Abstract A series of rare earth Keggin-type tungstophosphorate doped iron oxide catalysts were prepared by physical mixing method. The effects of type and the content of rare earth element over NH 3 -SCR activity were investigated and the catalysts were characterized by FT-IR, XRD, SEM, EDS, XPS, BET, TGA, ICP-AES, H 2 -TPR and NH 3 -TPD. It is indicated that the addition of rare earth Keggin-type tungstophosphorate could increase the NH 3 -SCR activity of the iron oxide catalysts, while the effect of rare earth species on SCR activity over Fe y O x is not obvious. Effects of O 2 concentration, SO 2 and SO 2 + H 2 O on NH 3 -SCR activity over NdPW/Fe y O x(25) and the control experiments were also investigated, the results of which illustrates that O 2 exerts a significant promotion effect on the SCR reaction and the impact of SO 2 (470 ppm) on catalytic activity is almost negligible. NdPW/Fe y O x(25) presents appealing properties of hydrothermal stability and SO 2 -tolerance, and exhibits a great potential in practical applications.

中文翻译：

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负载在氧化铁上的 12-钨磷酸稀土盐作为选择性催化还原 NOx 的催化剂

摘要 采用物理混合法制备了一系列稀土Keggin型磷钨酸掺杂氧化铁催化剂。考察了稀土元素的种类和含量对NH 3 -SCR活性的影响，并通过FT-IR、XRD、SEM、EDS、XPS、BET、TGA、ICP-AES、H 2 -TPR和NH 3 -TPD。表明稀土Keggin型磷钨酸盐的加入可以提高氧化铁催化剂的NH 3 -SCR活性，而稀土种类对Fe y O x SCR活性的影响不明显。还研究了O 2 浓度、SO 2 和SO 2 + H 2 O 对NdPW/Fe y O x(25) 上NH 3 -SCR 活性的影响和对照实验，结果表明，O 2 对SCR反应有显着的促进作用，SO 2 (470 ppm)对催化活性的影响几乎可以忽略不计。NdPW/Fe y O x(25) 具有吸引人的水热稳定性和 SO 2 耐受性，在实际应用中具有巨大的潜力。