MECHANISM OF CATALYTIC ACTION OF OXIDE SYSTEMS IN REACTIONS OF ALDEHYDE OXIDATION TO CARBOXYLIC-ACIDS

The mechanism of selective aldehyde oxidation to carboxylic acids cata lyzed by oxide catalysts is discussed by the example of acrolein oxida tion to acrylic acid. The multistep mechanism is determined, which inv olves consecutive transformation of the coordinatively bound aldehyde into carbonyl-bound aldehyde and symmetrical carboxylate with particip ation of lattice oxygen. Analysis of the structure, energetic characte ristics, and acid-base properties of intermediate species, initial ald ehyde, and reaction products formed the basis for the principles of de signing the active surface. These principles rake into account the aci dity of the site responsible for the stabilization of a specific inter mediate species and the energy of an oxygen-surface bond.