论文部分内容阅读
应用电化学循环伏安和原位FTIR反射光谱研究1,2-丙二醇在Pt电极上吸附和氧化过程。结果指出1,2-丙二醇的电氧化可按双途径进行。其一经1,2-丙二醇在Pt上解离吸附产物氧化至CO_2。但在较低电位下这些解离吸附产物(红外检测为CO_(ad)、?C=CH_2]_(ad)等)累积吸附于电极上,毒化Pt表面抑制其它反应。当电位大于0.3V后它们一经生成即氧化脱附,从而使1,2-丙二醇得以在未毒化Pt表面经反应中间体氧化至CO_2。在实验条件下,原位FTIR反射光谱检测到的反应中间体可能有HOC-CHOHCH_3(或CH_2OHCOCH_3)和HOOC-COCH_3(或HOOC-CHOHCH_3)等物种。
Cyclic voltammetry and in situ FTIR reflectance spectroscopy were used to study the adsorption and oxidation of 1,2-propanediol on Pt electrode. The results indicate that the electrooxidation of 1,2-propanediol can proceed in a dual route. It is oxidized to CO_2 by the dissociative adsorption product of 1,2-propanediol on Pt. However, these dissociative adsorption products (CO_ (ad),? C_CH_2] _ (ad), etc.) accumulated on the electrode at a lower potential and poisoned the Pt surface to inhibit other reactions. When the potential is greater than 0.3V, they oxidize and desorb once they are generated, so that 1,2-propanediol can be oxidized to CO_2 on the un-poisonized Pt surface through the reaction intermediate. Under the experimental conditions, the in-situ FTIR reflectance spectroscopy detected the reaction intermediates may have HOC-CHOHCH 3 (or CH 2 OHCOCH 3) and HOOC-COCH 3 (or HOOC CHOHCH 3) and other species.