title: Enhanced Performance of Ceria-Based NOxReduction Catalysts by Optimal Support Effect.
abstract: CeO2-based catalysts have attracted widespread attention in environmental-protection applications, including selective catalytic reduction (SCR) of NO by NH3, and their catalytic performance is often intimately associated with the supports used. However, the issue of how to choose the supports of such catalysts still remains unresolved. Herein, we systematically study the support effect in SCR over CeO2-based catalysts by using three representative supports, Al2O3, TiO2, and hexagonal WO3(HWO), with different acidic and redox properties. HWO, with both acidic and reducible properties, achieves an optimal support effect; that is, CeO2/HWO exhibits higher catalytic activity than CeO2supported on acidic Al2O3or reducible TiO2. Transmission electron microscopy and X-ray diffraction techniques demonstrate that acidic supports (HWO and Al2O3) are favorable for the dispersion of CeO2on their surfaces. X-ray photoelectron spectroscopy coupled with theoretical calculations reveals that reducible supports (HWO and TiO2) facilitate strong electronic CeO2-support interactions. Hence, the excellent catalytic performance of CeO2/HWO is mainly ascribed to the high dispersion of CeO2and the optimal electronic CeO2-support interactions. This work shows that abundant Brønsted acid sites and excellent redox ability of supports are two critical requirements for the design of efficient CeO2-based catalysts.
authors.affiliation: Institute of Atmospheric Sciences, Shanghai Key Laboratory of Atmospheric Particle Pollution & Prevention, Department of Environmental Science & Engineering, Fudan University , Shanghai 200433, China.
authors.forename: Junxiao
authors.initials: J
authors.lastname: Chen
authors.affiliation: Institute of Atmospheric Sciences, Shanghai Key Laboratory of Atmospheric Particle Pollution & Prevention, Department of Environmental Science & Engineering, Fudan University , Shanghai 200433, China.
authors.forename: Yaxin
authors.initials: Y
authors.lastname: Chen
authors.affiliation: Institute of Atmospheric Sciences, Shanghai Key Laboratory of Atmospheric Particle Pollution & Prevention, Department of Environmental Science & Engineering, Fudan University , Shanghai 200433, China.
authors.forename: Meijuan
authors.initials: M
authors.lastname: Zhou
authors.affiliation: Institute of Atmospheric Sciences, Shanghai Key Laboratory of Atmospheric Particle Pollution & Prevention, Department of Environmental Science & Engineering, Fudan University , Shanghai 200433, China.
authors.forename: Zhiwei
authors.initials: Z
authors.lastname: Huang
authors.affiliation: Institute of Atmospheric Sciences, Shanghai Key Laboratory of Atmospheric Particle Pollution & Prevention, Department of Environmental Science & Engineering, Fudan University , Shanghai 200433, China.
authors.forename: Jiayi
authors.initials: J
authors.lastname: Gao
authors.affiliation: Institute of Atmospheric Sciences, Shanghai Key Laboratory of Atmospheric Particle Pollution & Prevention, Department of Environmental Science & Engineering, Fudan University , Shanghai 200433, China.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Ma
authors.affiliation: Institute of Atmospheric Sciences, Shanghai Key Laboratory of Atmospheric Particle Pollution & Prevention, Department of Environmental Science & Engineering, Fudan University , Shanghai 200433, China.
authors.forename: Jianmin
authors.initials: J
authors.lastname: Chen
authors.affiliation: Institute of Atmospheric Sciences, Shanghai Key Laboratory of Atmospheric Particle Pollution & Prevention, Department of Environmental Science & Engineering, Fudan University , Shanghai 200433, China.|Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing University of Information Science & Technology , Nanjing 210044, China.
authors.forename: Xingfu
authors.identifier: 0000-0002-0746-1294
authors.initials: X
authors.lastname: Tang
mesh_terms: D000641:Ammonia / Q000737:chemistry*; D002384:Catalysis; D002563:Cerium / Q000737:chemistry*; D056951:Photoelectron Spectroscopy; D014961:X-Ray Diffraction
chemical_list: D002563:Cerium; D000641:Ammonia