A three-dimensional model of the atmospheric chemistry of E and Z-CF3CH=CHCl (HCFO-1233(zd) (E/Z))

Andersen, Mads Peter; Schmidt, Johan A.; Volkova, Αleksandra; Wuebbles, Donald J.

doi:10.1016/j.atmosenv.2018.02.018

Cited by 18 publications

(15 citation statements)

References 37 publications

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“…The previous studies reported that the use of HFO-1234yf instead of HFC-134a will likely result in enhanced and more localized TFA deposition. − Trifluoroacetaldehyde (CF 3 CHO) is the main degradation product of HFO-1234ze . CF 3 CHO can be partially degraded to TFA , and is mainly removed by photolysis. , Researchers have discrepancies on the yield of HFC-23 (CHF 3 ) production by photolysis of CF 3 CHO. − HFC-23 has the highest 100-year global warming potential (GWP) of 12 690 among HFCs with an atmospheric lifetime of 228 years . The formation of HFC-23 could lead to a secondary contribution to radiative forcing of parent HFOs …”

Section: Introductionmentioning

confidence: 99%

Projections of National-Gridded Emissions of Hydrofluoroolefins (HFOs) in China

Wang

Liu

Qiao

et al. 2023

Environ. Sci. Technol.

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Hydrofluoroolefins (HFOs) are being used as substitutes for potent greenhouse gas hydrofluorocarbons (HFCs). However, the use and environmental impacts of HFOs are of great concern due to the rapid degradation of HFOs to produce persistent and phytotoxic trifluoroacetic acid (TFA). Here, we provide a comprehensive projection of HFO emissions in China during 2024–2060 for the first time. Under the Kigali Amendment to the Montreal Protocol, China’s HFO emissions are estimated to increase from 1.7 (1.3–2.3) to 148.8 (111.4–185.4) kt in 2024–2060 with cumulative emissions of 2.8 (2.0–3.5) Gt, and cumulative reduced HFCs emissions are evaluated to be 5.4 Gt CO2-equivalent. High HFO emissions would be distributed mainly in the North China Plain and the eastern and coastal areas. HFO-1234yf (2,3,3,3-tetrafluoropropene) contributes most of HFO emissions with a cumulative emission of 1.7 Gt in 2024–2060, while the cumulative increment of TFA deposition from HFO-1234yf emissions would reach 0.4–1.0 Gt. The long-term national-gridded HFO emission inventories can provide scientific support for evaluating the environmental risks of HFOs and developing HFC phase-out pathways for addressing climate change.

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Section: Introductionmentioning

confidence: 99%

Projections of National-Gridded Emissions of Hydrofluoroolefins (HFOs) in China

Wang

Liu

Qiao

et al. 2023

Environ. Sci. Technol.

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“…8 Carbonyl uoride (FCFO) and triuoroacetaldehyde (CF 3 CHO) are formed from HFO-1234ze (CF 3 CH]CHF), 9 HFO-1336mzz (CF 3 CH]CHCF 3 ) 10 and HCFO-1233zd (CF 3 CH]CHCl). 11 The environmental impact of HFOs is inextricably linked with the environmental impact of their decomposition products. Triuoroacetic acid (TFA) is highly soluble and removed rapidly from the atmosphere; however, it is persistent in the aquatic environment and has been detected in rivers, oceans, plants that form part of the food chain, and food products.…”

Section: Introductionmentioning

confidence: 99%

Assessing the atmospheric fate of trifluoroacetaldehyde (CF₃CHO) and its potential as a new source of fluoroform (HFC-23) using the AtChem2 box model

Pérez-Peña,

Fisher,

Hansen

et al. 2023

Environ. Sci.: Atmos.

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“…The main atmospheric degradation pathway of HFO-1336mzz(Z) is expected to be initiated by the OH radical. 33,34 Based on the degradation mechanism proposed by Baasandorj et al (2011) 33 and based on studies of similar HFOs, HFO-1336mzz(E), 35 and HCFO-1233zd(E), 36 we expect a molecular yield of nearly 200% trifluoroacetaldehyde (TFAA, CF 3 CHO) as an intermediate product. TFAA is further degraded to different end-products, including trifluoroacetic acid (TFA, CF 3 COOH).…”

Section: ■ Introductionmentioning

confidence: 99%

“…TFAA is further degraded to different end-products, including trifluoroacetic acid (TFA, CF 3 COOH). For HFO-1336mzz(Z), a total molar TFA yield of 4% 36 to less than 20% 37,38 was estimated. Since TFA is mildly phytotoxic and persistent in the environment, its expected increased atmospheric production is raising questions concerning its future impacts on the environment.…”

Section: ■ Introductionmentioning

confidence: 99%

First Atmospheric Measurements and Emission Estimates of HFO-1336mzz(Z)

Rust

Vollmer

Henne

et al. 2023

Environ. Sci. Technol.

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For the past few years, short-lived unsaturated halocarbons have been marketed as environmentally friendly replacements for long-lived halogenated greenhouse gases and ozone-depleting substances. The phase-in of unsaturated halocarbons for various applications, such as refrigeration and foam blowing, can be tracked by their emergence and increase in the atmosphere. We present the first atmospheric measurements of the hydrofluoroolefin (HFO) HFO-1336mzz(Z) ((Z)-1,1,1,4,4,4-hexafluoro-2-butene, cis-CF3CHCHCF3), a newly used unsaturated hydrofluorocarbon. HFO-1336mzz(Z) has been detected in >90% of all measurements since 2018 during multi-month campaigns at three Swiss and one Dutch location. Since 2019, it is found in ∼30% of all measurements that run continuously at the Swiss high-altitude Jungfraujoch station. During pollution events, mole fractions of up to ∼10 ppt were observed. Based on our measurements, Swiss and Dutch emissions were estimated at 2–7 Mg yr–1 (2019–2021) and 30 Mg yr–1 (2022), respectively. Modeled spatial emission distributions only partly conform to population density in both countries. Monitoring the presence of new unsaturated halocarbons in the atmosphere is crucial since long-term effects of their degradation products are still debated. Furthermore, the production of HFOs involves climate-active substances, which may leak to the atmospherein the case of HFO-1336mzz(Z), for example, the ozone-depleting CFC-113a (CF3CCl3).

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A three-dimensional model of the atmospheric chemistry of E and Z-CF3CH=CHCl (HCFO-1233(zd) (E/Z))

Cited by 18 publications

References 37 publications

Projections of National-Gridded Emissions of Hydrofluoroolefins (HFOs) in China

Projections of National-Gridded Emissions of Hydrofluoroolefins (HFOs) in China

Assessing the atmospheric fate of trifluoroacetaldehyde (CF₃CHO) and its potential as a new source of fluoroform (HFC-23) using the AtChem2 box model

First Atmospheric Measurements and Emission Estimates of HFO-1336mzz(Z)

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A three-dimensional model of the atmospheric chemistry of E and Z-CF3CH=CHCl (HCFO-1233(zd) (E/Z))

Cited by 18 publications

References 37 publications

Projections of National-Gridded Emissions of Hydrofluoroolefins (HFOs) in China

Projections of National-Gridded Emissions of Hydrofluoroolefins (HFOs) in China

Assessing the atmospheric fate of trifluoroacetaldehyde (CF3CHO) and its potential as a new source of fluoroform (HFC-23) using the AtChem2 box model

First Atmospheric Measurements and Emission Estimates of HFO-1336mzz(Z)

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Assessing the atmospheric fate of trifluoroacetaldehyde (CF₃CHO) and its potential as a new source of fluoroform (HFC-23) using the AtChem2 box model