Mathematical Modeling of Electrochemical Promotion and of Metal−Support Interactions
Mathematical Modeling of Electrochemical Promotion and of Metal−Support Interactions
复制标题
电化学促进和金属-载体相互作用的数学模型
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
G. Pitselis
中科院分区：
文献类型：
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作者：
C. G. V. and;G. Pitselis
开发并求解了表面扩散-反应模型，以描述电化学促进（也称为催化活性的非法拉第电化学改性，NEMCA效应）对固体电解质载体上的多孔导电催化剂膜的影响。该模型解释了促进阴离子，Oδ-，物种从固体电解质到催化剂表面上的迁移（反向溢出）。相同类型的模型，然后应用到描述的情况下，精细分散的金属纳米粒子的ZrO 2和TiO 2的多孔载体，其中相同类型的Oδ- backspillover机制最近已被证明是有效的金属-载体相互作用的效果。得到两个基本的无量纲数，其指示电化学促进的催化剂的最大允许厚度，或分散的负载型金属催化剂中的最大微晶尺寸，以充分利用促进物质。
A surface diffusion−reaction model is developed and solved to describe the effect of electrochemical promotion (also known as non-Faradaic electrochemical modification of catalytic activity, NEMCA effect) on porous conductive catalyst films on solid electrolyte supports. The model accounts for the migration (backspillover) of promoting anionic, Oδ-, species from the solid electrolyte onto the catalyst surface. The same type of model is then applied to describe the effect of metal−support interactions for the case of finely dispersed metal nanoparticles on ZrO2- and TiO2-based porous supports where the same type of Oδ- backspillover mechanism has recently been shown to be operative. Two basic dimensionless numbers are obtained that dictate the maximum allowable thickness of electrochemically promoted catalysts, or the maximum crystallite size in dispersed supported metal catalysts, to fully utilize the promoting species.