Atmos. Chem. Phys. Discuss., 12, 165-191, 2012
www.atmos-chem-phys-discuss.net/12/165/2012/
doi:10.5194/acpd-12-165-2012
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Comparative study on the heterogeneous reaction between methylamine and ammonium salts
Y. Liu, C. Han, C. Liu, J. Ma, Q. Ma, and H. He
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China

Abstract. The heterogeneous uptake of methylamine (MA) onto (NH4)2SO4, NH4HSO4, NH4NO3 and NH4Cl was investigated using a Knudsen cell reactor coupled to a quadrupole mass spectrometer, in situ Raman spectrometer and theoretical calculations. Reversible exchange reactions between MA and NH4NO3 and NH4Cl were observed at 298 K. Irreversible exchange reaction and simple acid-base reaction for MA was found taking place on (NH4)2SO4 and NH4HSO4, respectively. The observed uptake coefficients of MA on (NH4)2SO4, NH4HSO4, NH4NO3 and NH4Cl at 298 K were measured to be 6.30±1.03×10−3, 1.78±0.36×10−2, 8.79±1.99×10−3 and 2.29±0.28×10−3, respectively. A linear free energy relationship was found for the heterogeneous reactions between MA and NH4Cl, (NH4)2SO4 and NH4NO3. Namely, the uptake coefficients of MA on these ammonium salts were linearly related to the electrostatic potential of the H atom in the NH4+ group.

Citation: Liu, Y., Han, C., Liu, C., Ma, J., Ma, Q., and He, H.: Comparative study on the heterogeneous reaction between methylamine and ammonium salts, Atmos. Chem. Phys. Discuss., 12, 165-191, doi:10.5194/acpd-12-165-2012, 2012.
 
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