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Titolo: FTIR STUDIES OF REACTIONS BETWEEN THE NITRATE RADICAL AND HALOETHENES
Autore: NOREMSAUNE IMW; HJORTH J; NIELSEN CJ;
- Indirizzi:
- UNIV OSLO,DEPT CHEM,POB 1033 N-0315 OSLO NORWAY COMMISS EUROPEAN COMMUNITIES,JOINT RES CTR,INST ENVIRONM I-21020 ISPRA ITALY
- Titolo Testata:
- Journal of atmospheric chemistry
fascicolo: 3,
volume: 21,
anno: 1995,
pagine: 223 - 250
- SICI:
- 0167-7764(1995)21:3<223:FSORBT>2.0.ZU;2-H
- Fonte:
- ISI
- Lingua:
- ENG
- Soggetto:
- GAS-PHASE REACTIONS; FORMYL CHLORIDE; RATE CONSTANTS; NO3 RADICALS; CL; KINETICS; CHLOROETHENES; DECOMPOSITION; MECHANISM; CHEMISTRY;
- Keywords:
- NO3 RADICAL; CHLOROETHENE; GAS-PHASE FTIR; MECHANISM STUDY; RATE CONSTANT; ACID CHLORIDE; CL ATOM;
- Tipo documento:
- Article
- Natura:
- Periodico
- Settore Disciplinare:
- Science Citation Index Expanded
- Citazioni:
- 41
- Recensione:
- Indirizzi per estratti:
-
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- Citazione:
- I.M.W. Noremsaune et al., "FTIR STUDIES OF REACTIONS BETWEEN THE NITRATE RADICAL AND HALOETHENES", Journal of atmospheric chemistry, 21(3), 1995, pp. 223-250
Abstract
Products and mechanisms for the gas-phase reactions of NO3 radicals with CH2=CHCl, CH2=CCl2, CHCl=CCl2, cis-CHCl=CHCl and trans-CHCl=CHCl in air have been studied. The experiments were carried out at 295 +/- 2K and 740 +/- 5 Torr in a 480-L Teflon-coated reaction chamber and at295 +/- 2 K and 760 +/- 5 Torr in a 250-L stainless steel reactor. NO3 was generated by the thermal dissociation of N2O5. Experiments with (NO3)-N-15 and CD2CDCl have also been performed. The initially formed nitrate peroxynitrates decay into carbonyl compounds, nitrates, HCl and ClNO2. In adidtion, there are indications of nitrooxy acid chloridesbeing produced. The reactions with CH2=CCl2 and CHCl=CCl2 are more complex due to release of chlorine atoms which eventually lead to formation of chloroacid chlorides. A general reaction mechanism is proposed and the observed concentration-time profiles of reactants and productsare simulated for each compound. The rate constants for the initial step of NO3 addition to the chloroethenes are determined as: (2.6 +/- 0.5, 9.4 +/- 0.9, 2.0 +/- 0.4, and 1.4 +/- 0.4) x 10(-16) cm(3) molecule(-1) s(-1) for CH2=CHCl, CH2=CCl2, CHCl=CCl2 and cis-CHCl=CHCl, respectively.
ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 21/05/13 alle ore 22:24:46