In this paper, Fe–Ce mixed oxides supported on lignite semi-coke were prepared by the hydrothermal impregnation method. The sorbents were employed to capture elemental mercury from coal pyrolysis gas. The influences of hydrothermal impregnation temperature, mole ratio of Fe/Ce, reaction temperature, and H₂S concentration on Hg⁰ removal efficiency were investigated in a fixed-bed reactor. The physicochemical properties of the sorbent samples were characterized by X-ray diffraction, Brunauer–Emmett–Teller, scanning electron microscopy, and X-ray photoelectron spectroscopy (XPS). The results showed that the Fe/Ce-modified semi-coke sorbents, synthesized by hydrothermal impregnated at 200 °C, had larger specific surface areas and pore volumes than the original semi-coke. The sorbent with a Fe/Ce molar ratio of 0.4:0.2 exhibited the highest Hg⁰ removal efficiency of 83.5% at 150 °C. On the basis of the XPS characterization of the sorbent, a mechanism of Hg⁰ removal over the Fe0.4Ce0.2/SC200 sorbent was proposed, suggesting that H₂S could react with Fe/Ce mixed to form active sulfur, with which Hg⁰ could react to form HgS. In addition, the stability and regeneration of the sorbent were also investigated.

中文翻译：

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水热浸渍法改性褐煤半焦负载Fe-Ce氧化物去除煤热解气中的元素汞

本文采用水热浸渍法制备了褐煤半焦负载的Fe-Ce复合氧化物。吸附剂用于从煤热解气中捕获元素汞。水热浸渍温度，Fe / Ce摩尔比，反应温度和H ₂ S浓度对Hg ^0的影响在固定床反应器中研究了去除效率。吸附剂样品的理化特性通过X射线衍射，Brunauer-Emmett-Teller，扫描电子显微镜和X射线光电子能谱（XPS）进行表征。结果表明，在200°C下水热浸渍合成的Fe / Ce改性半焦吸附剂比原始半焦具有更大的比表面积和孔体积。Fe / Ce摩尔比为0.4：0.2的吸附剂在150°C时显示出最高的Hg ⁰去除率83.5％。根据吸附剂的XPS表征，提出了通过Fe0.4Ce0.2 / SC200吸附剂去除Hg ⁰的机理，表明H ₂S与混合的Fe / Ce反应生成活性硫，Hg ⁰与之反应生成HgS。另外，还研究了吸附剂的稳定性和再生性。