Abstract Fe-based catalysts have a great potential to be used for selective catalytic reduction (SCR) of NOx with NH3 reaction due to their low cost, nontoxicity and excellent catalytic activity. The aim of this paper is to investigate Ce doping effect on activity of NH3-SCR over the FeOx/TiO2 catalyst. In-situ diffuse reflectance infrared fourier transform (DRIFT) technology has been utilized to verify the adsorbed species on the surface of FeOx/TiO2 and FeOx-CeO2/TiO2 catalysts. With respect to the obtained results, among the four catalysts studied, the FeOx-CeO2/TiO2 with the FeOx/CeO2 ratio of 3/8 showed the best NO conversion more than 98% in the temperature range of 230−350°C. The active centers for NH3 adsorption and activation were assigned to Lewis acid sites over the FeOx-CeO2/TiO2 and monodentate nitrates could act as the key intermediate in the NH3-SCR. Moreover, both of Langmuir‐Hinshelwood and Eley‐Rideal mechanisms have been observed over of the FeOx-CeO2/TiO2 catalysts in the SCR.

中文翻译：

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铈对 Feo / TiO2 催化剂对 NH3 选择性催化还原 NO 的强化作用的原位 DRIFT 评估

摘要 铁基催化剂由于其低成本、无毒和优异的催化活性，在用NH3反应选择性催化还原（SCR）NOx方面具有巨大的潜力。本文的目的是研究 Ce 掺杂对 FeOx/TiO2 催化剂上 NH3-SCR 活性的影响。原位漫反射红外傅里叶变换 (DRIFT) 技术已被用于验证 FeOx/TiO2 和 FeOx-CeO2/TiO2 催化剂表面的吸附物质。就所得结果而言，在研究的四种催化剂中，FeOx/CeO2 比为 3/8 的 FeOx-CeO2/TiO2 在 230-350°C 的温度范围内表现出最佳的 NO 转化率超过 98%。NH3 吸附和活化的活性中心被指定为 FeOx-CeO2/TiO2 上的路易斯酸位点，单齿硝酸盐可以作为 NH3-SCR 的关键中间体。此外，在 SCR 中的 FeOx-CeO2/TiO2 催化剂上已经观察到 Langmuir-Hinshelwood 和 Eley-Rideal 机制。