Catalytic Combustion of Methane over Pt–Ce Oxides under Scarce Oxygen Condition

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• 作者：Jianhui Jin ; Chuang Li ; Chi-Wing Tsang ; Bin Xu ; Changhai Liang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：March 2, 2016
• 年：2016
• 卷：55
• 期：8
• 页码：2293-2301
• 全文大小：506K
• ISSN：1520-5045

文摘

Nanocrystalline Pt–Ce oxides were prepared by citric acid method and impregnation method, and then mounted on cordierites to investigate the catalytic behavior for methane oxidation under scarce oxygen environment. XRD, H₂-TPR, TEM, and XPS were employed to investigate the relationship between physicochemical characteristics and catalytic performances. Pt–CeO₂ showed good activity for oxygen conversion in fuel rich condition, especially during extinction step, with a huge hysteresis loop. By varying the oxygen concentration, Pt–CeO₂ catalysts were poisoned by oxygen along ignition, and the competitive adsorption of oxygen and methane inhibits the activation of methane. Owing to the interaction between Pt and CeO₂, and a more homogeneous dispersion of Pt in CeO₂ compared with that of Pt/CeO₂ prepared by impregnation, Pt–CeO₂ catalysts maintained high activity during calcination and pretreatments.