| 水热老化对Cu改性的W/CeTi催化剂NH3-SCR性能的影响 | |
| Effect of hydrothermal aging on NH3-SCR performance of Cu-modified W/CeTi catalyst | |
| 摘要: 采用浸渍法制备了CuW/CeTi和W/CuCeTi催化剂，考察了催化剂中Cu的不同作用方式对氨气选择性催化还原NOx (NH3-SCR)反应脱硝性能的影响。新鲜的CuW/CeTi和W/CuCeTi在低温下显示出优异的活性。经过800℃、10 h水热老化后，W/CuCeTi表现出比CuW/CeTi更优异的脱硝性能，证明W/CuCeTi具有更高的水热稳定性。通过透射电子显微镜(TEM)、X射线衍射(XRD)、拉曼光谱(Raman)、N2物理吸附-脱附、X射线光电子能谱(XPS)、氨气程序升温脱附(NH3-TPD)和氢气程序升温还原(H2-TPR)表征，发现Cu的掺杂形成的Cu-O-Ce结构能够提高CeTi的抗烧结能力，同时削弱W-CeO2相互作用，抑制老化过程中Ce2(WO4)3物质的形成，使W/CuCeTi表现出更优异的水热稳定性。 | |
| 关键词: W/CuCeTi催化剂 NH3-SCR 水热老化 Ce2(WO4)3 | |
| 基金项目: 国家自然科学基金(No.22272132，22202160)，四川省自然科学基金(No.2022NSFSC1041)，四川省中央引导地方科技发展专项(No.2021ZYD0044)资助资助。 | |
| Abstract: CuW/CeTi and W/CuCeTi catalysts were prepared by impregnation method. The effects of different action modes of Cu on denitrification performance of NH3 selective catalytic reduction of NOx (NH3-SCR) reaction were investigated. Studies showed that fresh CuW/CeTi and W/CuCeTi exhibited excellent activity at low temperature. After 800 ℃ and 10 h hydrothermal aging, W/CuCeTi showed better denitration performance than CuW/CeTi, which proves that W/CuCeTi has higher hydrothermal stability. Then, these catalysts were characterized by transmission electron microscope (TEM), X - ray diffraction (XRD), Raman spectrum (Raman), N2 physical adsorption - desorption, X-ray photoelectron spectroscopy (XPS), ammonia temperature-programmed desorption (NH3-TPD) and hydrogen temperature-programmed reduction (H2-TPR). It was found that the Cu-O-Ce structure formed by Cu doping can improve the anti-sintering ability of CeTi, weaken the interaction of W-CeO2, and thus inhibits the formation of Ce2(WO4)3 in the aging process. Therefore, W/CuCeTi shows better hydrothermal stability. | |
| Keywords: W/CuCeTi catalyst NH3-SCR hydrothermal aging Ce2(WO4)3 | |
| 投稿时间：2023-04-24 修订日期：2023-08-27 | |
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| 高文翔,文婕,邓杰,徐海迪,陈永东.水热老化对Cu改性的W/CeTi催化剂NH3-SCR性能的影响[J].无机化学学报,2023,39(10):1877-1886. | |
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