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A new alternative process for the direct gas phase hydroxylation of aromatics is studied using molecular oxygen (air) or nitrous oxide in the presence of copper containing calcium–phosphate. The activity of Cu–Ca–phosphate catalyst in the reaction of benzene with oxygen, N 2 O or the mixture of oxygen–ammonia as oxidants is compared. Beside benzene also alkyl aromatics were used in the same...
The gas phase hydroxylation of aromatics is studied over Cu-modified phosphate catalysts. Benzene is converted to phenol in the presence of oxygen and ammonia at 450 o C. The same catalysts are active for benzene hydroxylation using nitrous oxide as the oxidant. Catalysts with different copper loading are tested and the effect of the structure of copper species on the yield of phenol is compared...
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