The elimination of unburned methane produced by internal combustion engines is extremely important because of the strong greenhouse effect of methane. Difficulties in controlling unburned methane arise from its characteristics, such as its difficulty of adsorption, low exhaust gas temperatures in an efficient engine, low concentrations of unburned emitted methane, and the coexistence of steam and residual oxygen as coexisting substances in the exit gas. Results of the present study demonstrate that the removal activity of methane by complete combustion was improved dramatically at low temperatures by the application of a DC electric field to the Pd/Ce_xZr_1−xO₂ catalyst system, even under a humid atmosphere. Specifically, 1 wt% Pd/Ce_0.25Zr_0.75O₂ showed very higher methane conversion under humid conditions than under dry conditions at 473 K in the presence of an electric field. To elucidate the reaction mechanisms involved in this process of steam adsorption, we conducted partial pressure dependence tests and activity tests with steam under an electric field.

中文翻译：

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Pd/CZO催化剂和电场对贫湿甲烷低温完全燃烧的协同效应


由于甲烷具有很强的温室效应，消除内燃机产生的未燃烧甲烷极为重要。未燃烧甲烷的控制困难源于其难以吸附、高效发动机中废气温度低、未燃烧排放甲烷浓度低、以及出口气体中蒸汽和残余氧作为共存物质共存等特点。本研究的结果表明，通过将直流电场应用于Pd/Ce _x Zr _{1− x} O ₂催化剂体系，即使在潮湿的气氛下，在低温下通过完全燃烧去除甲烷的活性也得到显着提高。具体地，在电场存在下，在473K下，1wt%Pd/Ce _0.25 Zr _0.75 O ₂在潮湿条件下表现出比在干燥条件下高得多的甲烷转化率。为了阐明蒸汽吸附过程中涉及的反应机制，我们在电场下进行了分压依赖性测试和蒸汽活性测试。