The promoting effect of Ce on V-W/Ti catalyst for selective catalytic reduction (SCR) of NOx by NH3 was studied. Compared with the original V-W/Ti samples, addition of Ce contributed better NH3-SCR performance. The H2O and SO2 resistance of Ce modified V-W/Ti catalyst was improved by the different impregnation sequence of Ce. The catalysts were characterized by NH3-temperature programmed desorption (NH3-TPD), X-ray photoelectron spectroscopy (XPS), and H2-temperature programmed reduction (H2-TPR) techniques. The results showed that the impregnation sequence of W and Ce influenced the NH3 adsorption capacity of the catalysts. In comparison to 0.2V-5Ce-5W/Ti and 0.2V-(5Ce5W)/Ti, 0.2V-5W-5Ce/Ti catalyst contributed better H2O and SO2 resistance, with the highest Ce3+/(Ce4+ + Ce3+) value of 36.6%. Besides, a catalytic mechanism of SCR reactions over Ce-doped V-W/Ti catalysts was proposed.

中文翻译：

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具有低钒负载量的 Ce 掺杂 V2O5-WO3/TiO2 作为 SCR 催化剂以及耐 H2O 和 SO2

研究了Ce对VW/Ti催化剂NH3选择性催化还原(SCR)NOx的促进作用。与原始 VW/Ti 样品相比，添加 Ce 有助于更好的 NH3-SCR 性能。Ce改性VW/Ti催化剂的H2O和SO2抗性通过Ce的不同浸渍顺序提高。催化剂通过NH3-程序升温脱附(NH3-TPD)、X射线光电子能谱(XPS)和H2-程序升温还原(H2-TPR)技术表征。结果表明，W和Ce的浸渍顺序影响催化剂的NH3吸附能力。与 0.2V-5Ce-5W/Ti 和 0.2V-(5Ce5W)/Ti 相比，0.2V-5W-5Ce/Ti 催化剂对 H2O 和 SO2 的耐受性更好，最高 Ce3+/(Ce4+ + Ce3+) 值为 36.6 %。除了，