| 共沉淀法和浸渍法制备的HoCeMn/TiO2催化剂的脱硝性能 |
| Denitration performance of HoCeMn/TiO2 catalysts prepared by co-precipitation and impregnation methods |
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| 摘要: 采用浸渍法和共沉淀法制备了HoCeMn/TiO2脱硝催化剂并对其结构和性能进行了表征。结果表明共沉淀法增强了活性组分和载体的相互作用，从而增加了HoCeMnTi-C催化剂表面Ce3+、Mn4+以及吸附氧的含量，使其表现出优异的低温氧化还原性能。此外，共沉淀法制备的HoCeMnTi-C具有更多的表面酸性位点及更强的表面酸性。催化剂表面酸性和氧化还原性能的提高有助于氨的吸附和活化，从而显著提高其活性。表面酸性位点的增多还抑制了H2O和SO2在催化剂表面的吸附，提升了催化剂的抗水抗硫性能。催化剂上的选择性催化还原（SCR）反应遵循Eley-Rideal （E-R）机制，催化剂硫中毒是源于形成的硫酸盐覆盖或破坏了催化剂活性位。 |
| 关键词: HoCeMn/TiO2催化剂 活性 抗水抗硫性能 |
| 基金项目: |
| Abstract: Impregnation and co-precipitation methods were used to synthesize HoCeMn/TiO2 catalysts for the reduction of NOx with NH3. Different kinds of characterization methods were used to explore the structures and performances of the catalysts. The results show that the co-precipitation method enhances the interactivity between the active component and carrier, thereby increasing the content of Ce3+, Mn4+, and adsorption oxygen on the surface of HoCeMnTi-C. As a result, it showed excellent low-temperature redox performance. In addition, HoCeMnTi-C prepared by the co-precipitation method possessed more surface acidic sites and stronger surface acidity. The improvement of surface acidity and redox performance is conducive to the adsorption and activation of ammonia, and thereby significantly improved its activity. The increase of acidic sites also restrained the adsorption of H2O and SO2, and therefore sulfur and water resistance of HoCeMnTi-C were significantly promoted. The reaction of selective catalytic reduction (SCR) on catalysts obeys the Eley-Rideal (E-R) mechanism. SO2 poisoning of catalysts was caused by the formation of sulfates, which cover or damage the active sites of the catalysts. |
| Keywords: HoCeMn/TiO2 catalyst activity water and sulfur resistance |
| 投稿时间：2023-08-19 修订日期：2024-01-05 |
| 摘要点击次数: 932 |
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| 黄利华,华坚.共沉淀法和浸渍法制备的HoCeMn/TiO2催化剂的脱硝性能[J].无机化学学报,2024,40(3):629-645. |
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