白金電極上での2-アルコキシエタノールの陽極反応
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概要
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The anodic oxidation of 2-alkoxyethanol on a platinum electrode in 0.5M sulfuric acid has been studied on the basis of product-analysis and polarization behavior. The results obtained are as follows. (1) The significant oxidation of 2-alkoxyethanol used takes place at potential below 0.8V(vs. SCE) from the polarization curve. The electrolysis of methoxye-thanol(or ethoxyethanol) at this potential region yields methanol(or ethanol) and formaldehyde at the ratio of 1/2. It is considered from the above results and the coulonmetry of products that the initial oxidation proceeds by the discharge through alcoholic oxygen and two-electrons transfer is involved in the overall reaction. (2) In the case of propoxy and isopropoxyethanol, the reaction by the discharge through ethereal oxygen is observed to occur, except for the similar reaction to that of methoxyethanol. (3) The reaults obtained from polarization characteristics, Tafel slope, reaction order, and the reaction of adsorbed oxygen species on the electrode could be explained on the basis of the following mechanisms. H_2O -> + H^+ + e, RH -> + H^+ + e, R^ + OH^ ->__ R' + H_2O (RH:alkoxyethanol, R':products). Two Temkin-type adsorption equilibriums occur prior to the rate determining step, which is the chemical reaction on electrode surface between the two adsobates to yield products. On the other hand, the experimentally observed resu]ts support that the electrode reaction of propoxy and isopropoxyethanol proceeds according to the followving mechanisms. H_2O -> + H^+ + e, RH ->, RH_ + OH_ ->_ R_ + H_2O, R_ + H_2O -> R' + e. Similarly, the two equilibriums are Temkin-type adsorption and the chemical reaction on electrode surface is the rate determining step.
- 山形大学の論文
- 1980-01-21
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- 白金電極上での2-アルコキシエタノールの陽極反応