【摘 要】
：
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 cat
【机 构】
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aState Key Lab of New Ceramic and Fine Processing,The Administrative Centre for China's Agenda 21
【基金项目】
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National Natural Science Foundation of China for the financial support of Project
论文部分内容阅读
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 H2 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.
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