期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 383, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2019.121212
关键词
Fe doped; CePO4; Redox property; Acid sites; NH3-SCR
资金
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX18_0445]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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+ reversible arrow 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.
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