SO2 Initiates the Efficient Conversion of NO2 to HONO on MgO Surface

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	SO2 Initiates the Efficient Conversion of NO2 to HONO on MgO Surface
	Liu, Chang; Wang, Tao; Ma, Qingxin; He, Hong; Wang, Zhe; Wang, Weihao; Liang, Yutong
刊名	ENVIRONMENTAL SCIENCE & TECHNOLOGY
	2017-04-04
卷号	51 期号:7 页码:3767-3775
关键词	Soot So2 Relative Humidity Surface Composition Sulfate Formation
英文摘要	Nitrous acid (HONG) is an important source of hydroxyl radical (OH) that determines the fate of many chemically active and climate relevant trace gases. However, the sources and the formation mechanisms of HONO remain poorly understood. In this study, the,effect of SO2 on the heterogeneous reactions of NO2 on MgO as a mineral dust surrogate was investigated. The reactivity of MgO to NO, is weak, while coexisting SO2 can increase the uptake coefficients of NO2 on MgO by 2-3 orders of magnitude. The uptake coefficients of NO2 on SO2-aged-MgO are independent of NO2 concentrations in the range of 20-160 ppbv and-relative humidity (0-70%RH). The reaction mechanism was demonstrated to be a redox reaction between NO2 and surface sulfite. In the presence of SO2, NO2 was reduced to nitrite under dry conditions, which could be further converted to gas-phase HONO in humid conditions. These results suggest that the reductive-effect of SO2 on the heterogeneous conversion of NO2 to HONO may have a significant contribution to the unknown sources of HONO-observed in polluted areas (for example, in China).
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/39212]
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	Liu, Chang,Wang, Tao,Ma, Qingxin,et al. SO2 Initiates the Efficient Conversion of NO2 to HONO on MgO Surface[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2017,51(7):3767-3775.
APA	Liu, Chang.,Wang, Tao.,Ma, Qingxin.,He, Hong.,Wang, Zhe.,...&Liang, Yutong.(2017).SO2 Initiates the Efficient Conversion of NO2 to HONO on MgO Surface.ENVIRONMENTAL SCIENCE & TECHNOLOGY,51(7),3767-3775.
MLA	Liu, Chang,et al."SO2 Initiates the Efficient Conversion of NO2 to HONO on MgO Surface".ENVIRONMENTAL SCIENCE & TECHNOLOGY 51.7(2017):3767-3775.