Oscillatory oxidation of benzaldehyde by air. 1. Experimental observations
- Univ. of Oregon, Eugene (USA)
In 90% aqueous acetic acid at 70 C, the oxidation of benzaldehyde to benzoic acid by air is catalyzed by a mixture of cobalt(II) and bromide. Jensen has shown that the concentration of cobalt(III) undergoes major oscillations during the reaction. Consistent with these prior observations, the authors find that the rate of formation of cobalt(III) increases exponentially until at about 10{sup {minus}5} M s{sup {minus}1} it becomes comparable to the maximum rate at which O{sub 2} can be transported from atmosphere to solution. A virtually discontinuous change of behavior then causes the concentration of cobalt(III) to decrease at about 10{sup {minus}4} M s{sup {minus}1}; the rate of this decrease is almost constant and independent of (Co{sup III}) until most of this species has been consumed. The authors have examined most of the subsystems that they could prepare and study independently. Among other observations, they find that increasing acidity increases the rate at which bromide catalyzes the oxidation of benzaldehyde by cobalt(III).
- OSTI ID:
- 5289971
- Journal Information:
- Journal of the American Chemical Society; (United States), Journal Name: Journal of the American Chemical Society; (United States) Vol. 112:24; ISSN 0002-7863; ISSN JACSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
ACETIC ACID
ALDEHYDES
BENZALDEHYDE
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
DATA
EXPERIMENTAL DATA
INFORMATION
MEASURING METHODS
MEDIUM TEMPERATURE
MONOCARBOXYLIC ACIDS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXIDATION
SPECTROPHOTOMETRY