大气中SO2和HCOOH在CaO表面的耦合相互作用

doi:10.6023/A14120875

化学学报 ›› 2015, Vol. 73 ›› Issue (2): 131-136.DOI: 10.6023/A14120875 上一篇下一篇

研究论文

大气中SO₂和HCOOH在CaO表面的耦合相互作用

吴玲燕^a, 佟胜睿^b, 葛茂发^b

a 中国气象局大气化学重点开放实验室中国气象科学研究院北京 100081;
b 分子动态与稳态结构国家重点实验室北京分子科学国家实验室中国科学院化学研究所北京 100190

投稿日期:2014-12-19 发布日期:2015-01-12
通讯作者: 葛茂发, gemaofa@iccas.ac.cn; Tel.: 010-62554518 E-mail:gemaofa@iccas.ac.cn
基金资助:
项目受国家自然科学基金(Nos. 41405118, 41105085)、中国气象科学研究院基本科研业务费专项资金(No. 2014Y007)、中国科学院先导专项(Grant No. XDB05010400)资助.

Synergistic Effect between SO₂ and HCOOH on the Surface of CaO

Wu Lingyan^a, Tong Shengrui^b, Ge Maofa^b

a Key Laboratory for Atmospheric Chemistry, Chinese Academy of Meteorological Sciences, Beijing 100081;
b State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190

Received:2014-12-19 Published:2015-01-12
Supported by:
Project supported by the National Natural Science Foundation of China (Nos. 41405118, 41105085), the Basic Scientific Research Progress of The Chinese Academy of Meteorological Sciences (No. 2014Y007), the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant No. XDB05010400).

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摘要/Abstract

矿物气溶胶表面非均相反应由于可以改变气溶胶理化性质以及大气痕量气体平衡而成为大气化学的研究热点. 然而目前关于痕量气体在矿物气溶胶表面的共同吸附研究却很有限. 本研究中采用原位漫反射红外光谱研究了大气中SO₂和HCOOH在CaO表面的耦合相互作用. 通过分析红外光谱以及获取动力学曲线发现SO₂和HCOOH在CaO颗粒物表面非均相反应相互抑制, 同时通入两种气体时表面产物甲酸盐和亚硫酸盐都减少. 通过分步实验发现SO₂和HCOOH在CaO表面的耦合相互作用主要分为两个方面. SO₂共同存在时可供吸附的反应活性位点变少从而抑制HCOOH在颗粒物表面反应, 导致产物甲酸盐生成量减少. 另一方面对于SO₂在CaO表面的非均相反应而言, HCOOH会阻止SO₂在颗粒物表面的非均相反应, 使得表面生成亚硫酸盐减少.

关键词: 矿物气溶胶, 非均相反应, 漫反射红外光谱, 甲酸盐, 亚硫酸盐

Due to altering the properties of particles and the budget of trace gases, heterogeneous reactions on mineral aerosols become an important subject in the atmospheric chemistry. However, synergistic effects between trace gases on the surface of mineral aerosol are largely uncertain. In this work, the synergistic effect between SO₂ and HCOOH on the surface of CaO was studied using in situ Diffusion Reflectance Infrared Fourier Spectroscopy (DRIFTS). From analysing of the spectral features and obtaining the kinetic curves, it is found that the heterogeneous reactions of SO₂ and HCOOH on the surface of CaO blocked each other. In addtion, the formate and sulfite decreased when SO₂ and HCOOH were introduced into the reaction chamber simultaneously. Synergistic effect between SO₂ and HCOOH on the surface of CaO was mainly divided into two aspects according to step-by-step experiments. Less reactive sites available for adsorption because of the coexisting of SO₂ inhibited the reaction of HCOOH on the surface of CaO, resulting in the decrease of the formation of formate. On the other hand, HCOOH could prevent SO₂ from reacting with CaO so that the formation of sulfite decreased.

Key words: mineral aerosol, heterogeneous reaction, DRIFTS, formate, sulfite

引用此文

吴玲燕, 佟胜睿, 葛茂发. 大气中SO₂和HCOOH在CaO表面的耦合相互作用[J]. 化学学报, 2015, 73(2): 131-136.

Wu Lingyan, Tong Shengrui, Ge Maofa. Synergistic Effect between SO₂ and HCOOH on the Surface of CaO[J]. Acta Chim. Sinica, 2015, 73(2): 131-136.

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大气中SO₂和HCOOH在CaO表面的耦合相互作用

Synergistic Effect between SO₂ and HCOOH on the Surface of CaO

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