Abstract
AbstractThe vapour phase air oxidation of 2‐methyl‐5‐ethylpyridine (MEP) has been investigated, and the various oxidation products identified. Using a doubly promoted vanadium catalyst, V2O5–TiO2–K2O, a 98% (mole) conversion of MEP was obtained with a yield of 36% for niacin and 18% for recirculatable products (i.e. products with an intact 3‐picoline skeleton) at a temperature of 413°C and a space velocity of 5500 h−1. In a comparison of the singly promoted catalysts, varying the atom ratio V/Ti, the catalyst with V/Ti = 100/25 was found to be most active. In a comparison of different preparation temperatures for the same catalyst, 1250°C was found to be most satisfactory. A reaction scheme is proposed with the corresponding rate constants and apparent activation energies.
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