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A Mass‐spectrometric study of propionaldehyde oxidation in the negative temperature coefficient region
Author(s) -
Kaiser E. W.
Publication year - 1983
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.550151005
Subject(s) - propionaldehyde , chemistry , radical , mass spectrometry , partition coefficient , analytical chemistry (journal) , sticking coefficient , torr , yield (engineering) , acetaldehyde , chromatography , organic chemistry , ethanol , thermodynamics , physics , adsorption , desorption
The oxidation of propionaldehyde has been investigated in a 1‐L Pyrex reactor at total pressures of 50–120 torr and temperatures 553–713 K. Detection of reactants and products was principally by molecular beam mass spectrometry, although certain species could only be measured by gas‐chromatographic analysis. At 553 K the yield of water was ∼83% of the propionaldehyde consumed, leading to the conclusion that OH is the principal chain carrier near the beginning of the negative temperature coefficient region. Many oxygenated organics (CH 2 O, CH 3 CHO, C 2 H 5 OH, C 2 H 5 O 2 H, CH 3 O 2 H) and C 2 H 4 are formed during the oxidation process. These oxidation products are consistent with the important role of O 2 addition to C 2 H 5 radicals at 553 K followed by subsequent reactions of the C 2 H 5 O 2 radical. As the temperature is increased, the product concentrations smoothly change to a much simpler distribution in which C 2 H 4 , H 2 O 2 , and CO are the dominant products.