期刊
CHEMICAL ENGINEERING JOURNAL
卷 109, 期 1-3, 页码 133-139出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2005.04.003
关键词
three-way catalysts; platinum; ceria-zirconia solid solutions; synthesis
Platinum was introduced into ceria-zirconia solid solutions to form nominal Ce0.66Zr0.32Pt0.02O2 solid solutions by sol-gel. It was found that, through sol-gel method, the Pt ions could be inserted into the ceria lattice according to the results of XRD, XPS and TPR analyses. This brought about a different synergistic effect between the Pt and Cc components in Ce0.66Zr0.32Pt0.02O2 compared with the Pt/Ce0.67Zr0.33O2 system prepared by traditional impregnation, such as increased the oxygen mobility in ceria-zirconia solid solutions and improved the stability of metallic state for platinum at high temperature. The lower surface Pt content leads to a worse three-way catalytic activity over the Pt-doped sample at low temperature. However, it features a better thermal stability after aging at 950 degrees C for 20 h, implying a self-generation mechanism of noble metals. This, in return, provides this material with a potential to be used in eliminating pollutants from auto exhaust. (c) 2005 Elsevier B.V. All rights reserved.
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