Abstract
The surface properties of CoMg/Al2O3 were evaluated in the aerobic oxidation of p-cresol. The surface interaction is enhanced greatly after Co and Mg impregnation with the mole ratio of Co/Mg from 2 : 1 and 2 : 3. The strongest interaction for the nonpolarity and benzene ring was found on CoMg/Al2O3 with Co/Mg of 2 : 3. But for the interaction with p-π group bonding with negative anion, the highest value appears on the catalyst with the Co/Mg of 2 : 2. In aerobic oxidation of p-cresol, the conversion is significantly increased with Co addition and reaches around 60 % after 24 h' reaction at 338 K. The highest selectivity of p-hydroxybenzaldehyde of 99 % is achieved on Al2O3 with the co-impregnation mole ratio of Co/Mg of 2 : 2. It is suggested that medium adsorption of the reactants and strong stabilization of the intermediates facilitate the aerobic oxidation of p-cresol to p-hydroxybenzaldehyde.
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