采用3种不同的浸渍过程制备了系列 WO3改性 MnOx/TiO2催化剂,并采用 BET 比表面积测试、X 射线衍射、拉曼光谱、H2程序升温还原、高分辨扫描电镜和原位红外光谱等技术进行表征.结果显示,一步浸渍法和先钨后锰的分布浸渍法制备的催化剂中, Mn 和 W 的协同作用提高了活性组分的分散状态,并阻止了钛载体的转晶;在所有的 Mn 基催化剂中, Mn 物种主要以Mn2O3形式存在,但在15%MnOx-5%WO3/TiO2中出现了少量的 MnO2; WO3的加入大大增强了催化剂的还原能力,提高了其表面酸位尤其是 B 酸的数量与强度,并促进了活性中间物(-NH2)的生成.表面 Lewis 酸在低温 SCR 反应起主要作用,并且发现-NH2也是活性很高的物种.在 NH3低温催化还原 NO 的反应中,一步浸渍法制备的催化剂活性最高.
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