Investigation of simultaneous adsorption of SO2 and NO on γ-alumina at low temperature using DRIFTS

► The adsorptions of SO2 and NO on Al2O3 were promoted by each other. ► The weakly absorbed species of NO and SO2 might be transformed into strongly absorbed species. ► The lattice oxygen of Al2O3 likely could directly participate in oxidation reactions. ► At least two types of intermediates [SO3NO] and [SO3NO2] formed when SO2 and NO interacted on Al2O3.