气候变化领域集成服务门户(CCPortal): NH3-promoted heterogeneous reaction of SO2 to sulfate on α-Fe2O3 particles with coexistence of NO2 under different relative humidities

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DOI	10.1016/j.atmosenv.2021.118622
	NH3-promoted heterogeneous reaction of SO2 to sulfate on α-Fe2O3 particles with coexistence of NO2 under different relative humidities
	He X.; Wu J.-J.; Ma Z.-C.; Xi X.; Zhang Y.-H.
发表日期	2021
ISSN	1352-2310
卷号	262
英文摘要	Heterogeneous reactions play an essential role in the research area of formation processes of secondary aerosols. In this study, heterogeneous reactions of NH3/SO2/NO2 with α-Fe2O3 particles at different relative humidities (RHs) were investigated by using a gas-flow system combined with diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The results show that the presence of NH3 leads to the rapid conversion of SO2 to sulfate as a result of the proton transfer function and neutralization on the α-Fe2O3 particles in dry condition. NH3 can also promote the hydrolysis of NO2 dimers to HONO formation and result in the formation of more sulfate on the particle surface in humid conditions. On the other hand, water vapor plays both positive and negative roles in the uptake of SO2 during the reaction processes. When the RH increases from 0% to 62%, the formation rate of sulfate and uptake coefficient for SO2 in the initial stage increase about 3-fold. However, due to the inhibition effect of water layer between trace gases and active surface, the above values of reaction kinetic decrease about 21% when the RH increases from 62% to 72%. Our results may provide insight into the effects of NH3 and RH for the converting SO2 into sulfate on α-Fe2O3 particles, which supply basic data for the formation of secondary particles in field studies of atmospheric environment. © 2021 Elsevier Ltd
关键词	Diffuse reflectance infrared fourier transform spectroscopy Heterogeneous reaction NH3 Relative humidity Sulfate formation process
语种	英语
scopus关键词	Ammonia; Atmospheric humidity; Flow of gases; Hematite; Nitrogen oxides; Reaction kinetics; Reflection; Sulfur compounds; Surface reactions; Diffuse reflectance infrared fourier transforms spectroscopies; Fe$-2$/O$-3$; Formation process; Heterogeneous reactions; NH$-3$; NO $-2$; Research areas; SO$-2$; Sulphate formation process; Sulphates; Fourier transform infrared spectroscopy; ammonia; dimer; ferric oxide; nitrogen dioxide; nitrous acid; sulfate; sulfur dioxide; sulfuric acid; water; ammonia; heterogeneity; hydrolysis; inhibition; neutralization; sulfur dioxide; transfer function; water vapor; aerosol; Article; chemical reaction kinetics; diffuse reflectance infrared Fourier transform spectroscopy; drought; gas flow; hydrolysis; proton transport; reaction analysis; reaction time; relative humidity; room temperature; surface property; water vapor
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/248288
作者单位	Key Laboratory of Oasis Ecology, College of Resource and Environment Sciences, Xinjiang University, Urumqi, 830046, China; Institute of Chemical Physics, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, China
推荐引用方式 GB/T 7714	He X.,Wu J.-J.,Ma Z.-C.,et al. NH3-promoted heterogeneous reaction of SO2 to sulfate on α-Fe2O3 particles with coexistence of NO2 under different relative humidities[J],2021,262.
APA	He X.,Wu J.-J.,Ma Z.-C.,Xi X.,&Zhang Y.-H..(2021).NH3-promoted heterogeneous reaction of SO2 to sulfate on α-Fe2O3 particles with coexistence of NO2 under different relative humidities.ATMOSPHERIC ENVIRONMENT,262.
MLA	He X.,et al."NH3-promoted heterogeneous reaction of SO2 to sulfate on α-Fe2O3 particles with coexistence of NO2 under different relative humidities".ATMOSPHERIC ENVIRONMENT 262(2021).