A desirable catalyst with excellent SO/HO tolerance at low temperatures is of great significance for NO removal from actual flue gas. Defect engineering and metal confinement on metal oxide surfaces have emerged as effective strategies to enhance catalyst selectivity and activity. Herein, a Mn-based catalyst (CeCoMn/TiO) with metal and oxygen vacancies was constructed by high-energy ball milling. The catalyst exhibited superior SO/HO tolerance stability (70.8 %) at 180 ℃ and 40000 h than that prepared by the impregnation method (43.5 %). Metal vacancies can serve as anchor sites to generate well-dispersed active centers, and oxygen vacancies facilitate gas-phase oxygen replenishment and electron transfer. The synergistic effect of metal vacancies and oxygen vacancies improved the activity of the catalyst. infrared and theoretical calculations reveal that the reaction mechanism follows the Langmuir-Hinshelwood pathway. The catalyst prepared by ball milling has better SO/HO tolerance due to stronger acidity and interaction. The synergistic effect of dual-defect found in this study may guide the development of superior anti-poisoning catalysts.

中文翻译：

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二氧化钛上的缺陷工程和金属限制增强了 NOx 还原中 SO2/H2O 的耐受性：氧和金属空位

一种在低温下具有优异的SO/H2O耐受性的理想催化剂对于实际烟气中NO的脱除具有重要意义。金属氧化物表面的缺陷工程和金属限制已成为提高催化剂选择性和活性的有效策略。在此，通过高能球磨构建了具有金属和氧空位的锰基催化剂（CeCoMn/TiO）。该催化剂在180℃、40000h下表现出比浸渍法制备的催化剂（43.5%）更优异的SO/H2O耐受稳定性（70.8%）。金属空位可以作为锚定位点，产生分散良好的活性中心，氧空位有利于气相氧补充和电子转移。金属空位和氧空位的协同作用提高了催化剂的活性。红外和理论计算表明反应机理遵循Langmuir-Hinshelwood途径。球磨制备的催化剂由于较强的酸性和相互作用而具有更好的SO/H2O耐受性。本研究发现的双重缺陷的协同效应可能会指导开发优异的抗中毒催化剂。