负载不同杂多酸的 CeO 用于 NH 选择性催化还原 NO。
CeO grafted with different heteropoly acids for selective catalytic reduction of NO with NH.
机构信息
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.
出版信息
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。
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