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1991
Conference Paper
Titel
The photodegradation of trichloroacetyl chloride and trichloroacetic acid in an aerosol smog chamber
Abstract
The UV absorption spectrum of trichloroacetyl chlorideis determined in the gas phase. The compound absorbs UV below 320 nm, and direct photolysis by a tropospheric solar simulator yields phosgene, HCl and trace amounts of CCl4. Surface assisted hydrolysis of trichloroacetyl chloride obscures the observed kinetics and leadsto the corresponding acid. The photodegradation of this hydrolysis product, trichloroacetic acid, yields phosgene, HCl and atomic Cl. The formation of CCl4 is observed to arise mainly from heterogeneous reactions involving acidic surfaces and to be catalyzed by HCl and NaCl aerosol, though the mechanism for the formation of the products remains unclear. The influence of NaCl aerosol at the mg m-3 level on the heterogeneous processes is investigated.
Konferenz
Language
English