Jiangsu Key Laboratory of Anaerobic Biotechnology, School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122 PR China; Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094 PR China; Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109, USA.
Jiangsu Key Laboratory of Anaerobic Biotechnology, School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122 PR China.
J Hazard Mater. 2020 Jan 15;382:121032. doi: 10.1016/j.jhazmat.2019.121032. Epub 2019 Aug 17.
The CeO catalysts grafted with heteropoly acid (i.e., HPA) could enhance their catalytic performance for selective catalytic reduction of NO with NH (NH-SCR). In comparison to HSiW/CeO, HPMo/CeO, and commercial VO-WO/TiO catalysts, HPW/CeO catalysts showed the best SCR performance. XPS and DRIFTS demonstrated that the amount of HPA on HPW/CeO was more than those on HSiW/CeO and HPMo/CeO. H-TPR results indicated that reducibility of HPMo/CeO was stronger than those of HSiW/CeO and HPW/CeO, resulting in the high-temperature performance loss. According to kinetic results, below 250 °C, k and k of HPW/CeO were higher than those of HSiW/CeO, meanwhile k of both HSiW/CeO and HPW/CeO were low. Therefore, HPW/CeO had the better SCR performance than HSiW/CeO. As NH was completely consumed, SCR activity depended on the ratio of SCR reaction in the consumption of NH. The selectivity of SCR reaction, NSCR reaction, and C-O reaction of HSiW/CeO were almost the same as those of HPW/CeO above 250 °C, resulting in the NO conversion of HPW/CeO was basically the same as that of HSiW/CeO above 250 °C. Due to the lowest k and k, and highest k, NO conversion of HPMo/CeO was the worst compared to HSiW/CeO and HPW/CeO catalysts.
负载杂多酸（即 HPA）的 CeO 催化剂可以提高其用于选择性催化还原 NO 与 NH（NH-SCR）的催化性能。与 HSiW/CeO、HPMo/CeO 和商业 VO-WO/TiO 催化剂相比，HPW/CeO 催化剂表现出最佳的 SCR 性能。XPS 和 DRIFTS 表明，HPW/CeO 上 HPA 的量多于 HSiW/CeO 和 HPMo/CeO。H-TPR 结果表明，HPMo/CeO 的还原能力强于 HSiW/CeO 和 HPW/CeO，导致高温性能损失。根据动力学结果，在 250°C 以下，HPW/CeO 的 k 和 k 高于 HSiW/CeO，同时 HSiW/CeO 和 HPW/CeO 的 k 都较低。因此，HPW/CeO 的 SCR 性能优于 HSiW/CeO。当 NH 完全消耗时，SCR 活性取决于 NH 消耗中的 SCR 反应比例。在 250°C 以上，HSiW/CeO 和 HPW/CeO 的 SCR 反应、NSCR 反应和 C-O 反应的选择性几乎相同，导致 HPW/CeO 的 NO 转化率基本与 HSiW/CeO 相同。由于 k 和 k 最低，k 最高，与 HSiW/CeO 和 HPW/CeO 催化剂相比，HPMo/CeO 的 NO 转化率最差。
