NO2在黑碳表面的非均相反应

Heterogeneous Reactions of NO_2 on the Surface of Black Carbon

HONO是大气中OH自由基的重要来源,NO2在黑碳表面可反应生成HONO,因此NO2在黑碳表面的非均相反应引起了人们的关注。目前不同研究小组测量的摄取系数可相差7个数量级,选择不同的摄取系数去评估非均相反应的重要性将得到完全不同的结果。本文在深入分析NO2在黑碳表面反应机理的基础上,从反应体系、黑碳表面性质、反应条件等角度对不同小组测量的摄取系数存在差异的原因进行了分析,为模式中摄取系数的选取提供了依据。

HONO is the main source of hydroxyl radical （OH） in the atmosphere, and is formed by the reaction of NO2 on the surface of black carbon. Therefore, the heterogeneous reactions of NO2 on the surface of black carbon have been attracted scientists in the past years. The uptake coefficients varied 7 orders of magnitude in different research groups. For assessing the importance of the heterogeneous reaction, the results are different when selecting different uptake coefficients. On the basis of a deep analysis of the reaction mechanism of NO2 with black carbon, the reasons of the discrepancy in uptake coefficients were analyzed according to reaction system, surface properties of black carbon and reaction condition. The results will provide a basis for the selection of uptake coefficients in the model.