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The effect of water on the heterogeneous reactions of SO2 and NH3 on the surfaces of alpha-Fe2O3 and gamma-Al2O3
Yang, Weiwei; Ma, Qingxin; Liu, Yongchun; Ma, Jinzhu; Chu, Biwu; He, Hong
2019-09-01
Source PublicationENVIRONMENTAL SCIENCE-NANO
ISSN2051-8153
Volume6Issue:9Pages:2749-2758
AbstractIn this study, a wall-coated flow tube reactor, in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and ion chromatography (IC) were used to investigate the effect of water on the heterogeneous reactions of SO2 and NH3 on the surfaces of alpha-Fe2O3 and gamma-Al2O3. Flow tube results show that water exhibited little effect on the initial uptake coefficients (gamma(BET)) of SO2 but the addition of NH3 increased the gamma(BET) at various relative humidity (RH) values on both alpha-Fe2O3 and gamma-Al2O3. The gamma(BET) of SO2 in the presence of NH3 was negatively RH dependent on alpha-Fe2O3, which decreased from (8.80 +/- 2.30) x 10(-6) at 9% RH to (2.24 +/- 0.71) x 10(-6) at 85% RH. In contrast, the gamma(BET) of SO2 in the presence of NH3 on gamma-Al2O3 increased from (1.32 +/- 0.45) x 10(-6) at 10% RH to (2.56 +/- 0.39) x 10(-6) at 74% RH. Surface product analysis by DRIFTS and IC shows that ammonium sulfate-like species formed, whereas the variation of SO42- and NH4+ with RH differed on Fe2O3 and Al2O3. With the increase of RH, sulfate tended to transform into bisulfate on Fe2O3 with copresence of NH3, whereas surface-coordinated sulfite transformed to water-solvated sulfite and water-solvated sulfate species on Al2O3 regardless of the presence of NH3. During this process, the amount of sulfate decreased with RH on Fe2O3, as opposed to that on Al2O3; yet the NH4+ was inhibited to form by adsorbed water on both surfaces. The different interaction mechanisms among water, NH3, and SO2 on Fe2O3 and Al2O3 as well as the atmospheric implications have been proposed.
Department大气污染控制中心
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/43159
Collection大气环境与污染控制实验室
Affiliation1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100085, Peoples R China
2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Ctr Excellence Urban Atmospher Environm, Inst Urban Environm, Xiamen 361021, Fujian, Peoples R China
Recommended Citation
GB/T 7714
Yang, Weiwei,Ma, Qingxin,Liu, Yongchun,et al. The effect of water on the heterogeneous reactions of SO2 and NH3 on the surfaces of alpha-Fe2O3 and gamma-Al2O3[J]. ENVIRONMENTAL SCIENCE-NANO,2019,6(9):2749-2758.
APA Yang, Weiwei,Ma, Qingxin,Liu, Yongchun,Ma, Jinzhu,Chu, Biwu,&He, Hong.(2019).The effect of water on the heterogeneous reactions of SO2 and NH3 on the surfaces of alpha-Fe2O3 and gamma-Al2O3.ENVIRONMENTAL SCIENCE-NANO,6(9),2749-2758.
MLA Yang, Weiwei,et al."The effect of water on the heterogeneous reactions of SO2 and NH3 on the surfaces of alpha-Fe2O3 and gamma-Al2O3".ENVIRONMENTAL SCIENCE-NANO 6.9(2019):2749-2758.
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