Effect of relative humidities on heterogeneous reaction of SO2/NH3 on the surface of α-Fe2O3
WANG Shuang-xi, HE Xiang, WU Jian-jun
College of Ecology and Environment, Key Laboratory of Oasis Ecology, Ministry of Education, Xinjiang Jinghe Observation and Research Station of Temperate Desert Ecosystem, Ministry of Education, Xinjiang University, Urumqi 830017, China
Abstract：Heterogeneous reactions of SO2/NH3 on the surface of α-Fe2O3 particles were investigated by in situ diffuse reflection Fourier transform spectroscopy. The effect of relative humidities (RHs) on the formation of sulfate particles under the action of NH3 were studied. The results show that sulfate (1271, 1244, 1163, 1069cm-1) and ammonium salt (1698, 1435cm-1) were formed on the surface of particulate matter under dry conditions. NH3 can cooperate with SO2 to promote the formation of sulfate particles. Sulfate peak (1244cm-1) was redshifted to bisulfate (1239cm-1), which implies the formation of bisulfate under wet conditions. As RH increased from 0% to 78%, the formation rate of sulfate decreased from 9.38×10-17 ions/(g×s) to 4.33×10-17 ions/(g×s) on particle surface. Moreover, the uptake coefficient (γ) of SO2 decreased from 2.04×10-6 to 9.43×10-7. These indicated that the water vapors inhibited heterogenous reaction of SO2/NH3 with α-Fe2O3 particles.
王双喜, 何翔, 吴建军. 相对湿度对SO2/NH3在α-Fe2O3表面非均相反应的影响[J]. 中国环境科学, 2023, 43(9): 4542-4549.
WANG Shuang-xi, HE Xiang, WU Jian-jun. Effect of relative humidities on heterogeneous reaction of SO2/NH3 on the surface of α-Fe2O3. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(9): 4542-4549.
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