Effect of relative humidity on O3 and NO2 oxidation of SO2 on α-Al2O3 particles

Wenjun Liu; Xiang He; Shufeng Pang; Yunhong Zhang

doi:10.1016/j.atmosenv.2017.08.028

Effect of relative humidity on O₃ and NO₂ oxidation of SO₂ on α-Al₂O₃ particles

Wenjun Liu, Xiang He, Shufeng Pang, Yunhong Zhang^*

^*Corresponding author for this work

School of Chemistry and Chemical Engineering

Research output: Contribution to journal › Article › peer-review

41 Citations (Scopus)

Abstract

Heterogeneous reactions of SO₂/O₃ and SO₂/NO₂ with α-Al₂O₃ particles at different RHs were investigated using a gas-flow system combined with microscopic Fourier transform infrared (micro-FTIR) spectrometer. The results show that the trace gas O₃ or NO₂ leads to rapid conversion of SO₂ to sulfate on the surface of α-Al₂O₃ particles in initial stage and then conversion rate decreases in the following stages. The rate of sulfate formation and uptake coefficient (γ) for SO₂ in the two systems as a function of relative humidity (RH) are determined for the first time, which are all strongly enhanced more than seven-fold as the RH increase from 15% to 95% in initial stage for SO₂/O₃ and SO₂/NO₂. Moreover, the γ in the system of SO₂/O₃ on α-Al₂O₃ particles is more than 3-fold than that of SO₂/NO₂ for the similar RH condition. Our results may be broadly applicable to understand the effects of RH and trace gases (e.g., O₃, NO₂) for the converting SO₂ into sulfate on the mineral dust, which supply basic data for atmospheric chemistry modeling studies.

Original language	English
Pages (from-to)	245-253
Number of pages	9
Journal	Atmospheric Environment
Volume	167
DOIs	https://doi.org/10.1016/j.atmosenv.2017.08.028
Publication status	Published - Oct 2017

Keywords

Heterogeneous reaction
Microscopic Fourier transform infrared
Relative humidity
Sulfate
Trace gases
α-AlO particles

Access to Document

10.1016/j.atmosenv.2017.08.028

Cite this

@article{55cb87b17e9c4c33b3b81215390ce739,

title = "Effect of relative humidity on O3 and NO2 oxidation of SO2 on α-Al2O3 particles",

abstract = "Heterogeneous reactions of SO2/O3 and SO2/NO2 with α-Al2O3 particles at different RHs were investigated using a gas-flow system combined with microscopic Fourier transform infrared (micro-FTIR) spectrometer. The results show that the trace gas O3 or NO2 leads to rapid conversion of SO2 to sulfate on the surface of α-Al2O3 particles in initial stage and then conversion rate decreases in the following stages. The rate of sulfate formation and uptake coefficient (γ) for SO2 in the two systems as a function of relative humidity (RH) are determined for the first time, which are all strongly enhanced more than seven-fold as the RH increase from 15% to 95% in initial stage for SO2/O3 and SO2/NO2. Moreover, the γ in the system of SO2/O3 on α-Al2O3 particles is more than 3-fold than that of SO2/NO2 for the similar RH condition. Our results may be broadly applicable to understand the effects of RH and trace gases (e.g., O3, NO2) for the converting SO2 into sulfate on the mineral dust, which supply basic data for atmospheric chemistry modeling studies.",

keywords = "Heterogeneous reaction, Microscopic Fourier transform infrared, Relative humidity, Sulfate, Trace gases, α-AlO particles",

author = "Wenjun Liu and Xiang He and Shufeng Pang and Yunhong Zhang",

note = "Publisher Copyright: {\textcopyright} 2017 Elsevier Ltd",

year = "2017",

month = oct,

doi = "10.1016/j.atmosenv.2017.08.028",

language = "English",

volume = "167",

pages = "245--253",

journal = "Atmospheric Environment",

issn = "1352-2310",

publisher = "Elsevier Ltd.",

}

TY - JOUR

T1 - Effect of relative humidity on O3 and NO2 oxidation of SO2 on α-Al2O3 particles

AU - Liu, Wenjun

AU - He, Xiang

AU - Pang, Shufeng

AU - Zhang, Yunhong

PY - 2017/10

Y1 - 2017/10

N2 - Heterogeneous reactions of SO2/O3 and SO2/NO2 with α-Al2O3 particles at different RHs were investigated using a gas-flow system combined with microscopic Fourier transform infrared (micro-FTIR) spectrometer. The results show that the trace gas O3 or NO2 leads to rapid conversion of SO2 to sulfate on the surface of α-Al2O3 particles in initial stage and then conversion rate decreases in the following stages. The rate of sulfate formation and uptake coefficient (γ) for SO2 in the two systems as a function of relative humidity (RH) are determined for the first time, which are all strongly enhanced more than seven-fold as the RH increase from 15% to 95% in initial stage for SO2/O3 and SO2/NO2. Moreover, the γ in the system of SO2/O3 on α-Al2O3 particles is more than 3-fold than that of SO2/NO2 for the similar RH condition. Our results may be broadly applicable to understand the effects of RH and trace gases (e.g., O3, NO2) for the converting SO2 into sulfate on the mineral dust, which supply basic data for atmospheric chemistry modeling studies.

AB - Heterogeneous reactions of SO2/O3 and SO2/NO2 with α-Al2O3 particles at different RHs were investigated using a gas-flow system combined with microscopic Fourier transform infrared (micro-FTIR) spectrometer. The results show that the trace gas O3 or NO2 leads to rapid conversion of SO2 to sulfate on the surface of α-Al2O3 particles in initial stage and then conversion rate decreases in the following stages. The rate of sulfate formation and uptake coefficient (γ) for SO2 in the two systems as a function of relative humidity (RH) are determined for the first time, which are all strongly enhanced more than seven-fold as the RH increase from 15% to 95% in initial stage for SO2/O3 and SO2/NO2. Moreover, the γ in the system of SO2/O3 on α-Al2O3 particles is more than 3-fold than that of SO2/NO2 for the similar RH condition. Our results may be broadly applicable to understand the effects of RH and trace gases (e.g., O3, NO2) for the converting SO2 into sulfate on the mineral dust, which supply basic data for atmospheric chemistry modeling studies.

KW - Heterogeneous reaction

KW - Microscopic Fourier transform infrared

KW - Relative humidity

KW - Sulfate

KW - Trace gases

KW - α-AlO particles

UR - http://www.scopus.com/inward/record.url?scp=85027580727&partnerID=8YFLogxK

U2 - 10.1016/j.atmosenv.2017.08.028

DO - 10.1016/j.atmosenv.2017.08.028

M3 - Article

AN - SCOPUS:85027580727

SN - 1352-2310

VL - 167

SP - 245

EP - 253

JO - Atmospheric Environment

JF - Atmospheric Environment

ER -

Effect of relative humidity on O₃ and NO₂ oxidation of SO₂ on α-Al₂O₃ particles

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this