Sulfate formation through copper-catalyzed SO2 oxidation by NO2 at aerosol surfaces

Pai Liu; YuXin Li; Qishen Huang; Xinyue Chao; MingRui Zhong; Xiaowu Zhang; Jiayi Yin; Linfang Li; Xiyuan Kang; Shufeng Pang; Weigang Wang; Yunhong Zhang; Maofa Ge

Sulfate formation through copper-catalyzed SO2 oxidation by NO2 at aerosol surfaces

投稿的翻译标题: 气溶胶界面铜离子催化二氧化氮氧化二氧化硫形成硫酸盐

Pai Liu
, YuXin Li
, Qishen Huang^*
, Xinyue Chao
, MingRui Zhong
, Xiaowu Zhang
, Jiayi Yin
, Linfang Li
, Xiyuan Kang
, Shufeng Pang
, Weigang Wang
, Yunhong Zhang^*
, Maofa Ge^*

^*此作品的通讯作者

Beijing Institute of Technology
Beijing Institute of Technoogy
Beijing Institute ofTechnology (BIT)
Beijing National Laboratory for Molecular Sciences

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摘要

Severe urban air pollution in China is driven by a synergistic conversion of SO2, NOx, and NH3 into fine particulate matter (PM2.5). Field studies indicated NO2 as an important oxidizer to SO2 in polluted atmospheres with low photochemical reactivity, but this rapid reaction cannot be explained by the aqueous reactive nitrogen chemistry in acidic urban aerosols. Here, using an aerosol optical tweezer and Raman spectroscopy, we show that the multiphase SO2 oxidation by NO2 is accelerated for two-order-of-magnitude by a copper catalyst. This reaction occurs on aerosol surfaces, is independent of pH between 3 and 5, and produces sulfate by a rate of up to 10 µg m-3air hr-1 when reactive copper reaches a millimolar concentration in aerosol water – typical of severe haze events in North China Plain. Since copper and NO2 are companion emitters in air pollution, they can act synergistically in converting SO2 into sulfate in China’s haze.

投稿的翻译标题	气溶胶界面铜离子催化二氧化氮氧化二氧化硫形成硫酸盐
源语言	英语
页（从-至）	1-11
页数	12
期刊	npj Climate and Atmospheric Science
卷	8
出版状态	已出版 - 18 2月 2025

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title = "Sulfate formation through copper-catalyzed SO2 oxidation by NO2 at aerosol surfaces",

abstract = "Severe urban air pollution in China is driven by a synergistic conversion of SO2, NOx, and NH3 into fine particulate matter (PM2.5). Field studies indicated NO2 as an important oxidizer to SO2 in polluted atmospheres with low photochemical reactivity, but this rapid reaction cannot be explained by the aqueous reactive nitrogen chemistry in acidic urban aerosols. Here, using an aerosol optical tweezer and Raman spectroscopy, we show that the multiphase SO2 oxidation by NO2 is accelerated for two-order-of-magnitude by a copper catalyst. This reaction occurs on aerosol surfaces, is independent of pH between 3 and 5, and produces sulfate by a rate of up to 10 µg m-3air hr-1 when reactive copper reaches a millimolar concentration in aerosol water {\textendash} typical of severe haze events in North China Plain. Since copper and NO2 are companion emitters in air pollution, they can act synergistically in converting SO2 into sulfate in China{\textquoteright}s haze.",

author = "Pai Liu and YuXin Li and Qishen Huang and Xinyue Chao and MingRui Zhong and Xiaowu Zhang and Jiayi Yin and Linfang Li and Xiyuan Kang and Shufeng Pang and Weigang Wang and Yunhong Zhang and Maofa Ge",

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T1 - Sulfate formation through copper-catalyzed SO2 oxidation by NO2 at aerosol surfaces

AU - Liu, Pai

AU - Li, YuXin

AU - Huang, Qishen

AU - Chao, Xinyue

AU - Zhong, MingRui

AU - Zhang, Xiaowu

AU - Yin, Jiayi

AU - Li, Linfang

AU - Kang, Xiyuan

AU - Pang, Shufeng

AU - Wang, Weigang

AU - Zhang, Yunhong

AU - Ge, Maofa

PY - 2025/2/18

Y1 - 2025/2/18

N2 - Severe urban air pollution in China is driven by a synergistic conversion of SO2, NOx, and NH3 into fine particulate matter (PM2.5). Field studies indicated NO2 as an important oxidizer to SO2 in polluted atmospheres with low photochemical reactivity, but this rapid reaction cannot be explained by the aqueous reactive nitrogen chemistry in acidic urban aerosols. Here, using an aerosol optical tweezer and Raman spectroscopy, we show that the multiphase SO2 oxidation by NO2 is accelerated for two-order-of-magnitude by a copper catalyst. This reaction occurs on aerosol surfaces, is independent of pH between 3 and 5, and produces sulfate by a rate of up to 10 µg m-3air hr-1 when reactive copper reaches a millimolar concentration in aerosol water – typical of severe haze events in North China Plain. Since copper and NO2 are companion emitters in air pollution, they can act synergistically in converting SO2 into sulfate in China’s haze.

AB - Severe urban air pollution in China is driven by a synergistic conversion of SO2, NOx, and NH3 into fine particulate matter (PM2.5). Field studies indicated NO2 as an important oxidizer to SO2 in polluted atmospheres with low photochemical reactivity, but this rapid reaction cannot be explained by the aqueous reactive nitrogen chemistry in acidic urban aerosols. Here, using an aerosol optical tweezer and Raman spectroscopy, we show that the multiphase SO2 oxidation by NO2 is accelerated for two-order-of-magnitude by a copper catalyst. This reaction occurs on aerosol surfaces, is independent of pH between 3 and 5, and produces sulfate by a rate of up to 10 µg m-3air hr-1 when reactive copper reaches a millimolar concentration in aerosol water – typical of severe haze events in North China Plain. Since copper and NO2 are companion emitters in air pollution, they can act synergistically in converting SO2 into sulfate in China’s haze.

M3 - Article

SN - 2397-3722

VL - 8

SP - 1

EP - 11

JO - npj Climate and Atmospheric Science

JF - npj Climate and Atmospheric Science

ER -

Sulfate formation through copper-catalyzed SO2 oxidation by NO2 at aerosol surfaces

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