was retained after the tests. This could enable a high-temperature desulfurization of hot syngas and hence an increase in the electrical efficiency of waste-to-energy facilities.

中文翻译：

---

用于高温合成气脱硫的可再生 Co-ZnO 基纳米复合材料

摘要 H2S是城市生活垃圾气化合成气中常见的杂质。对于使用先进技术（例如燃气发动机/涡轮机或固体氧化物燃料电池）的发电，需要将 H2S 含量降低到可接受的水平。本工作通过将不同金属（Fe、Cr、Co、Ni）添加到 ZnO 基纳米复合材料中来研究双金属颗粒的脱硫性能。在 400 °C 时，Co-ZnO 从模型合成气（由 100 ppmv H2S、15 vol% CO、5 vol% CO2、15 vol% H2、15 vol% H2O 和N2（余量））分别高于纯 ZnO、Cr-ZnO 和 Fe-ZnO。这可能是由于在 n 型 ZnO 和 p 型 Co3O4 之间形成了 pn 异质结，加速了表面反应动力学。尽管 Ni-ZnO 在 400 °C 时表现出更好的性能，在 600 °C 的高温下，Co-ZnO 的硫容量是 Ni-ZnO 的 1.2 倍。此外，Co-ZnO纳米复合材料经过3次高温脱硫（600℃）和再生循环。结果表明，经试验后仍保持较高的脱硫效率。这可以实现热合成气的高温脱硫，从而提高垃圾发电设施的电力效率。