Abstract
Oxidation and chemisorption rates were measured for several powdered porous carbons with surface areas of 500–2400 m 2/g. A thermal balance was used. Activation energies of adsorption and intrinsic adsorption rate constants were obtained from initial adsorption rate data at 300–400°C. The data fitted a second-order Langmuir adsorption isotherm, suggesting that oxygen molecules dissociated on the surface. The data for the oxidation runs indicated a clear transition from a high activation energy regime (at low to moderate temperature) to an adsorption control regime. The activation energy and oxidation rate at high temperature (above 625°C) agreed with an extrapolation of the adsorption data. The reactivity of the carbons correlated with the active surface area from the chemisorption data but not with the total surface area measured by low temperature adsorption of nitrogen.
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