Heterogeneous reaction of SO2 with soot: The roles of relative humidity and surface composition of soot in surface sulfate formation

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 大气污染控制中心

	Heterogeneous reaction of SO2 with soot: The roles of relative humidity and surface composition of soot in surface sulfate formation
	He, Hong; Liu, Yongchun; Ma, Jinzhu; Ma, Qingxin; Zhao, Yan
刊名	ATMOSPHERIC ENVIRONMENT
	2017-03-01
卷号	152 期号:0 页码:465-476
关键词	Soot So2 Relative Humidity Surface Composition Sulfate Formation
英文摘要	The conversion of SO2 to sulfates on the surface of soot is still poorly understood. Soot samples with different fractions of unsaturated hydrocarbons and oxygen-containing groups were prepared by corn busting n-hexane under well-controlled conditions. The heterogeneous reaction of SO2 with soot was investigated using in situ attenuated total internal reflection infrared (ATR-IR) spectroscopy, ion chromatography (IC) and a flow tube reactor at the ambient pressure and relative humidity (RH). Water promoted 502 adsorption and sulfate formation at the RH range from 6% to 70%, while exceeded water condensed on soot was unfavorable for sulfate formation due to inhibition of SO2 adsorption when RH was higher than 80%. The surface composition of soot, which was governed by combustion conditions, also played an important role in the heterogeneous reaction of SO2 with soot. This effect was found to greatly depend on RH. At low RH of 6%, soot with the highest fuel/oxygen ratio of 0.162 exhibited a maximum uptake capacity for SO2 because it contained a large amount of aromatic C-H groups, which acted as active sites for SO2 adsorption. At RH of 54%, soot produced with a fuel/oxygen ratio of 0.134 showed the highest reactivity toward SO2 because it contained appropriate amounts of aromatic C-H groups and oxygen-containing groups, subsequently leading to the optimal surface concentrations of both SO2 and water. These results suggest that variation in the surface composition of soot from different sources and/or resulting from chemical aging in the atmosphere likely affects the conversion of SO2 to sulfates. (C) 2017 Elsevier Ltd. All rights reserved.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/39200]
专题	生态环境研究中心_大气污染控制中心
推荐引用方式 GB/T 7714	He, Hong,Liu, Yongchun,Ma, Jinzhu,et al. Heterogeneous reaction of SO2 with soot: The roles of relative humidity and surface composition of soot in surface sulfate formation[J]. ATMOSPHERIC ENVIRONMENT,2017,152(0):465-476.
APA	He, Hong,Liu, Yongchun,Ma, Jinzhu,Ma, Qingxin,&Zhao, Yan.(2017).Heterogeneous reaction of SO2 with soot: The roles of relative humidity and surface composition of soot in surface sulfate formation.ATMOSPHERIC ENVIRONMENT,152(0),465-476.
MLA	He, Hong,et al."Heterogeneous reaction of SO2 with soot: The roles of relative humidity and surface composition of soot in surface sulfate formation".ATMOSPHERIC ENVIRONMENT 152.0(2017):465-476.