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A kinetic study of the decomposition of HNO3 and its reaction with NO

✍ Scribed by Roger Svensson; Evert Ljungström

Publisher
John Wiley and Sons
Year
1988
Tongue
English
Weight
489 KB
Volume
20
Category
Article
ISSN
0538-8066

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✦ Synopsis

The rate of reaction between NO and HNOB and the rate of thermal decomposition of HN03 have been measured by FTIR spectroscopy. The measurements were made in a teflon lined batch reactor having a surface to volume ratio of 14 rn-'. During the experiments, with initial HN03 concentrations between 2 and 12 ppm and NO concentrations between 2 and 30 ppm, a reactant stoichiometry of unity and a first order NO and HNOB dependence were confirmed. The observed rate constant for the reaction HNO3 + NO -HNOp + NO, at 22°C and atmospheric pressure was determined to 1.1 (+0.3) ppm-' min-'. At atmospheric pressure, HN03 decomposes into NOz and other products with a first order HNO, dependence and with a rate constant of 2.0 (k0.2) min-'. The apparent activation energy for the decomposition is 13 (24) kJ mol-'.

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