The Catalytic Oxidation of Carbon Monoxide on Titanium Dioxide; Anatase and Rutile

概要

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For the purpose of examining the surface state of titanium dioxide during the catalytic oxidation of carbon monoxide, the electric conductivities of anatase and rutile at 350–800°C, the amount of active oxygen on the catalyst surface at 400–600°C, and oxygen deficiency during the reaction were measured. The temperature-dependence of electric conductivities are represented by the formula σ=A·eE⁄RT in narrow temperature ranges. The amounts of active oxygen per unit surface area of rutile were 3–5 times as much as those of anatase at same temperatures, and 1–3% of them desorbed during the reaction. When the coverage fraction of active oxygen on the catalyst, θ, is assumed to be equal to 1 in oxygen, the following equation can express the relation between the rate constant of the reduction of titanium dioxide by carbon monoxide, kCO, and that of the oxidation of reduced titanium dioxide by oxygen kO2, during the oxidation of carbon monoxide: kCO·PCO·θ=2kO2·PO2·(1–θ)2.
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