Effects of NO<sub>2</sub> and C<sub>3</sub>H<sub>6</sub> on the heterogeneous oxidation of SO<sub>2</sub> on TiO<sub>2</sub> in the presence or absence of UV–Vis irradiation
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Published:2019-12-09
Issue:23
Volume:19
Page:14777-14790
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Chu BiwuORCID, Wang Yali, Yang Weiwei, Ma Jinzhu, Ma QingxinORCID, Zhang Peng, Liu YongchunORCID, He Hong
Abstract
Abstract. The heterogeneous reactions of SO2 in the presence
of NO2 and C3H6 on TiO2 were investigated with the aid
of in situ diffuse reflectance infrared fourier transform spectroscopy (DRIFTS)
under dark conditions or with UV–Vis irradiation. Sulfate formation with or
without the coexistence of NO2 and/or C3H6 was analyzed with
ion chromatography (IC). Under dark conditions, SO2 reacting alone resulted in sulfite
formation on TiO2, while the presence of parts per billion (ppb) levels of NO2
promoted the oxidation of SO2 to sulfate. The presence of
C3H6 had little effect on sulfate formation in the heterogeneous
reaction of SO2 but suppressed sulfate formation in the heterogeneous
reaction of SO2 and NO2. UV–Vis irradiation could significantly
enhance the heterogeneous oxidation of SO2 on TiO2, leading to
copious generation of sulfate, while the coexistence of NO2 and/or
C3H6 significantly suppressed sulfate formation in experiments
with UV–Vis lights. Step-by-step exposure experiments indicated that
C3H6 mainly competes for reactive oxygen species (ROS), while
NO2 competes with SO2 for both surface active sites and ROS.
Meanwhile, the coexistence of NO2 with C3H6 further resulted
in less sulfate formation compared to introducing either one of them
separately to the SO2–TiO2 reaction system. The results of this
study highlighted the complex heterogeneous reaction processes that take
place due to the ubiquitous interactions between organic and inorganic
species and the need to consider the influence of coexisting volatile organic compounds (VOCs) and other
inorganic gases in the heterogeneous oxidation kinetics of SO2.
Funder
National Natural Science Foundation of China
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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