Thermal unimolecular decomposition of nitrous oxide at low pressures

Journal Article · Thu Oct 10 04:00:00 EDT 1985 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100267a035· OSTI ID:6306514

Loirat, H; Caralp, F; Forst, W; Schoenenberger, C

The thermal decomposition of nitrous oxide, pure and in mixtures with N/sub 2/ and CO/sub 2/, was studied in a quartz vessel in the temperature range from 1080 to 1227 K at concentrations ranging from 10/sup -7/ to 1.5 x 10/sup -6/ mol/cm/sup 3/, the lowest of which represents a concentration almost two orders of magnitude lower than in most previous studies. It is found that activation energy, based on both the raw experimental data and data corrected for heterogeneity, shows continued falloff with pressure with no indication of reaching a limit at the lowest pressure studied. This is in accord with the prediction of the theory of Lorquet, Lorquet, and Forst (LLF), and in considerable disagreement with the recommended values of Baulch et al. The LLF theory reproduces fairly well the experimental concentration dependence of both the rate constant and activation energy, but experiment seems to indicate that activation energy may fall off with pressure somewhat faster than predicted by theory. 21 references, 6 figures, 4 tables.

• Research Organization: Universite de Bordeaux, France
• OSTI ID: 6306514
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 89:21; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
ACTIVATION ENERGY
ARRHENIUS EQUATION
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DATA
DECOMPOSITION
ELEMENTS
ENERGY
EQUATIONS
EXPERIMENTAL DATA
INFORMATION
KINETICS
NITROGEN
NITROGEN COMPOUNDS
NITROGEN OXIDES
NITROUS OXIDE
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PREDICTION EQUATIONS
PYROLYSIS
QUANTITY RATIO
REACTION KINETICS
TEMPERATURE DEPENDENCE
THERMOCHEMICAL PROCESSES
TIME DEPENDENCE
VERY HIGH TEMPERATURE