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A molecular beam mass-spectrometric study of isopropyl nitrate pyrolysis reactions at short residence times and temperatures up to 700 K

Content Provider	Royal Society of Chemistry (RSC)
Author	Hansson, Tony Pettersson, Jan B. C. Holmlid, Leif
Copyright Year	1989
Abstract	The pyrolysis of isopropyl nitrate in the presence of NO was studied in a molecular beam mass spectrometer apparatus, with residence times in the hot part of the quartz reactor of ca. 30 ms. This method gives rapid quenching of the reaction and direct sight-line sampling, and is designed to optimize detection of intermediates and radicals. Temperatures up to 700 K and pressures of 200–300 mbar were used in this study. NO was added in the reactor at a partial pressure of 5–10 mbar. In the experiments, which give information on the very first reaction steps, isopropyl nitrite is shown to be a stable intermediate up to 490 K. From this molecule, several other species are formed by dissociation or reaction with methyl radicals and NO, and the nitrate reactions are thus similar to the nitrite reactions. In previous studies of isopropyl nitrate pyrolysis reactions the products very strongly with temperature. Our results show that this temperature variation is due to the existence of thermally labile species like isopropyl nitrite and methyl nitrite. More stable molecules like hydrocarbons provide sinks for the flux in the reaction scheme. Tentative identification of nitrosomethane CH3NO at intermediate temperatures and HCN at temperatures above 600 K is also made.
Starting Page	1413
Ending Page	1423
Page Count	11
File Format	PDF
ISSN	03009238
Volume Number	85
Issue Number	9
Journal	Journal of the Chemical Society, Faraday Transactions 2
DOI	10.1039/F29898501413
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Pyrolysis Partial pressure Nitrate Isopropyl nitrate Bar (unit) Propyl group Nitrite Dissociative Quartz Methyl nitrite Mass spectrometry
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Physical and Theoretical Chemistry

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