Abstract A variety of Ce-Fe solid solutions was synthesized by a microwave hydrothermal method following the molar ratio of Fe and Ce in Bayan Obo rare earth concentrate, to evaluate the catalytic action of Fe and Ce in NH3-SCR denitrification reaction. The microstructure, surface properties and catalytic activity of CeO2-Fe2O3/Al2O3 catalyst samples were characterized by NH3-SCR, SEM, BET, NH3-TPD, XRD, Raman, XPS, and DRIFTS. The results showed that the adsorption capacity of NH3 is the strongest when the molar ratio of Ce-Fe was 1:0.35, and the catalytic activity is the highest, up to 90%. The increase of iron species is beneficial to the denitration performance of the catalysts. The structure of CeO2 is distorted to form the Ce-Fe solid solutions, and more oxygen vacancies in the catalysts were exposed. Activated nitrate was generated from NO under the action of Ce3+and Fe2+, which was converted to N2 and H2O with the amide.

中文翻译：

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基于稀土精矿的Ce-Fe固溶体的低温NH3-SCR催化特性

摘要 根据白云鄂博稀土精矿中Fe、Ce的摩尔比，采用微波水热法合成多种Ce-Fe固溶体，评价Fe、Ce对NH3-SCR脱硝反应的催化作用。通过NH3-SCR、SEM、BET、NH3-TPD、XRD、Raman、XPS和DRIFTS对CeO2-Fe2O3/Al2O3催化剂样品的微观结构、表面性质和催化活性进行了表征。结果表明,当Ce-Fe摩尔比为1:0.35时,NH3的吸附能力最强,催化活性最高,可达90%。铁物种的增加有利于催化剂的脱硝性能。CeO2的结构扭曲形成Ce-Fe固溶体，催化剂中更多的氧空位暴露出来。