Heterogeneous reaction of Cl2 and NO2 on γ-Al2O3: A potential formation pathway of secondary aerosols

Tang, Shande; Ma, Lingling; Luo, Min; Zhang, Zhaohui; Cao, Xingzhong; Huang, Zhuochun; Xia, Rui; Qiu, Ye; Feng, Shuo; Zhang, Peng; Xia, Chuanqin; Jin, Yongdong; Xu, Dong

doi:10.1016/j.atmosenv.2018.06.005

Cited by 5 publications

(3 citation statements)

References 73 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We should emphasize that lower OH concentrations favor the greater contribution of this reactive channel, which is the case for the heterogeneous chemistry of sea salt in the troposphere. Laboratory studies have shown that uptake often follows the general pattern of superactive sites dominating the heterogeneous chemistry of inorganic surfaces with reactive gaseous species, such as OH, NO x , Cl 2 , and HCl, which was observed in this study 6,14,15,24–26 . At low gaseous concentrations, the superactive sites facilitate different chemistries between hydroxylated and hydrated surface sites and gaseous reactive species in which the bulk material is not directly involved and instead surface morphology determines the heterogeneous reactivity of the aerosol material.…”

Section: Resultssupporting

confidence: 54%

“…Laboratory studies have shown that uptake often follows the general pattern of superactive sites dominating the heterogeneous chemistry of inorganic surfaces with reactive gaseous species, such as OH, NO x , Cl 2 , and HCl, which was observed in this study. 6,14,15,[24][25][26] At low gaseous concentrations, the superactive sites facilitate different chemistries between hydroxylated and hydrated surface sites and gaseous reactive species in which the bulk material is not directly involved and instead surface morphology determines the heterogeneous reactivity of the aerosol material. This suggests that the results of previous uptake studies should be revised by including new low-concentration reaction channels, which produce surface and gas phase products different from the expected ones.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Experimental study on HCl uptake by MgCl₂ and sea salt under humid conditions

2020

View full text Add to dashboard Cite

We studied HCl uptake by MgCl 2 and sea salt over a relative humidity (RH) range from 0% to 34% at 278-313 K using a differential bead-filled flow tube coupled to a high-pressure chemical ionization mass spectrometer. The results showed that dry MgCl 2 and sea salt are essentially inert to gaseous HCl with a probability of less than 10 −6 . However, under humid conditions, HCl was found to be efficiently taken up by wet inorganic surfaces. The HCl uptake coefficient for MgCl 2 and sea salt increased squarely with RH, reaching a value of 0.00123 and 0.00171, respectively, at 29% RH and 298 K. Such wetting behavior is even enhanced at elevated temperatures, with the coefficient reaching 0.00208 and 0.00239, respectively, at 313 K. Based on the study of the dependence of γ HCl on the initial HCl concentration, we estimate γ HCl as 0.012 at 24% RH at a typical HCl concentration in the troposphere. In addition, the observation of the remarkable enhancement in the OH uptake by the HCl-treated salts agrees with the results of our previous investigation, which suggested that water absorption on salts enhances γ OH by lowering the surface pH. The proposed mechanism of HCl uptake by sea salt aerosol has implications for ozone production in the marine boundary layer.

show abstract

Section: Resultssupporting

confidence: 54%

Section: Resultsmentioning

confidence: 99%

Experimental study on HCl uptake by MgCl₂ and sea salt under humid conditions

2020

View full text Add to dashboard Cite

show abstract

“…, S10a). The nitrite would react with another surface nitrite in a Langmuir-Hinshelwood mechanism (R.3) or gaseous NO2 in an Eley-Rideal mechanism (R.4) to form nitrate in the absence of illumination(Tang et al, 2018;Underwood et al, 1999). Oxygen also acts as a promoter in the nitrite oxidation(Tang et al, 2018).…”

mentioning

confidence: 99%

Is the photochemistry activity weak during haze events? – A novel exploration on the photoinduced heterogeneous reaction of NO2 on mineral dust

