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本文报道了在本室建立的电化学现场红外反射光谱方法,运用于研究正丙醇在铂电极上氧化过程的结果。在Pt上正丙醇的电氧化是按双途径机理进行的,正丙醇在Pt上的解离吸附产物经红外反射光谱鉴定为CO和CH_3CH_3。在较低电位下,它们累积并稳定地吸附于电极表面使之毒化;在较高电位下,它们一经产生即氧化脱附,从而使正丙醇经反应中间体的氧化途径得以实现。在实验条件下,反应中间体经FTIR鉴定主要为CH_3CH_2COOH,氧化最终产物为CO_2。
This article reports the electrochemical field infrared reflectance spectroscopy established in our laboratory and is used to study the oxidation process of n-propanol on platinum electrode. The electrooxidation of n-propanol on Pt was carried out by a double-pass mechanism. The products of dissociation of n-propanol on Pt were identified as CO and CH_3CH_3 by infrared reflectance spectroscopy. At lower potentials, they accumulate and stably adsorb onto the surface of the electrode to cause poisoning. At higher potentials, they oxidize and desorb once they are generated, thereby enabling n-propanol to be oxidized by the reaction intermediates. Under the experimental conditions, the reaction intermediates identified by FTIR CH_3CH_2COOH, the final product of oxidation CO_2.