Platinum Precursors Effects on Pt/（Ce-Zr-La-Pr）O Catalysts
来源期刊：Journal of Rare Earths2006年第S2期
论文作者：张爱敏 宁平
文章页码：107 - 109
摘 要：(Ce-Zr-La-Pr)O acted as substrates and Pt acted as catalytic active component, the influences of the precursors, H2PtCl6, Pt（NH3）2（NO2）2 and Pt（OH）2（C2H5ONH2）2, and their solutions acidities on the catalytic performances and active metal distribution degrees of the catalysts were studied by TPR and CO pulse titration technologies. The results show that: （1） Pt precursors and their solutions pH values influenced the catalytic activities obviously, the oxygen storage capabilities （for short OSCs） and the active metal distribution degrees of Pt/（Ce-Zr-La-Pr）O; （2） The catalysts prepared by the precursors of H2PtCl6, Pt（NH3）2（NO2）2 and Pt（OH）2（C2H5ONH2）2 respectively, had the highest catalytic activities and OSCs at different pH values; （3） The active metal distribution degrees of the catalysts which prepared by H2PtCl6 and Pt（OH）2（C2H5ONH2）2 increased with pH, but that of the catalyst prepared by Pt（NH3）2（NO2）2 appeared "V" shape. It indicates that the active metals precursors and their solutions acidities had direct influences on the mutual functions of the active metals and the substrates, and different precursors may had an optimal pH value to ensure the prepared catalysts have the supreme catalytic activities, OSC and active metal distribution degrees.
张爱敏，宁平
摘 要：(Ce-Zr-La-Pr)O acted as substrates and Pt acted as catalytic active component, the influences of the precursors, H2PtCl6, Pt（NH3）2（NO2）2 and Pt（OH）2（C2H5ONH2）2, and their solutions acidities on the catalytic performances and active metal distribution degrees of the catalysts were studied by TPR and CO pulse titration technologies. The results show that: （1） Pt precursors and their solutions pH values influenced the catalytic activities obviously, the oxygen storage capabilities （for short OSCs） and the active metal distribution degrees of Pt/（Ce-Zr-La-Pr）O; （2） The catalysts prepared by the precursors of H2PtCl6, Pt（NH3）2（NO2）2 and Pt（OH）2（C2H5ONH2）2 respectively, had the highest catalytic activities and OSCs at different pH values; （3） The active metal distribution degrees of the catalysts which prepared by H2PtCl6 and Pt（OH）2（C2H5ONH2）2 increased with pH, but that of the catalyst prepared by Pt（NH3）2（NO2）2 appeared "V" shape. It indicates that the active metals precursors and their solutions acidities had direct influences on the mutual functions of the active metals and the substrates, and different precursors may had an optimal pH value to ensure the prepared catalysts have the supreme catalytic activities, OSC and active metal distribution degrees.
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