DRIFTS and Knudsen cell study of the heterogeneous reactivity of SO 2 and NO 2 on mineral dust
DRIFTS and Knudsen cell study of the heterogeneous reactivity of SO 2 and NO 2 on mineral dust
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DOI：
10.5194/acp-3-2043-2003
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发表时间：
2003-11
影响因子：
6.3
通讯作者：
M. Ullerstam;M. Johnson;R. Vogt;E. Ljungström
中科院分区：
文献类型：
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作者：
M. Ullerstam;M. Johnson;R. Vogt;E. Ljungström
利用漫反射红外傅里叶变换光谱（DRIFTS）和Knudsen电池研究了二氧化氮在矿物粉尘上的非均相氧化SO2。这使得从动力学上描述硫酸盐和硝酸盐作为表面产物的形成以及反应物质的气相损失成为可能。测定了在so2和NO2中气相损失率均为一级。从DRIFTS实验中，以BET面积作为反应表面积，确定了硫酸盐形成的吸收系数约为10 - 10。在没有NO2的情况下，没有明显的硫酸盐形成。克努森细胞研究得出SO2和NO2的吸收系数分别为10.6和10.7数量级。单独引入SO2和NO2与同时引入SO2和NO2的试验相比，吸收无显著差异。
The heterogeneous oxidation of SO2 by NO2 on mineral dust was studied using Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) and a Knudsen cell. This made it possible to characterise, kinetically, both the formation of sulfate and nitrate as surface products and the gas phase loss of the reactive species. The gas phase loss rate was determined to be first order in both SO 2 and NO2. From the DRIFTS experiment the uptake coefficient, , for the formation of sulfate was determined to be of the order of 10 10 using the BET area as the reactive surface area. No significant formation of sulfate was seen in the absence of NO2. The Knudsen cell study gave uptake coefficients of the order of 10 6 and 10 7 for SO2 and NO2 respectively. There was no significant difference in uptake when SO 2 or NO2 were introduced individually compared to experiments in which SO2 and NO2 were present at the same time.