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Measurement of the Rate of Hydrogen Peroxide Thermal Decomposition in a Shock Tube Using Quantum Cascade Laser Absorption Near 7.7 μm
Author(s) -
Sajid M. B.,
Essebbar Et.,
Javed T.,
Fittschen C.,
Farooq A.
Publication year - 2014
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.20827
Subject(s) - chemistry , hydrogen peroxide , arrhenius equation , decomposition , thermal decomposition , absorption (acoustics) , shock tube , analytical chemistry (journal) , reaction rate constant , hydrocarbon , rate equation , combustion , hydrogen , reactivity (psychology) , attenuation coefficient , shock wave , thermodynamics , activation energy , kinetics , organic chemistry , optics , medicine , physics , alternative medicine , pathology , quantum mechanics
Hydrogen peroxide (H 2 O 2 ) is formed during hydrocarbon combustion and controls the system reactivity under intermediate temperature conditions. Here, we measured the rate of hydrogen peroxide decomposition behind reflected shock waves using midinfrared absorption of H 2 O 2 near 7.7 µm. We performed the experiments in diluted H 2 O 2 /Ar mixtures between 930 and 1235 K and at three different pressures (1, 2, and 10 atm). Under these conditions, the decay of hydrogen peroxide is sensitive only to the decomposition reaction rate, H 2 O 2 + M → 2OH + M ( k 1 ). The second‐order rate coefficient at low pressures (1 and 2 atm) did not exhibit any pressure dependence, suggesting that the reaction was in the low‐pressure limit. The rate data measured at 10 atm exhibited falloff behavior. The measured decomposition rates can be expressed in Arrhenius forms as follows:k 1 ( 1and2atm )=10( 16 . 29 ± 0 . 12 )×exp ( − 21993 ± 301 / T )( cm 3mol− 1s − 1 )k 1 ( 10atm )=10( 15 . 24 ± 0 . 10 )×exp ( − 19955 ± 247 / T )( cm 3mol− 1s − 1 )