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首页> 外文期刊>The Canadian Journal of Chemical Engineering >Methane oxidation over Pt, Pt:Pd, and Pd based catalysts: Effects of pre-treatment
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Methane oxidation over Pt, Pt:Pd, and Pd based catalysts: Effects of pre-treatment

机译：Pt，Pt：Pd和Pd基催化剂上的甲烷氧化：预处理的效果

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This paper presents a comparison of the activity for methane oxidation of selected commercial platinum, palladium, and platinum-palladium supported catalysts. Precious metal loadings are typical of those found in the catalytic converters for lean-burn natural gas engines. Experiments are presented for de-greened as well as hydrothermally aged catalysts, both in the presence and the absence of water. For the platinum catalyst, fraction conversion of methane is shown to be independent of methane concentration, while for the palladium-containing catalysts a dependence of conversion on methane partial pressure is observed. For catalysts containing palladium, reduction in hydrogen gives an increase in methane conversion activity, although the increase is subsequently lost in the oxidizing atmosphere. Hydrothermal aging of the platinum catalyst causes a relatively large and permanent loss in methane oxidation activity, while the palladium-based catalysts showed more resistance to deactivation. Adding a small amount of palladium to the platinum catalyst provides an overall improvement in performance.
机译：本文对选定的商用铂，钯和铂-钯负载催化剂的甲烷氧化活性进行了比较。在稀薄燃烧天然气发动机的催化转化器中，贵金属负载是典型的负载。提出了在有水​​和无水条件下进行脱绿以及水热老化催化剂的实验。对于铂催化剂，甲烷的馏分转化率显示出与甲烷浓度无关，而对于含钯催化剂，观察到转化率对甲烷分压的依赖性。对于含钯的催化剂，氢的还原增加了甲烷的转化活性，尽管这种增加随后在氧化气氛中损失了。铂催化剂的水热老化会导致甲烷氧化活性的相对较大且永久的损失，而钯基催化剂则表现出更大的抗失活性。将少量钯添加到铂催化剂中可提供总体性能改善。

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