相对湿度对SO2/NH3在α-Fe2O3表面非均相反应的影响

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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.

Key words： heterogeneous reaction relative humidity NH₃ α-Fe₂O₃ particles sulfates diffuse reflectance infrared Fourier transform spectroscopy

Received: 05 February 2023

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X513

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	WANG Shuang-xi
	HE Xiang
	WU Jian-jun

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WANG Shuang-xi,HE Xiang,WU Jian-jun. Effect of relative humidities on heterogeneous reaction of SO₂/NH₃ on the surface of α-Fe₂O₃[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(9): 4542-4549.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I9/4542

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