Citation: ZHANG Zhi-min, ZHANG Cheng-xiang, AN Kang, LIU Qiang, ZHANG Si-ran, LIU Yuan. Preparation of La-Ce oxide-modified platinum-cobalt nano-bimetallic catalysts with perovskite-type composite oxides as precursors and their performance in CO oxidation[J]. Journal of Fuel Chemistry and Technology, ;2019, 47(11): 1357-1367. shu

Preparation of La-Ce oxide-modified platinum-cobalt nano-bimetallic catalysts with perovskite-type composite oxides as precursors and their performance in CO oxidation

ZHANG Zhi-min ¹ ,
ZHANG Cheng-xiang ^2,3 ,
AN Kang ^2,3 ,
LIU Qiang ^2,3 ,
ZHANG Si-ran ^2,3,, ,
LIU Yuan ^2,3,,

1.
School of Chemistry and Chemical Engineering, Anhui University of Technology, Maanshan 243002, China
2.
Tianjin Key Laboratory of Applied Catalysis Science and Technology, School of Chemical Engineering, Tianjin University, Tianjin 300072, China
3.
Collaborative Innovation Center of Chemical Science and Engineering(Tianjin), Tianjin 300072, China

Corresponding author: ZHANG Si-ran, siran@tju.edu.cn LIU Yuan, yuanliu@tju.edu.cn
Received Date: 11 July 2019
Revised Date: 17 September 2019

Fund Project: the Natural Science Foundation of China 21576192The projecct was supported by the Natural Science Foundation of China (21872101, 21576192), Science and Technology Program of Tianjin, China (18ZXSZSF00070)the Natural Science Foundation of China 21872101Science and Technology Program of Tianjin, China 18ZXSZSF00070

Figures(9)

A new scheme for constructing composite catalyst composed of oxide-modified bimetallic nanoparticles was proposed, where perovskite-type oxide (PTO) is utilized to confine multifold metal ions in the perovskite crystal lattice. With a perovskite-type oxide (PTO) of La_1-yCe_yCo_0.87Pt_0.13O₃ loaded on large surface area SiO₂ as the precursor, where the La, Ce, Co and Pt ions were uniformly mixed and confined in the PTO crystallites, a series of Pt-Co/La-Ce-O/SiO₂ catalysts were prepared through reduction. The Pt-Co/La-Ce-O/SiO₂ catalysts were characterized by nitrogen physisorption, XRD, H₂-TPR and TEM; their catalytic performance in CO oxidation was investigated. The results indicate that La-Ce-O-Pt-Co clusters are constructed on the SiO₂ surface, forming platinum-cobalt nano-bimetallic particles after reduction; the modification of Pt with Co can enhance the catalytic activity and the addition of Ce can further improve the catalytic performance in CO oxidation. The La_0.8Ce_0.2Co_0.87Pt_0.13O₃/SiO₂ catalyst with y=0.2 (representing the Ce content) exhibits high activity in CO oxidation; over it, a complete conversion of CO can be achieved at 120℃. The La_0.8Ce_0.2Co_0.87Pt_0.13O₃/SiO₂ catalyst performs well for CO oxidation even in the presence of 15% (volume ratio) H₂O and 12.5% (volume ratio) CO₂. Moreover, the oxide-modified platinum-cobalt nano-bimetallic catalysts display excellent stability with high resistance against sintering.
- nano-bimetal catalyst,
- perovskite-type oxide,
- CO oxidation,
- oxide promoter,
- rare earth metal
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