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本文主要用电位阶跃法研究吸附铋原子对甲酸在铂电极上氧化过程的催化效应.吸附铋原子层的催化活性稍小于铅,但其反应机理则彼此相似,即当反应开始时受甲酸化学离解吸附步骤的速度控制,然后才逐渐转化为扩散控制,浓度越小,实现这一转化所需时间越短.在铂电极表面上,每一吸附铋原子占据3个铂原子,当覆盖度为0.75时,能使铂表面形成由两个铂原子构成的活性中心,从而表现出对甲酸氧化过程的最大活性.
In this paper, the potential effect of the adsorption of bismuth atoms on the oxidation of formic acid on Pt electrode was mainly studied by potentiometric step method.The adsorption activity of bismuth atomic layer was slightly less than that of lead, but the reaction mechanism was similar to each other, ie, The chemical control of the dissociative adsorption step is only controlled by the velocity of the chemical dissociative adsorption step, and then gradually converted to diffusion control. The smaller the concentration, the shorter the time required to achieve this conversion. On the surface of the platinum electrode, each adsorbed bismuth atom occupies three platinum atoms, When 0.75, the active site formed by two platinum atoms can be formed on the surface of the platinum, thereby exhibiting the maximum activity on the oxidation of formic acid.