Impact of flow velocity on the heterogeneous reaction of SO2 over Fe2O3

Flow velocity, potentially linked to dry deposition velocity and wind speed parameters, show non-marginal significance in the heterogeneous oxidation of SO 2 on α-Fe 2 O 3 particles. Our uptake measurement results produce lab-based evidence that an increase in flow velocity can potentially strengthen SO 2 uptake capability over α-Fe 2 O 3 by nearly one order of magnitude within the range of considered reaction conditions. Additionally, specimen analysis of surface S-containing products indicates a distinct SO 2 oxidation regime, shifting from the heterogeneous reaction mediated by active sites under low flow velocity and low RH to an aqueous-like multiphase-dominated pathway under high flow velocity and high RH. An attempt was further made to link this experimental parameter to dry deposition velocity regulated by wind force in the atmosphere. This work highlights the significance of flow velocity in triggering fast sulfate production concerning dust chemistry.