Reaction between NO/sub 3/ and CH/sub 2/O in air: a determination of the rate constant at 295 +/- 2 K

Journal Article · Thu May 05 04:00:00 EDT 1988 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100320a053· OSTI ID:7143846

Hjorth, J; Ottobrini, G; Restelli, G

The reaction between NO/sub 3/ and CH/sub 2/O was studied in a 450-L glass/Teflon chamber by using FT-IR spectroscopy as the analytical technique. NO/sub 3/ was obtained in equilibrium with N/sub 2/O/sub 5/ introduced from evaporation of the solid phase into the cell or generated in the cell itself by reacting NO/sub 2/ with O/sub 3/. Experiments were performed in both cases at 295 +/- 2 K and 740 Torr in purified air. /sup 13/CH/sub 2/O was used to avoid spurious effects on the measured CO; /sup 13/C/sup 18/O was introduced to estimate the OH radical concentration in the system from the buildup of the oxidation product /sup 16/O/sup 13/C/sup 18/O. /sup 13/CH/sub 2/O, /sup 13/C/sup 16/O, N/sub 2/O/sub 5/, O/sub 3/, NO/sub 2/, and H/sup 13/COOH time-dependent concentrations were measured and the data fitted on the basis of a model involving 31 reactions, with the aid of the FACSIMILE computer program. A rate constant for the reaction NO/sub 3/ + CH/sub 2/O equal to (5.4 +/- 1.1) x 10/sup -16/ cm/sup 3/ molecule/sup -1/ s/sup -1/, at 295 +/- 2 K and 740 Torr, has been obtained assuming for the reactions N/sub 2/O/sub 5/ in equilibrium /sup +M/ NO/sub 3/ + NO/sub 2/ an equilibrium constant equal to 5.3 x 10/sup 19/ molecules cm/sup -3/. Significant differences have been found between the measured concentrations of OH and HCOOH with respect to those predicted by the model. In the framework of this study, the absolute strength of the v/sub 6/ band of H/sup 12/COOH (1045-1150 cm/sup -1/) has been measured equal to (3.48 +/- 0.5) x 10/sup -17/ cm molecule/sup -1/.

• Research Organization: Commission of the European Communities, Ispra (Italy)
• OSTI ID: 7143846
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 92:9; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
500100 -- Environment
Atmospheric-- Basic Studies-- (-1989)
54 ENVIRONMENTAL SCIENCES
ALDEHYDES
CARBON 13
CARBON ISOTOPES
CARBOXYLIC ACIDS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COMPUTER CODES
DATA
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
F CODES
FORMALDEHYDE
FORMIC ACID
INFORMATION
ISOTOPE ENRICHED MATERIALS
ISOTOPES
KINETICS
LIGHT NUCLEI
MATERIALS
MEDIUM TEMPERATURE
MONOCARBOXYLIC ACIDS
NITROXYL RADICALS
NUCLEI
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN 18
OXYGEN ISOTOPES
RADICALS
REACTION KINETICS
STABLE ISOTOPES