title: Surface-confined atomic silver centers catalyzing formaldehyde oxidation.
abstract: Formaldehyde (HCHO) is a prior pollutant in both indoor and outdoor air, and catalytic oxidation proves the most promising technology for HCHO abatement. For this purpose, supported metal catalysts with single silver atoms confined at 4-fold O4-terminated surface hollow sites of a hollandite manganese oxide (HMO) as catalytic centers were synthesized and investigated in the complete oxidation of HCHO. Synchrotron X-ray diffraction patterns, X-ray absorption spectra, and electron diffraction tomography revealed that geometric structures and electronic states of the catalytic centers were tuned by the changes of HMO structures via controllable metal-support interactions. The catalytic tests demonstrated that the catalytically active centers with high electronic density of states and strong redox ability are favorable for enhancement of the catalytic efficiency in the HCHO oxidation. This work provides a strategy for designing efficient oxidation catalysts for controlling air pollution.
authors: Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science and Engineering, Fudan University , Shanghai 200433, China.
authors: Pingping
authors: P
authors: Hu
authors: Zakariae
authors: Z
authors: Amghouz
authors: Zhiwei
authors: Z
authors: Huang
authors: Fei
authors: F
authors: Xu
authors: Yaxin
authors: Y
authors: Chen
authors: Xingfu
authors: X
authors: Tang
mesh_terms: D000393:Air Pollutants / Q000737:chemistry*; D000397:Air Pollution / Q000517:prevention & control; D016902:Air Pollution, Indoor / Q000517:prevention & control; D002384:Catalysis; D005557:Formaldehyde / Q000737:chemistry*; D017895:Manganese Compounds / Q000737:chemistry; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry; D012834:Silver / Q000737:chemistry*; D013499:Surface Properties; D056928:X-Ray Absorption Spectroscopy; D014961:X-Ray Diffraction
chemical_list: D000393:Air Pollutants; D017895:Manganese Compounds; D010087:Oxides; D005557:Formaldehyde; D012834:Silver; C027424:manganese oxide