Abstract
The surface reaction rates of SO 2 and SO 2 NO 2 mixtures with a freshly generated carbon soot aerosol have been measured at room temperature and gas concentrations of a few ppm using radiotracer techniques. The soot had a surface area of 24 m 2 g −1 and the limiting surface SO 3 formation was 3–4 mg g −1. The initial rate of reaction increased with SO 2 concentration up to about 150 μg SO 3 g −1 min −1 at 7.3 ppm, the exact value depending on the method of data analysis. The addition of NO 2 accelerated SO 3 formation via SO 2 + NO 2 → SO 3 + NO. However at high NO 2 concentrations the final amount of SO 3 is depressed. This is interpreted as active site poisoning by surface NO 3 formation. A Langmuir-Hinshelwood model incorporating these reactions is developed and shows good agreement with the experimental results. The new data show the importance of including NO 2 surface reactions in considerations of gas-aerosol interactions in the atmosphere and in plumes.
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