ABSTRACT
As shown earlier, it is the oxygen species 02, 02, and 0-generated on adsorption at the surface of an oxide catalyst which are responsible for electrophilic oxidation; both reactants of this reaction are located at the gas phase side of the gas-solid interface. Such catalytic reactions are called extrafacial, or reactions without transfer (WT) (Fig. 4.5a). On the other hand, the nucleophilic oxidation is a reaction between the adsorbed reactant and the oxide ion of the catalyst lattice, which is transferred across the gassolid interface. Therefore this type of catalytic reaction is called interfacial (Fig. 4.5b, I and II).
