甲醇催化燃烧动力学及铂催化剂结构选择性研究

Subjects: Dynamic and Electric Engineering >> Engineering Thermophysics submitted time 2018-02-01 Cooperative journals: 《工程热物理学报》

涂维峰1,2，冉景煜1,3，张力1,3

Abstract： Intrinsic kinetic of methanol catalytic combustion was investigated under kinetically control regime. The rates of methanol catalytic combustion are determined by oxygen activation on supported platinum catalyst and limited by the number of surface reactive oxygen atoms on platinum cluster surface. The rate of methanol catalytic combustion which equals to the rate of oxygen dissociation on Pt cluster increases with increasing partial pressure of oxygen and is independent of partial pressure of methanol. The rate constant of methanol catalytic combustion increases as the coordination number of surface platinum atom and the diameter of platinum cluster, because a small amount of inert species preferentially bind to coordinatively unsaturated surface platinum atoms, which prevents these atoms to involve catalytically activation of oxygen. Methanol catalytic combustion can occur efficiently over a trace amount of supported platinum catalyst at low temperatures, showing a potential advantage in improving the combustion characteristic in a micro scale combustor.

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