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Effect of competitive adsorption on polar stratospheric cloud reactions
Author(s) -
Mozurkewich Michael
Publication year - 1993
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/93gl00475
Subject(s) - adsorption , nitric acid , phase (matter) , polar , decomposition , chemistry , reaction mechanism , reaction rate , gas phase , analytical chemistry (journal) , inorganic chemistry , environmental chemistry , organic chemistry , catalysis , physics , astronomy
Existing laboratory data for reaction rates on ice and nitric acid trihydrate are interpreted in terms of a simple, speculative mechanism for these reactions. The mechanism assumes that the solid phase is either pure H 2 O or pure HNO 3 (H 2 O) 3 and that the state of the surface depends largely on the gas phase composition. This dependence is described by Langmuir adsorption isotherms. The adsorption of a nonreactive species can affect the rate of reaction by inhibiting the adsorption of reactive species. In particular, differences in reaction rates observed on ice and HNO 3 (H 2 O) 3 are attributed to the adsorption of gas phase HNO 3 produced by the decomposition of HNO 3 (H 2 O) 3 . The interpretation of heterogeneous reaction rates requires detailed measurements of the rates as a function of gas phase composition.