Promoting effect of CeO2 in combustion synthesized Pt/CeO2 catalyst for CO oxidation

被引:282
作者
Bera, P
Gayen, A
Hegde, MS [1 ]
Lalla, NP
Spadaro, L
Frusteri, F
Arena, F
机构
[1] Indian Inst Sci, Solid State & Struct Chem Unit, Bangalore 560012, Karnataka, India
[2] Univ Campus, DAE Facilit, Inter Univ Consortium, Indore 452017, India
[3] Inst CNR TAE, I-98126 Messina, Italy
关键词
D O I
10.1021/jp022132f
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A 1% Pt/CeO2 catalyst prepared by the solution combustion method shows a higher catalytic activity for CO oxidation by O-2 compared to Pt metal particles. At least six hydrogen atoms are taken up per Pt at -25 degreesC. The structure of 1% Pt/CeO2 catalyst has been investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared (FTIR) spectroscopy. Rietveld refinement shows that Pt ions are incorporated into the CeO2 matrix in the form of Ce1-xPtxO2-delta solid solution. A decrease in oxygen content in 1% Pt/CeO2 is seen in relation to pure CeO2. TEM studies show that Pt is dispersed as atoms or ions and only a small amount as Pt metal particles. The Pt(4f) core level region in XPS shows that Pt is present mostly in the pt(2+) ionic state on CeO2 surface. FTIR of 1% Pt/CeO2 shows a strongly adsorbed CO peak at 2082 cm(-1) corresponding to oxidized Pt. These structural studies show that Pt ions in the catalyst are substituted for Cell ions in the form of Ce1-xPtxO2-delta, creating oxide ion vacancies leading to a strong pt(2+)-CeO2 interaction that is responsible for higher catalytic activity.
引用
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页码:6122 / 6130
页数:9
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