Novel Fe-doped CePO4 (FexCe1-x) catalyst was firstly successfully synthesized via a simple co-precipitation method and demonstrated excellent NH3-SCR performance in comparison with FePO4 and CePO4. In order to study the promoting effects of Fe3+ ion on the NH3-SCR activity of CePO4 catalyst, various characterizations were conducted. It was found that NH3 capacity of FexCe1-x catalyst was controlled by P sites and depended on their specific surface area. Interestingly, Fe species in FexCe1-x were not a Lewis acid site for NH3 adsorption, but it could promote the activation of NH3. More importantly, Fe3+ doping could induce the redox equilibrium of Fe3+ + Ce3+ ⇆ Fe2+ + Ce4+, which significantly improved redox properties of CePO4 catalyst. Accordingly, improved catalytic activity of FexCe1-x catalysts could be attributed to the collective effects of the higher surface area, better redox properties and easily activated NH3. Among them, superior redox property of FexCe1-x catalysts was the main reason boosting their high catalytic activity. Finally, the reaction process analyzed by in situ DRIFT proposed that the NH3-SCR reaction over CePO4 and FexCe1-x occurred mainly via Eley-Rideal mechanism. We anticipated this work could promote the development of novel NH3-SCR catalyst.

中文翻译：

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新型Fe掺杂的CePO4催化剂，用于用NH3选择性催化还原NO：Fe3 +离子的作用。

首次通过简单的共沉淀方法成功合成了新型的Fe掺杂CePO4（FexCe1-x）催化剂，与FePO4和CePO4相比，NH3-SCR性能优异。为了研究Fe3 +离子对CePO4催化剂的NH3-SCR活性的促进作用，进行了各种表征。发现FexCe1-x催化剂的NH3容量受P位控制，并取决于它们的比表面积。有趣的是，FexCe1-x中的Fe物种不是用于NH3吸附的路易斯酸位点，但可以促进NH3的活化。更重要的是，Fe3 +掺杂可以诱导Fe3 + + Ce3 +⇆Fe2 + + Ce4 +的氧化还原平衡，从而显着提高CePO4催化剂的氧化还原性能。因此，FexCe1-x催化剂具有更高的催化活性，这归因于较高的表面积，更好的氧化还原特性和易于活化的NH3的共同作用。其中，FexCe1-x催化剂优异的氧化还原性能是提高其高催化活性的主要原因。最后，通过原位DRIFT分析的反应过程表明，CePO4和FexCe1-x上的NH3-SCR反应主要通过Eley-Rideal机理发生。我们预计这项工作可以促进新型NH3-SCR催化剂的开发。原位DRIFT分析的反应过程表明，CePO4和FexCe1-x上的NH3-SCR反应主要通过Eley-Rideal机理发生。我们预计这项工作可以促进新型NH3-SCR催化剂的开发。原位DRIFT分析的反应过程表明，CePO4和FexCe1-x上的NH3-SCR反应主要通过Eley-Rideal机理发生。我们预计这项工作可以促进新型NH3-SCR催化剂的开发。