Microstructure and oxygen storage capacity of Sr-modified Pt/CeO 2-ZrO 2 catalysts

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  • Rui Ran
  • Jun Fan
  • Duan Weng


Original languageEnglish
Pages (from-to)7-14
Journal / PublicationProgress in Natural Science: Materials International
Issue number1
Publication statusPublished - Feb 2012
Externally publishedYes



Strontium was introduced into CeO 2-ZrO 2 mixed oxides (CZ) by doping and impregnation methods, and then Pt was impregnated on the Sr-modified CZ to obtain the catalysts. X-ray diffraction (XRD), X-photon spectra (XPS), high-resolution transmission electronic microscopy (HRTEM) and H 2 temperature programmed reduction (TPR) were carried out to characterize the micro-structure and reducibility of catalysts. The oxygen storage capacity (OSC) was evaluated with CO serving as probe gas. The results showed that the incorporation of Sr 2+ in the lattice of CZ could promote the OSC properties by increasing the structure defects and enhancing the diffusion rate of oxygen from bulk to surface. For the Sr-impregnated sample, the strong metal-support interaction (SMSI) between Pt and CZ was interrupted, since Sr covered partial surface Ce species. Such interruption retarded the back-spillover effect occurring at the Pt/Ce interface at low temperature, resulting in the loss of OSC. Meanwhile, it was found that a part of impregnated Sr 2+ could partially diffuse from the surface to the inner atomic layers of CZ and partially incorporated in the lattice during the calcination. The OSC performance of Sr-impregnated sample therefore climbed remarkably with the rise of temperature. © 2012. Chinese Materials Research Society.

Research Area(s)

  • CeO 2-ZrO 2 mixed oxides, Micro-structure, OSC, Platinum, Strontium

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