FTIR product study of the Cl-initiated oxidation products of CFC replacements: (/)-1,2,3,3,3-pentafluoropropene and hexafluoroisobutylene

A product study of the reactions of ( E / Z )-1,2,3,3,3-pentafluoropropene (( E / Z )-CF 3 CF&z.dbd;CHF) and hexafluoroisobutylene ((CF 3 ) 2 C&z.dbd;CH 2 ) initiated by Cl atoms were developed at 298 ± 2 K and atmospheric pressure. The experiments were carried out in a 1080 L quartz-glass e...

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Bibliographic Details
Published in:RSC advances 2021-04, Vol.11 (21), p.12739-12747
Main Authors: Rivela, Cynthia B, Gibilisco, Rodrigo G, Tovar, Carmen M, Barnes, Ian, Wiesen, Peter, Blanco, María B, Teruel, Mariano A
Format: Article
Language:English
Subjects:
Chemistry
Chlorofluorocarbon substitutes
Fourier transforms
Infrared spectroscopy
Oxidation
Test chambers
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Summary:A product study of the reactions of ( E / Z )-1,2,3,3,3-pentafluoropropene (( E / Z )-CF 3 CF&z.dbd;CHF) and hexafluoroisobutylene ((CF 3 ) 2 C&z.dbd;CH 2 ) initiated by Cl atoms were developed at 298 ± 2 K and atmospheric pressure. The experiments were carried out in a 1080 L quartz-glass environmental chamber coupled via in situ FTIR spectroscopy to monitor the reactants and products. The main products observed and their yields were as follows: CF 3 C(O)F (106 ± 9)% with HC(O)F (100 ± 8)% as a co-product for ( E / Z )-CF 3 CF&z.dbd;CHF, and CF 3 C(O)CF 3 (94 ± 5)% with HC(O)Cl (90 ± 7)% as a co-product for (CF 3 ) 2 C&z.dbd;CH 2 . Atmospheric implications of the end-product degradation are assessed in terms of their impact on ecosystems to help environmental policymakers consider HFOs as acceptable replacements. An experimental product distribution study and the atmospheric implications of the reactions of Cl with two fluorinated alkenes is provided.
ISSN:2046-2069
2046-2069
DOI:10.1039/d1ra00283j