Chem. J. Chinese Universities ›› 2010, Vol. 31 ›› Issue (4): 751.

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Experimental Study of the Effects of Ammonium Nitrate on SO2 Gas-particle Transfer on the Surface of Atmospheric Aerosols

LIN Li, KONG Ling-Dong*, CHEN Jian-Min   

  1. Center for the Atmospheric Chemistry Study, Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, China
  • Received:2009-09-25 Online:2010-04-10 Published:2010-04-10
  • Contact: KONG Ling-Dong. E-mail: ldkong@fudan.edu.cn
  • Supported by:

    国家自然科学基金(批准号: 40775079, 40875073, 40728006和40533017)资助.

Abstract:

Heterogeneous oxidation of gaseous SO2 on NH4NO3-containing hematite compared to other NH4NO3-containing oxides(MgO, Al2O3, CaO, SiO2) were first studied using an in situ diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS). Obvious sulfate formation can be seen from the infrared spectrum of NH4NO3-containing oxides, and the catalytic activity of hematite is much higher compared to other oxides. Using BET area as the reactive surface area, the hematite sample containing 6%(mass fraction) of NH4NO3 presents the highest γBET value(2.42×10-9), which is about 1.8 times larger than that of hematite. No formation of sulfate is observed on the pure NH4NO3. The results show that appropriate NH4NO3 increases the sulfate formation while more NH4NO3 impedes. Mechanism is discussed.

Key words: NH4NO3-Containing aerosols; Sulfur dioxide; In-situ diffuse reflectance infrared Fourier transform spectroscopy; Heterogeneous reaction

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