title: Pt-Doped NiFe₂O₄ Spinel as a Highly Efficient Catalyst for H₂ Selective Catalytic Reduction of NO at Room Temperature.
abstract: H2 selective catalytic reduction (H2-SCR) has been proposed as a promising technology for controlling NOx emission because hydrogen is clean and does not emit greenhouse gases. We demonstrate that Pt doped into a nickel ferrite spinel structure can afford a high catalytic activity of H2-SCR. A superior NO conversion of 96% can be achieved by employing a novel NiFe1.95Pt0.05O4 spinel-type catalyst at 60 °C. This novel catalyst is different from traditional H2-SCR catalysts, which focus on the role of metallic Pt species and neglect the effect of oxidized Pt states in the reduction of NO. The obtained Raman and XPS spectra indicate that Pt in the spinel lattice has different valence states with Pt(2+) occupying the tetrahedral sites and Pt(4+) residing in the octahedral ones. These oxidation states of Pt enhance the back-donation process, and the lack of filling electrons of the 5d band causes Pt to more readily hybridize with the 5σ orbital of the NO molecule, especially for octahedral Pt(4+), which enhances the NO chemisorption on the Pt sites. We also performed DFT calculations to confirm the enhancement of adsorption of NO onto Pt sites when doped into the Ni-Fe spinel structure. The prepared Pt/Ni-Fe catalysts indicate that increasing the dispersity of Pt on the surfaces of the individual Ni-Fe spinel-type catalysts can efficiently promote the H2-SCR activity. Our demonstration provides new insight into designing advanced catalysts for H2-SCR.
authors.affiliation: School of Resources and Environmental Engineering, State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process and ‡Key Laboratory for Advanced Materials, Center for Computational Chemistry and Research Institute of Industrial Catalysis, East China University of Science and Technology , 130 Meilong Road, Shanghai 200237, P. R. China.
authors.forename: Wei
authors.initials: W
authors.lastname: Sun
authors.affiliation: School of Resources and Environmental Engineering, State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process and ‡Key Laboratory for Advanced Materials, Center for Computational Chemistry and Research Institute of Industrial Catalysis, East China University of Science and Technology , 130 Meilong Road, Shanghai 200237, P. R. China.
authors.forename: Kai
authors.initials: K
authors.lastname: Qiao
authors.affiliation: School of Resources and Environmental Engineering, State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process and ‡Key Laboratory for Advanced Materials, Center for Computational Chemistry and Research Institute of Industrial Catalysis, East China University of Science and Technology , 130 Meilong Road, Shanghai 200237, P. R. China.
authors.forename: Ji-Yuan
authors.initials: JY
authors.lastname: Liu
authors.affiliation: School of Resources and Environmental Engineering, State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process and ‡Key Laboratory for Advanced Materials, Center for Computational Chemistry and Research Institute of Industrial Catalysis, East China University of Science and Technology , 130 Meilong Road, Shanghai 200237, P. R. China.
authors.forename: Li-Mei
authors.initials: LM
authors.lastname: Cao
authors.affiliation: School of Resources and Environmental Engineering, State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process and ‡Key Laboratory for Advanced Materials, Center for Computational Chemistry and Research Institute of Industrial Catalysis, East China University of Science and Technology , 130 Meilong Road, Shanghai 200237, P. R. China.
authors.forename: Xue-Qing
authors.initials: XQ
authors.lastname: Gong
authors.affiliation: School of Resources and Environmental Engineering, State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process and ‡Key Laboratory for Advanced Materials, Center for Computational Chemistry and Research Institute of Industrial Catalysis, East China University of Science and Technology , 130 Meilong Road, Shanghai 200237, P. R. China.
authors.forename: Ji
authors.initials: J
authors.lastname: Yang
mesh_terms: D002384:Catalysis; D020650:Combinatorial Chemistry Techniques; D006859:Hydrogen / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry*; D009569:Nitric Oxide / Q000737:chemistry*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry*; D010984:Platinum / Q000737:chemistry*; D011789:Quantum Theory; D013696:Temperature
chemical_list: D009569:Nitric Oxide; D010984:Platinum; D009532:Nickel; D006859:Hydrogen; D007501:Iron; D010100:Oxygen
keywords: H2-SCR; NO adsorption; Pt; nickel ferrite spinel