期刊
PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL
卷 22, 期 1, 页码 7-14出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.pnsc.2011.12.002
关键词
CeO2-ZrO2 mixed oxides; Strontium; Platinum; Micro-structure; OSC
资金
- National Natural Science Foundation of China [50972069]
Strontium was introduced into CeO2-ZrO2 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 Sr2+ 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 Sr2+ 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. (C) 2012. Chinese Materials Research Society. Production and hosting by Elsevier B.V. All rights reserved.
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