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. The heterogeneous reactions of SO2 in the presenceof NO2 and C3H6 on TiO2 were investigated with the aidof in situ diffuse reflectance infrared fourier transform spectroscopy (DRIFTS)under dark conditions or with UV–Vis irradiation. Sulfate formation with orwithout the coexistence of NO2 and/or C3H6 was analyzed withion chromatography (IC). Under dark conditions, SO2 reacting alone resulted in sulfiteformation on TiO2, while the presence of parts per billion (ppb) levels of NO2promoted the oxidation of SO2 to sulfate. The presence ofC3H6 had little effect on sulfate formation in the heterogeneousreaction of SO2 but suppressed sulfate formation in the heterogeneousreaction of SO2 and NO2. UV–Vis irradiation could significantlyenhance the heterogeneous oxidation of SO2 on TiO2, leading tocopious generation of sulfate, while the coexistence of NO2 and/orC3H6 significantly suppressed sulfate formation in experimentswith UV–Vis lights. Step-by-step exposure experiments indicated thatC3H6 mainly competes for reactive oxygen species (ROS), whileNO2 competes with SO2 for both surface active sites and ROS.Meanwhile, the coexistence of NO2 with C3H6 further resultedin less sulfate formation compared to introducing either one of themseparately to the SO2–TiO2 reaction system. The results of thisstudy highlighted the complex heterogeneous reaction processes that takeplace due to the ubiquitous interactions between organic and inorganicspecies and the need to consider the influence of coexisting volatile organic compounds (VOCs) and otherinorganic gases in the heterogeneous oxidation kinetics of SO2.

atmospheric chemistry and physics

Effects of NO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; and C&amp;lt;sub&amp;gt;3&amp;lt;/sub&amp;gt;H&amp;lt;sub&amp;gt;6&amp;lt;/sub&amp;gt; on the heterogeneous oxidation of SO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; on TiO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; in the presence or absence of UV–Vis irradiation