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Computer-simulated degradation of CF3Cl, CF2Cl2, and CFCl3 under electron beam irradiation Cover

Computer-simulated degradation of CF3Cl, CF2Cl2, and CFCl3 under electron beam irradiation

Open Access
|Jul 2023

Figures & Tables

Fig. 1.

Schematic diagram for the degradation of chlorofluoromethanes under electron beam treatment in wet air (N2–O2).

Fig. 2.

Degradation of 300 ppm CFCl3 under an electron beam in humid air: O2–N2 = 1:4, H2O= 300 ppm.

Fig. 3.

Degradation of 300 ppm CF2Cl2 under an electron beam in humid air: O2–N2 = 1:4, H2O = 300 ppm.

Fig. 4.

Degradation of 300 ppm CF3Cl under an electron beam in humid air: O2–N2 = 1:4, H2O = 300 ppm.

Fig. 5.

Effect of pollutant concentration on its removal efficiency in the air under EB irradiation: (a) CFCl3, (b) CF2Cl2, and (c) CF3Cl.

Fig. 6.

Effect of increasing humidity (water concentration) on the removal efficiency of 300 ppm CFCl3 under EB in simulated air.

Fig. 7.

Effect of water concentration on the removal efficiency of 300 ppm CFxCly in simulated air under EB irradiation: (a) CF2Cl2, (b) CF3Cl.

Fig. 8.

Predicted effect of dose rates on the removal efficiency of 300 ppm CFC at 13 kGy absorbed dose.

Fig. 9.

The removal efficiency of 300 ppm CFCl3 (a) and CF2Cl2 (b) decreases progressively with increasing O2 concentration (from 20% to 70%), N2 is the remaining gas.

Reaction rates at 298 K of different reactive species with selected chlorofluorocarbons and IP (in electronvolts)

Compoundethr ${\rm{e}}_{{\rm{thr}}}^ - $ (cm3·mol–1·s–1)OH (cm3·mol–1·s–1)O(1D) (cm3·mol–1·s–1)IP (eV)References
CFCl32.40 × 10–74.79 × 10–182.00 × 10–1011.77 ± 0.0234, 39–41
CF2Cl21.90 × 10-96.93 × 10–181.40 × 10–1012.05 ± 0.2429, 34, 41
CF3Cl4.20 × 10–137.01 × 10–184.00 × 10–1012.60 ± 0.2034
CF4Not available2.00 × 10–181.40 × 10–16
DOI: https://doi.org/10.2478/nuka-2023-0009 | Journal eISSN: 1508-5791 | Journal ISSN: 0029-5922
Language: English
Page range: 67 - 76
Submitted on: Nov 9, 2022
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Accepted on: Jan 26, 2023
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Published on: Jul 5, 2023
In partnership with: Paradigm Publishing Services
Publication frequency: 4 issues per year

© 2023 Stephen Kabasa, Yongxia Sun, Andrzej G. Chmielewski, Henrietta Nichipor, published by Institute of Nuclear Chemistry and Technology
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.