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Role of Carbonaceous Aerosols in Catalyzing Sulfate Formation
He, Guangzhi; Ma, Jinzhu; He, Hong
2018-05-01
Source PublicationACS CATALYSIS
ISSN2155-5435
Volume8Issue:5Pages:3825-3832
AbstractThe persistent and fast formation of sulfate is a primary factor driving the explosive growth of fine particles and exacerbating China's severe haze development. However, the underlying mechanism for the persistent production of sulfate remains highly uncertain. Here, we demonstrate that soot is not only a major component of the particulate matter but also a natural carbocatalyst to activate molecular O-2 and catalyze the oxidation of SO2 to sulfate under ambient conditions. Moreover, high relative humidity, typically occurring in severe haze events, can greatly accelerate the catalytic cycle by reducing the reaction barriers, leading to faster sulfate production. The formation pathway of sulfate catalyzed by carbonaceous soot aerosols uses the ubiquitous O-2 as the ultimate oxidant and can proceed at night when photochemistry is reduced. The high relative humidity during haze episodes can further promote the soot-catalyzed sulfate-producing process. Therefore, this study reveals a missing and widespread source for the persistent sulfate haze formation in the open atmosphere, particularly under highly polluted conditions characterized by high concentrations of both SO2 and particulate carbon, and is helpful to the development of more efficient policies to mitigate and control haze pollution.
Department大气污染控制中心
Keywordcarbocatalyst O-2 activation catalytic oxidation of SO2 sources of sulfate secondary aerosols haze formation first-principles calculations
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/40831
Collection大气环境与污染控制实验室
Recommended Citation
GB/T 7714
He, Guangzhi,Ma, Jinzhu,He, Hong. Role of Carbonaceous Aerosols in Catalyzing Sulfate Formation[J]. ACS CATALYSIS,2018,8(5):3825-3832.
APA He, Guangzhi,Ma, Jinzhu,&He, Hong.(2018).Role of Carbonaceous Aerosols in Catalyzing Sulfate Formation.ACS CATALYSIS,8(5),3825-3832.
MLA He, Guangzhi,et al."Role of Carbonaceous Aerosols in Catalyzing Sulfate Formation".ACS CATALYSIS 8.5(2018):3825-3832.
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