The effect of ceria content on the performance of Pt/CeOb>2b>/Alb>2b>Ob>3b> catalysts in the partial oxidation of methane

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• 作者：A.C.S.F. Santos ; S. Damyanova ; G.N.R. Teixeira ; L.V. Mattos ; F.B. Noronha ; F.B. Passos and J.M.C. Bueno
• 刊名：Applied Catalysis A ; General
• 出版年：2005
• 期刊代码：4_0926860x
• 类别：ch
• 出版时间：2005
• 卷：290
• 期：1-2
• 页码：123-132
• 文件大小：351 K

摘要

The effect of CeOb>2b> loading (1–20 wt.%) on the properties and catalytic behaviors of CeOb>2b>–Alb>2b>Ob>3b>-supported Pt catalysts on the partial oxidation of methane was studied. The catalysts were characterized by Sb>BETb>, X-ray diffraction (XRD), temperature-programmed reduction (TPR) and oxygen storage capacity (OSC). XRD and TPR results showed that the pretreatment temperature of the support influences on the amount of CeOb>2b> with fluorite structure. The pretreatment temperature of the support and CeOb>2b> loading influenced the morphology of Pt. OSC analysis showed a significant increase in the oxygen storage capacity per weight of CeOb>2b> for samples with high CeOb>2b> loading (12 and 20 wt.%). TPR analyses showed that the addition of Pt promotes the reduction of CeOb>2b>. This effect was more significant for the catalysts with high CeOb>2b> loading (≥12 wt.%). The dispersion of Pt, measured by the rate of cyclohexane dehydrogenation, increases with increasing of the pretreatment temperature of the support. It was shown that the kind of the support is very important for obtaining of catalysts resistant to carbon formation. The catalysts with high CeOb>2b> loading (≥12 wt.%) showed the highest catalytic activity and stability in the reaction of partial oxidation of methane due to a higher Pt–CeOb>2b> interface.