Desorption of catalytic oxidation products of o-xylene from the surface of carbon catalysts
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In a study of the oxidation of o-xylene on carbons (in the range of 523–573°K) under nonstationary conditions, it was found that considerable amounts of the reaction products (phthalic anhydride and CO2) are adsorbed on the surface of the catalysts (phthalic anhydride more strongly than CO2). The adsorption of the products is chemical in nature, like the adsorption of initial o-xylene. The bond between the adsorbates and the surface weakens with increase in the number of acidic groups on the surface. Since the active carbons are characterized by a higher basicity than the oxidized ones, in the first case the oxidation products of o-xylene are adsorbed more strongly and desorbed more slowly.
KeywordsOxidation Active Carbon Anhydride Oxidation Product Acidic Group
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