Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing, PR China; School of Energy and Power Engineering, Chongqing University, Chongqing, 400044, PR China.
Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing, PR China; School of Energy and Power Engineering, Chongqing University, Chongqing, 400044, PR China.
Chemosphere. 2022 Mar;291(Pt 3):133047. doi: 10.1016/j.chemosphere.2021.133047. Epub 2021 Nov 23.
3% Fe/AlO and 3% Fe/AlO@SiO were prepared to investigate the performance in simultaneous removal of NO and SO using vaporized HO. Certain paraments were changed to explore the activity of catalysts, including temperature, HO concentration, GHSV and coexistence gases component. A 24-h durability test was conducted on 3% Fe/AlO@SiO. Moreover, a series of characterizations were employed to analyze the physical and chemical properties of catalysts, including XRD, BET, SEM, TEM, FTIR and XPS. Compared with 3% Fe/AlO, 3% Fe/AlO@SiO exhibited more excellent catalytic activity, which could achieve the peak removal efficiency of 100% for SO and 93.76% for NO. Moreover, 3% Fe/AlO@SiO kept stable simultaneous removal efficiency in a 24-h test. The characterization results indicated that the BET area was greatly improved and the core-shell structure was synthesized with the formation of more micropores and mesopores by the coating of SiO, which could improve the activity of catalyst at high temperature and high SO concentration. Besides, the mechanism of SO molecules on simultaneous removal was investigated. On one hand, a part of HO was consumed by SO molecules without catalyst, which resulted in the drop of NO removal by the decrease of oxidants. The main products were sulfites and bisulfites, which were broken down into SO over the catalyst. On the other hand, the presence of SO was beneficial for NO removal by increasing oxygen vacancies on the catalyst surface and facilitating the absorption of NO by NaOH solution.
采用水蒸气同时脱除 NO 和 SO，制备了 3%Fe/AlO 和 3%Fe/AlO@SiO，考察了催化剂的性能。改变了一些参数，包括温度、水蒸气浓度、空速和共存气体组分，以探索催化剂的活性。在 3%Fe/AlO@SiO 上进行了 24 h 的耐久性测试。此外，还采用了一系列表征方法来分析催化剂的物理化学性质，包括 XRD、BET、SEM、TEM、FTIR 和 XPS。与 3%Fe/AlO 相比，3%Fe/AlO@SiO 表现出更优异的催化活性，可达到 SO 去除率峰值 100%和 NO 去除率 93.76%。此外，3%Fe/AlO@SiO 在 24 h 测试中保持稳定的同时去除效率。表征结果表明，通过 SiO 的包覆，BET 面积大大提高，合成了核壳结构，形成了更多的微孔和介孔，从而提高了催化剂在高温和高 SO 浓度下的活性。此外，还研究了 SO 分子同时去除的机理。一方面，一部分水蒸气被 SO 分子消耗，导致氧化剂减少，NO 去除率下降。主要产物是亚硫酸盐和亚硫酸氢盐，它们在催化剂上分解成 SO。另一方面，SO 的存在有利于通过增加催化剂表面的氧空位和促进 NaOH 溶液对 NO 的吸收来去除 NO。
