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Formation of formic acid and organic peroxides in the ozonolysis of ethene with added water vapour
Author(s) -
Horie Osamu,
Neeb Peter,
Limbach Stefan,
Moortgat Geert K.
Publication year - 1994
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 - 10.1029/94gl01174
Subject(s) - formic acid , ozonolysis , chemistry , radical , water vapor , glycolaldehyde , ozone , peroxide , hydroxymethyl , photochemistry , organic peroxide , hydrogen peroxide , inorganic chemistry , organic chemistry , catalysis , copolymer , polymer
Ozonolysis of C 2 H 4 was carried out in a 580 l glass reaction vessel at 1–5 ppm reactant concentrations, with added water vapour. Under dry conditions ([H 2 O] 0 = 0.5 ppm), HCHO, CO, CO 2 , (CHO) 2 O (formic acid anhydride), H 2 O 2 , and CH 3 OOH were identified as the reaction products. Under wet conditions ([H 2 O] 0 = 2 × 10 4 ppm), HCOOH yields approaching ca. 20% of the converted C 2 H 4 , were observed, while no (CHO) 2 O was formed. Hydroxymethyl hydroperoxide, HOCH 2 OOH, was observed as the major peroxide, and found to be formed only in the presence of water vapour. Direct reactions of H 2 O vapour with the excited CH 2 OO * radicals and with stabilized CH 2 OO radicals are postulated to explain the formation of HCOOH and HOCH 2 OOH in the presence of water vapour, respectively.