Results 31 to 40 of about 2,055 (180)

Activation of pentafluoropropane isomers at a nanoscopic aluminum chlorofluoride: hydrodefluorination versus dehydrofluorination

Beilstein Journal of Organic Chemistry, 2020
The hydrofluorocarbon 245 isomers, 1,1,1,3,3-pentafluoropropane, 1,1,1,2,2- pentafluoropropane, and 1,1,1,2,3-pentafluoropropane (HFC-245fa, HFC-245cb, and HFC-245eb) were activated through C–F bond activations using aluminium chlorofluoride (ACF) as a ...
Maëva-Charlotte Kervarec, Thomas Braun, Mike Ahrens, Erhard Kemnitz   +3 more
doaj   +1 more source

Increase in global emissions of HFC-23 despite near-total expected reductions

Nature Communications, 2020
International agreements have been implemented to reduce emissions of hydrofluorocarbons (HFCs) to reduce their radiative forcing. Even though reported HFC-23 emissions are at a historical low, observations indicate that emissions have actually increased
K. M. Stanley, D. Say, J. Mühle, C. M. Harth, P. B. Krummel, D. Young, S. J. O’Doherty, P. K. Salameh, P. G. Simmonds, R. F. Weiss, R. G. Prinn, P. J. Fraser, M. Rigby   +12 more
doaj   +1 more source

Performance modelling and greenhouse impact assessment of a micro-ORC energy system working with HFCs, low GWP fluids and mixtures [PDF]

E3S Web of Conferences, 2021
The worrying effects of climate change have led, in the last decades, to the improvement of innovative solutions for low greenhouse emission energy conversion, among which, is the use of micro-ORC (Organic Rankine Cycle) systems for distributed ...
Bianchi Michele, Branchini Lisa, De Pascale Andrea, Melino Francesco, Ottaviano Saverio, Peretto Antonio, Torricelli Noemi   +6 more
doaj   +1 more source

Unfinished business after five decades of ozone-layer science and policy

Nature Communications, 2020
The Montreal Protocol has begun to heal the Antarctic ozone hole and avoided more global warming than any other treaty. Still, recent research shows that new unexpected emissions of several chlorofluorocarbons, carbon tetrachloride, and ...
Susan Solomon, Joseph Alcamo, A. R. Ravishankara   +2 more
doaj   +1 more source

Hydrofluorocarbons and stratospheric ozone

, 1995
Recognition of the adverse environmental impact of chlorofluorocarbons (CFCs)1 has led to an international agreement to cease their production. Hydrofluorocarbons (HFCs) are important CFC substitutes.
Schneider, W.F., Wallington, T.J., Wallington, Timothy J., Sehested, Jens, Sehested, J., Schneider, William F., Nielsen, Ole John, Nielsen, O.J.   +7 more
core   +1 more source

Gold Clusters With Open‐Shell Ligands: Superatom Mediated Magnetic Interaction

Angewandte Chemie, EarlyView.
Open‐shell verdazyl radicals were covalently integrated with atomically precise Ir‐doped Au12 (Ir@Au12) superatoms. The resulting radical–superatom hybrids exhibit photoinduced electron transfer, spin delocalization onto the metal‐cluster core, and weak ferromagnetic communication between radicals mediated by the superatomic electronic structure ...
Katsuya Mutoh, Kosei Hayashi, Yoichi Kobayashi, Kazunobu Sato, Rika Tanaka, Daichi Kitagawa, Tatsuya Tsukuda, Takuya Nakashima   +7 more
wiley   +2 more sources

More to offer from the Montreal protocol: how the ozone treaty can secure further significant greenhouse gas emission reductions in the future

Journal of Integrative Environmental Sciences
Action under the Montreal Protocol has contributed to climate change mitigation for almost 35 years. The phase-out of ozone-depleting substances (ODS) has set the ozone layer on a path to recovery, protecting the world’s biosphere from harmful ...
Clare Perry, Thomas Nickson, Christina Starr, Tim Grabiel, Sophie Geoghegan, Beth Porter, Avipsa Mahapatra, Fionnuala Walravens   +7 more
doaj   +1 more source

Solubility of hydrofluorocarbons in aromatic solvents and alcohols: Experimental data and modeling with CPA EoS

, 2013
New experimental data of gas solubility of hydrofluorocarbons (CH3F, CH2F2, CHF3 and CF4) in aromatic solvents (benzene, toluene, m-xylene, mesitylene) have been determined.
José M. M. V. Sousa, I. M. A. Fonseca, A. J. Queimada, E. A. Macedo   +3 more
core   +1 more source

Development and Application of a Cost–Effective Analytical Method for Hydrofluorocarbons Using Preconcentrator–Gas Chromatograph–Mass Spectrometer

Atmosphere
The expansion of atmospheric observation networks for hydrofluorocarbons (HFCs), which are closely related to climate change and contribute to global warming, significantly impacts our society and daily life.
Yujiro Ichikawa, Yukiko Ono, Kouki Sasaka   +2 more
doaj   +1 more source

Lipase-catalysed kinetic resolutions of secondary alcohols in pressurised liquid hydrofluorocarbons

, 2009
Three model secondary alcohols have been subjected to enzymatic kinetic resolution using three common lipases and a typical acyl donor. The resolutions were performed in two pressurised low-boiling hydrofluorocarbons, which are novel media for enzymatic ...
Corr, Stuart, Micklefield, Jason, Ball, Anthony J.   +2 more
core   +1 more source