Collaborative Innovation Center of Chemistry for Energy Materials, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
J Environ Sci (China). 2025 Apr;150:332-339. doi: 10.1016/j.jes.2024.03.016. Epub 2024 Mar 26.
NH-SCR (SCR: Selective catalytic reduction) is an effective technology for the de-NO process from both mobile and stationary pollution sources, and the most commonly used catalysts are the vanadia-based catalysts. An innovative VO-CeO/TaTiO catalyst for NO removal was prepared in this study. The influences of Ce and Ta in the VO-CeO/TaTiO catalyst on the SCR performance and physicochemical properties were investigated. The VO-CeO/TaTiO catalyst not only exhibited excellent SCR activity in a wide temperature window, but also presented strong resistance to HO and SO at 275 ℃. A series of characterization methods was used to study the catalysts, including H-temperature programmed reduction, X-ray photoelectron spectroscopy, NH-temperature programmed desorption, etc. It was discovered that a synergistic effect existed between Ce and Ta species. The introduction of Ce and Ta enlarged the specific surface area, increased the amount of acid sites and the ratio of Ce, (V+V) and O, and strengthened the redox capability which were related to synergistic effect between Ce and Ta species, significantly improving the NH-SCR activity.
NH-SCR（选择性催化还原）是一种从移动和固定污染源脱除 NO 的有效技术，最常用的催化剂是基于 V 的催化剂。本研究制备了一种用于 NO 去除的创新 VO-CeO/TaTiO 催化剂。研究了 Ce 和 Ta 在 VO-CeO/TaTiO 催化剂中的存在对 SCR 性能和物理化学性质的影响。VO-CeO/TaTiO 催化剂不仅在较宽的温度窗口内表现出优异的 SCR 活性，而且在 275℃下还具有很强的抗 HO 和 SO 能力。采用一系列表征方法对催化剂进行了研究，包括 H-程序升温还原、X 射线光电子能谱、NH-程序升温脱附等。发现 Ce 和 Ta 物种之间存在协同效应。Ce 和 Ta 的引入扩大了比表面积，增加了酸位数量和 Ce、（V+V）和 O 的比例，增强了与 Ce 和 Ta 物种协同效应相关的氧化还原能力，显著提高了 NH-SCR 活性。
