Kinetics of NO3 Uptake on Pyrene as a Representative Organic Aerosols
Zelenov V. V., Aparina E. V., Kozlovskiy V. I., Sulimenkov I. V., Nosy'rev A. E.
Russian Journal of Physical Chemistry B
Vol.12, Issue2, P. 343-351
Опубликовано: 2018
Тип ресурса: Статья
DOI:10.1134/S1990793118020136
Аннотация:
The uptake of NO3 on a pyrene coating at [NO3] = 2.5 × 1012–1.2 × 1013 cm−3 is studied using a coated-insert flow tube reactor coupled to a mass spectrometer. It is established that, in this concentration range, the uptake occurs by the impact recombination mechanism, whereas the consumption of surface sites involves the unimolecular decomposition of stabilized surface complexes. Several hundreds of NO3 radicals are consumed per surface site destroyed. The uptake coefficient depends on the exposure time, being described by the expression γ(t) = γ0exp(−t/τ), where γ0 and τ are parameters dependent on the NO3 concentration. Based on the Langmuir adsorption concept, the following elementary parameters determining the uptake process are estimated: the Langmuir coefficient, KL = 7.1 × 10−13 cm3; the desorption rate constant, kd = 44 s−1; and the rate constant for the unimolecular heterogeneous conversion of surface complexes, kr = 6.6 × 10−2 s−1. Gas chromatography–mass spectrometry measure
Ключевые слова:
desorption rate constant; Langmuir coefficient; NO3; pyrene; rate constant; solid uptake products; troposphere chemistry; uptake coefficient
Язык текста: Английский
ISSN: 1990-7923
Zelenov V. V.
Aparina E. V.
Kozlovskiy V. I.
Sulimenkov I. V.
Nosy'rev A. E. Aleksandr Evgenyevich 1958-
Зеленов В. В.
Апарина Е. В.
Козловскиy В. И.
Сулименков И. В.
Носырев А. Е. Александр Евгеньевич 1958-
Kinetics of NO3 Uptake on Pyrene as a Representative Organic Aerosols
Текст визуальный непосредственный
Russian Journal of Physical Chemistry B
Pleiades Publishing, Ltd.
Vol.12, Issue2 P. 343-351
2018
Статья
desorption rate constant Langmuir coefficient NO3 pyrene rate constant solid uptake products troposphere chemistry uptake coefficient
The uptake of NO3 on a pyrene coating at [NO3] = 2.5 × 1012–1.2 × 1013 cm−3 is studied using a coated-insert flow tube reactor coupled to a mass spectrometer. It is established that, in this concentration range, the uptake occurs by the impact recombination mechanism, whereas the consumption of surface sites involves the unimolecular decomposition of stabilized surface complexes. Several hundreds of NO3 radicals are consumed per surface site destroyed. The uptake coefficient depends on the exposure time, being described by the expression γ(t) = γ0exp(−t/τ), where γ0 and τ are parameters dependent on the NO3 concentration. Based on the Langmuir adsorption concept, the following elementary parameters determining the uptake process are estimated: the Langmuir coefficient, KL = 7.1 × 10−13 cm3; the desorption rate constant, kd = 44 s−1; and the rate constant for the unimolecular heterogeneous conversion of surface complexes, kr = 6.6 × 10−2 s−1. Gas chromatography–mass spectrometry measure