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Title: Mechanism and kinetics of the reactions of NO{sub 2} or HNO{sub 3} with alumina as a mineral dust model compound

Abstract

The reaction of alumina as a model substance for mineral aerosols with NO{sub 2} or HNO{sub 3} was studied using diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The formation of nitrate on the Al{sub 2}O{sub 3} surface was observed in both cases. In addition, during the initial phase of the NO{sub 2} reaction, intermediate nitrite formation was observed. The DRIFTS data provide insight into the reaction mechanism, which involves reaction of surface OH groups, the formation of a {l_brace}AlOOH{hor_ellipsis}NO{sub 2}{r_brace} adduct, and the formation of acidic OH groups. The reaction order in NO{sub 2} of 1.86 {+-} 0.1 was determined from a quantitative kinetic evaluation of a series of experiments with NO{sub 2} concentrations in the range of 10{sup 13} to 10{sup 15} molecules cm{sup {minus}3}. The reactive uptake coefficient, {gamma}, was determined from the infrared absorbance, which was calibrated by ion chromatography, and from the Al{sub 2}O{sub 3} Brunauer-Emmett-Teller (BET) surface area. {gamma} depended linearly on the NO{sub 2} concentration and varied from {gamma} = 7.3 x 10{sup {minus}10} to 1.3 x 10{sup {minus}8} for [NO{sub 2}] = 2.5 x 10{sup 13} to 8.5 x 10{sup 14} molecules cm{sup {minus}3}. Estimations of the atmospheric impact showed that at thesemore » above conditions ({gamma} = 10{sup {minus}9}) nitrate formation on mineral aerosol from the NO{sub 2} reaction would be negligible.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Ford Forschungszentrum Aachen GmbH (DE)
OSTI Identifier:
20075889
Resource Type:
Journal Article
Journal Name:
Journal of Physical Chemistry A: Molecules, Spectroscopy, Kinetics, Environment, amp General Theory
Additional Journal Information:
Journal Volume: 104; Journal Issue: 21; Other Information: PBD: 1 Jun 2000; Journal ID: ISSN 1089-5639
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; NITRIC ACID; NITROGEN DIOXIDE; ALUMINIUM OXIDES; AEROSOLS; DUSTS; CHEMICAL REACTION KINETICS; FOURIER TRANSFORM SPECTROMETERS

Citation Formats

Boerensen, C., Kirchner, U., Scheer, V., Vogt, R., and Zellner, R. Mechanism and kinetics of the reactions of NO{sub 2} or HNO{sub 3} with alumina as a mineral dust model compound. United States: N. p., 2000. Web. doi:10.1021/jp994170d.
Boerensen, C., Kirchner, U., Scheer, V., Vogt, R., & Zellner, R. Mechanism and kinetics of the reactions of NO{sub 2} or HNO{sub 3} with alumina as a mineral dust model compound. United States. doi:10.1021/jp994170d.
Boerensen, C., Kirchner, U., Scheer, V., Vogt, R., and Zellner, R. Thu . "Mechanism and kinetics of the reactions of NO{sub 2} or HNO{sub 3} with alumina as a mineral dust model compound". United States. doi:10.1021/jp994170d.
@article{osti_20075889,
title = {Mechanism and kinetics of the reactions of NO{sub 2} or HNO{sub 3} with alumina as a mineral dust model compound},
author = {Boerensen, C. and Kirchner, U. and Scheer, V. and Vogt, R. and Zellner, R.},
abstractNote = {The reaction of alumina as a model substance for mineral aerosols with NO{sub 2} or HNO{sub 3} was studied using diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The formation of nitrate on the Al{sub 2}O{sub 3} surface was observed in both cases. In addition, during the initial phase of the NO{sub 2} reaction, intermediate nitrite formation was observed. The DRIFTS data provide insight into the reaction mechanism, which involves reaction of surface OH groups, the formation of a {l_brace}AlOOH{hor_ellipsis}NO{sub 2}{r_brace} adduct, and the formation of acidic OH groups. The reaction order in NO{sub 2} of 1.86 {+-} 0.1 was determined from a quantitative kinetic evaluation of a series of experiments with NO{sub 2} concentrations in the range of 10{sup 13} to 10{sup 15} molecules cm{sup {minus}3}. The reactive uptake coefficient, {gamma}, was determined from the infrared absorbance, which was calibrated by ion chromatography, and from the Al{sub 2}O{sub 3} Brunauer-Emmett-Teller (BET) surface area. {gamma} depended linearly on the NO{sub 2} concentration and varied from {gamma} = 7.3 x 10{sup {minus}10} to 1.3 x 10{sup {minus}8} for [NO{sub 2}] = 2.5 x 10{sup 13} to 8.5 x 10{sup 14} molecules cm{sup {minus}3}. Estimations of the atmospheric impact showed that at these above conditions ({gamma} = 10{sup {minus}9}) nitrate formation on mineral aerosol from the NO{sub 2} reaction would be negligible.},
doi = {10.1021/jp994170d},
journal = {Journal of Physical Chemistry A: Molecules, Spectroscopy, Kinetics, Environment, amp General Theory},
issn = {1089-5639},
number = 21,
volume = 104,
place = {United States},
year = {2000},
month = {6}
}