| Cu/Al2O3低温催化氧化H2S研究 |
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| 引用本文： | 尹梦雪,樊飞跃,赵龙,侯红.Cu/Al2O3低温催化氧化H2S研究[J].环境科学研究,2021,34(5):1071-1078. |
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| 作者姓名： | 尹梦雪 樊飞跃 赵龙 侯红 |
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| 作者单位： | 中国环境科学研究院, 环境基准与风险评估国家重点实验室, 北京 100012 |
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| 基金项目： | 国家重点研发计划项目2020YFC1807700 |
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| 摘 要： | 高效低成本的催化剂是低温催化氧化脱除硫化氢（H2S）的研究重点，采用浸渍法研制了Cu/Al2O3催化剂，利用N2物理吸附、XRD（X射线衍射分析）、XPS（光电子能谱）、FT-IR（傅里叶变换红外光谱）等表征手段了解催化剂的表面结构和物相结构，并开展不同温度、相对湿度、Cu负载量条件下的H2S动态脱附以考察催化剂脱硫性能.结果表明:①催化剂是一种典型的介孔材料，且CuO和Cu2O高度分散在催化剂表面.②FT-IR结果表明，催化剂在H2S催化氧化过程中表面CuxO和表面结合水中的羟基均参与反应，且有SO42-的生成.③XRD、XPS结果表明，脱硫过程中有S单质和CuS的生成.④适宜的温度（50℃）和相对湿度（50%）会显著增强Cu基催化剂的脱硫性能.⑤负载量为3%的Cu基催化剂具有最佳的脱硫性能，穿透硫容量高达220.92 mg/g.研究显示，利用浸渍法可以合成低温催化氧化H2S的高硫容Cu基催化剂.
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| 关 键 词： | 硫化氢 催化 硫容量 Cu基催化剂 |
| 收稿时间： | 2020-09-22 |
Catalytic Oxidation of H2S by Cu/Al2O3 at Low Temperature |
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| Affiliation: | State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China |
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| Abstract: | High-efficiency and low-cost catalysts are the research focus of removing hydrogen sulfide (H2S) by catalytic oxidation at low temperature. The Cu/Al2O3 catalyst was prepared by impregnation. The structural characteristics of the catalysts were analyzed by N2 physical adsorption, XRD (X-ray diffraction), XPS (X-ray photoelectron spectroscopy) and FT-IR (Fourier Transform infrared spectroscopy). And dynamic desorption experiments of H2S at different temperatures, humidity and Cu loadings were carried out to investigate the desulfurization performance of the catalyst. The results show that: (1) The catalyst was a typical mesoporous material, and CuO and Cu2O were highly dispersed on the catalyst surface. (2) CuxO on the catalyst surface and hydroxyl on the surface water participated in the catalytic oxidation of H2S to SO42-. (3) Elemental S and CuS were formed during the desulfurization. (4) Appropriate temperature and humidity (50℃, relative humidity 50%) significantly enhanced the desulfurization performance of the Cu-based catalysts. (5) The Cu-based catalyst with a loading of 3% had the best desulfurization performance, and its breakthrough sulfur capacity was as high as 220.92 mg/g. The results indicate that the Cu-based catalysts with high sulfur capacity for catalytic oxidation of hydrogen sulfide at low temperature can be synthesized by impregnation method. This study offers an effective and feasible method for the treatment of odor. |
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