US EPA

5931146 

Journal Article 

Incorporating Mn cation as anchor to atomically disperse Pt on TiO2 for low-temperature removal of formaldehyde 

Chen, J; Jiang, MZ; Xu, WJ; Chen, J; Hong, ZX; Jia, HP 

2019 

Yes 

Applied Catalysis B: Environmental
ISSN: 0926-3373 

259 

118013 

English 

10.1016/j.apcatb.2019.118013 

WOS:000488308800001 

https://www.scopus.com/inward/record.uri?eid=2-s2.0-85073702278&doi=10.1016%2fj.apcatb.2019.118013&partnerID=40&md5=3fad72ba2c2ea3ad48034837b2253e1a
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The redox-driven hydrolysis precipitation is developed to atomically disperse Pt on TiO2 by involving high-valence Mn cations as the "anchor" into TiO2. With multiple characterizations including Cs-HAADF-STEM and XAFS, single-atom state of Pt on the surface of support is evidenced. Due to high dispersion of Pt and strong interaction between Pt and MnOx-TiO2 (Mn-TiO2), the physicochemical properties of catalysts are obviously improved. With combination of theoretical calculation and characterization, it is revealed that metallic Pt atom is stabilized by lattice oxygen of support. As observed, only 0.5% nominal amount of Pt loading (actual amount = 0.47%) on Mn-TiO2 support can meet the demands of complete removal of HCHO with high/low concentrations and severe space velocity at low temperature. Through analysis of in-situ DRIFTS of HCHO, the catalytic oxidation of HCHO over Pt/Mn-TiO2 obeys Mars-van-Krevelen mechanism. By associating with H-D exchange, it is found that introduction of water vapor can inhibit side-reactions and facilitate deep oxidation of HCHO. 

Redox-driven hydrolysis; Platinum; Mn-TiO2; Single atom; Catalytic oxidation