Wang

Liu

Deng

et al. 2019

Preprint

View full text Add to dashboard Cite

Abstract. Despite the increased awareness of heterogeneous reaction on mineral dust, the knowledge of how the intensity of solar irradiation influences the photochemistry activity remains a crucially important part in atmospheric research. Relevant studies have not seriously discussed the photochemistry under weak sunlight during haze, and thus ignored some underlying pollution and toxicity. Here, we investigated the heterogeneous formation of nitrate and nitrite under various illumination conditions by laboratory experiments and field observations. Observed by in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), water-solvated nitrate was the main surface product, followed by other species varying with illumination condition. The growth of nitrate formation rate tends to be slow after the initial fast with increasing light intensity. For example, the geometric uptake coefficient (γgeo) under 30.5&thinsp;mW/cm2 (5.72&thinsp;&times;&thinsp;10&minus;6) has exceeded the 50&thinsp;% of that under 160&thinsp;mW/cm2 (1.13&thinsp;&times;&thinsp;10&minus;5). This case can be explained by the excess NO2 adsorption under weak illumination while the excess photoinduced active species under strong irradiation. Being negatively associated with nitrate (R2&thinsp;=&thinsp;0.748, P&thinsp;<&thinsp;0.01), nitrite acts as the intermediate and decreases with increasing light intensity via oxidation pathways. Similar negative dependence appears in coarse particles collected during daytime (R2&thinsp;=&thinsp;0.834, P&thinsp;<&thinsp;0.05), accompanied by the positive association during nighttime (R2&thinsp;=&thinsp;0.632, P&thinsp;<&thinsp;0.05), suggesting illumination a substantial role in atmospheric nitrogen cycling. Overall, for the nitrate formation, the conspicuous response under slight illumination offers opportunities to explain the secondary aerosol burst during haze episodes with weak irradiation. Additionally, high nitrite levels accompanied by low nitrate concentrations may induce great health risk which was previously neglected. Further, Monte Carlo simulation coupled with sensitivity analysis may provide a new insight in the estimations of kinetics parameters for atmospheric modelling studies.

show abstract

Quantification of secondary particle loading during a heavy air pollution event in Beijing: A simplified method based on coal emission indicators

Ouyang

Song

et al. 2019

Atmospheric Environment

View full text Add to dashboard Cite

Heterogeneous reaction of Cl2 and NO2 on γ-Al2O3: A potential formation pathway of secondary aerosols

Cited by 5 publications

References 73 publications

Experimental study on HCl uptake by MgCl₂ and sea salt under humid conditions

Experimental study on HCl uptake by MgCl₂ and sea salt under humid conditions

Is the photochemistry activity weak during haze events? – A novel exploration on the photoinduced heterogeneous reaction of NO<sub>2</sub> on mineral dust

Quantification of secondary particle loading during a heavy air pollution event in Beijing: A simplified method based on coal emission indicators

Contact Info

Product

Resources

About

Heterogeneous reaction of Cl2 and NO2 on γ-Al2O3: A potential formation pathway of secondary aerosols

Cited by 5 publications

References 73 publications

Experimental study on HCl uptake by MgCl2 and sea salt under humid conditions

Experimental study on HCl uptake by MgCl2 and sea salt under humid conditions

Is the photochemistry activity weak during haze events? – A novel exploration on the photoinduced heterogeneous reaction of NO&lt;sub&gt;2&lt;/sub&gt; on mineral dust

Quantification of secondary particle loading during a heavy air pollution event in Beijing: A simplified method based on coal emission indicators

Contact Info

Product

Resources

About

Experimental study on HCl uptake by MgCl₂ and sea salt under humid conditions

Experimental study on HCl uptake by MgCl₂ and sea salt under humid conditions

Is the photochemistry activity weak during haze events? – A novel exploration on the photoinduced heterogeneous reaction of NO<sub>2</sub> on mineral dust