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首页> 外文会议>International Symposium on Energy and Electrochemical Processes for a Cleaner Environment, 2001, San Francisco, CA >ELECTROCHEMICAL PROMOTION OF THE NO_x REDUCTION OVER Pt, Pd AND Rh CATALYSTS
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ELECTROCHEMICAL PROMOTION OF THE NO_x REDUCTION OVER Pt, Pd AND Rh CATALYSTS

机译：Pt，Pd和Rh催化剂上NO_x还原的电化学促进

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摘要

Solid electrolytes can be used as active catalyst supports to promote the performance of conducting metal or metal oxide catalysts deposited on them via electrical potential or current application between the catalyst and a counter electrode. This phenomenon is known as Electrochemical Promotion or Non-Faradaic Electrochemical Modification of Catalytic Activity (NEMCA effect). More than sixty catalytic reactions have been studied so far using a variety of catalysts and solid electrolytes and it has been found that Electrochemical Promotion is a general phenomenon not limited to any particular group of catalytic reactions, conductive catalysts or solid electrolytes. In this communication we summarize and discuss Electrochemical Promotion studies of NO_x reduction catalyzed by Rh, Pt and Pd deposited on O~(2-) and Na~+ conducting solid electrolytes. The reduction of NOx under stoichiometric or lean-burn conditions is extremely important in the treatment of the exhaust gases of internal combustion engines operating under stoichiometric or lean-burn conditions. It was found that both O~(2-) and Na~+ conducting solid electrolytes can induce dramatic and, in most cases, reversible cases in the catalytic activity and selectivity of Rh, Pt and Pd for the reduction of NO. The rate of NO reduction can be typically enhanced by a factor of 10 but in the case of NO reduction by C_3H_6 in presence of O_2 more than hundred-fold enhancement in catalytic rate is observed. The observed pronounced promotional phenomena are discussed in terms of the recently established rules of electrochemical and classical promotion.
机译：固体电解质可以用作活性催化剂载体，以通过在催化剂和对电极之间施加电势或电流来提高沉积在其上的导电金属或金属氧化物催化剂的性能。这种现象被称为催化活性的电化学促进或非法拉第电化学修饰（NEMCA效应）。迄今为止，已经使用多种催化剂和固体电解质对六十多种催化反应进行了研究，并且发现电化学促进是一种普遍现象，不限于任何特定种类的催化反应，导电催化剂或固体电解质。在本交流中，我们总结并讨论了由电化学沉积在O〜（2-）和Na〜+导电固体电解质上的Rh，Pt和Pd催化的NO_x还原的电化学促进研究。在化学计量或稀薄燃烧条件下的NO x的还原在处理在化学计量或稀薄燃烧条件下操作的内燃机的废气中非常重要。发现O〜（2-）和Na〜+导电固体电解质都可以在Rh，Pt和Pd还原NO的催化活性和选择性方面引发剧烈的反应，并且在大多数情况下是可逆的。 NO还原速率通常可以提高10倍，但在O_2存在下用C_3H_6还原NO的情况下，催化速率提高了数百倍。根据最近建立的电化学和经典促进规则讨论了观察到的明显促进现象。

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