Abstract
The chemical removal rate of SO2 in the presence of artificial aerosol particles is investigated. The aerosol is continuously mixed with SO2 and dry or humid air in a dynamic flow reactor. The particles contain one of the following substances, respectively, which catalyze the oxidation of adsorbed or absorbed SO2 molecules: MnCl2, MnSO4, Mn(NO3)2, CuCl2, CuSO4, Cu(NO3)2. The removal of SO2 from the gas phase due to sorption and reaction with the airborne particles is investigated as a function of (a) the number density of the particles, and (b) the relative humidity. All experiments show a pseudo‐first‐order dependence of the SO2 removal rate with regard to the SO2 gas phase concentration. A non‐linear relationship between the removal rate and the particle number density is observed except for MnSO4 and Cu(NO3)2 aerosol. It is shown up to 94% r.h. that the removal rate increases specifically for each type of aerosol with the relative humidity. Among all salts investigated MnCl2 is found to have the highest efficiency in the chemical removal of SO2 at atmospheric background conditions. For 94% r.h., pseudo‐first‐order rate constants of up to 6% h‐1 are calculated.
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