Abstract
The photochemical reaction between C3H6 and NO2 in air over ZnO was investigated in order to elucidate the chemical influences of atmospheric particles on photochemical smog formation. A photocatalytic action of ZnO was demonstrated from the findings: HCN formation, a remarkable increase in C3H6 consumption and CO2 formation rates, and larger values of activation energies for formation of CO2 and CH3CHO than those obtained without ZnO.