Treatment of the potent greenhouse gas, CHF3—An overview

Han, Wenfeng; Liu, Ying; Tang, Haodong; Liu, Huazhang

doi:10.1016/j.jfluchem.2012.04.012

Cited by 84 publications

(82 citation statements)

References 68 publications

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“…The simplest modification of the C-F bond is its transformation to the simple C-H bond (hydrodefluorination, HDF), a process that has been mainly limited to fluoroarenes, with very few examples referring to trifluoromethylarenes and other perfluoroalkyl groups 1,[22][23][24][25][26] . HDF is an interesting process not only because of the fundamental importance on the C-F bond activation chemistry involved but also because of the potential applications in the activation and disposal of the chlorofluorocarbons, considered as 'super greenhouse gases' [27][28][29][30][31] . Metal hydrido complexes are often chosen for HDF, but C-F activation can produce stable fluoride complexes, which may hamper catalytic turnover 4,15 .…”

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confidence: 99%

Hydrodefluorination of carbon–fluorine bonds by the synergistic action of a ruthenium–palladium catalyst

2013

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Catalytic hydrodefluorination of organic molecules is a major organometallic challenge, owing to the strength of C-F sigma bonds, and it is a process with multiple industrial applications. Here we report a new heterodimetallic ruthenium-palladium complex based on a triazolyldi-ylidene ligand. The complex is remarkably active in the hydrodefluorination of aromatic and aliphatic carbon-fluorine bonds under mild reaction conditions. We observe that both metals are required to promote the reaction process. The overall process implies that the palladium fragment facilitates the C-F activation, whereas the ruthenium centre allows the reduction of the substrate via transfer hydrogenation from isopropanol/sodium t-butoxide. The activity of this heterodimetallic complex is higher than that shown by a mixture of the related homodimetallic complexes of ruthenium and palladium, demonstrating the catalytic benefits of the heterodimetallic complex linked by a single-frame ligand.

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confidence: 99%

Hydrodefluorination of carbon–fluorine bonds by the synergistic action of a ruthenium–palladium catalyst

2013

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“…yr -1 ) for the 1990s [1]. However, it is reported that CHF 3 has a large global warming potential (GWP), roughly 11,700 times (for a 100-year time horizon) that of CO 2 , and with an atmospheric lifetime of 264 years [2]. Its emission is now being regulated by the Kyoto Protocol [3].…”

Section: Introductionmentioning

confidence: 99%

“…At present, CHF 3 is incinerated at 1473 K in the presence of steam, O 2 and natural gas as reactants. Managed by UNFCCC (United Nations Framework Convention on Climate Change), around 20 projects have been registered under the clean development mechanism (CDM), which will reduce net CO 2 equivalent by about 82.6 million tonnes of CO 2 via HFCs abatement, mainly HFC-23 [2]. Another commercially available technology is the so-called PLASCON process developed by the Australian Commonwealth Scientific and Research Organization (CSIRO) and SRL Plasma Ltd. operating in Mexico and USA for CHF 3 destruction [4].…”

Section: Introductionmentioning

confidence: 99%

Pyrolysis of Trifluoromethane over Activated Carbon: Role of the Surface Oxygen Groups

Han

Jin

Chen

et al. 2014

Progress in Reaction Kinetics and Mechanism

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The pyrolysis of CHF 3 and CHClF 2 over activated carbons was investigated at 823 K, GHSV of 1820 h -1 and pressure of 1 bar. To elucidate the mechanism, activated carbons were treated in H 2 at 1123 K, HNO 3 solution at 363 K, N 2 at 873 K or supported with 4 wt% poly(acrylic acid sodium salt), respectively. The results confirm that following different treatments, the concentration of surface oxygen groups on activated carbons varies dramatically. These surface groups play important roles in the decomposition of CHF 3 and the product profiles. It is suggested that carboxylic groups are responsible for the formation of CF 3 and ultimately the product C 2 F 6 which results from the coupling of CF 3 , while the interaction between CHF 3 and hydroxyl or lactonic groups leads to the total destruction of CHF 3 and production of CO and CO 2 . Pyrolysis of CHClF 2 over activated carbon confirms that surface oxygen groups have no noticeable influence on the reactions of CF 2 . By contrast, a pure carbon surface is responsible for the disproportionation of CF 2 and formation of CF 3 .

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“…[1] Theu tilization of fluoroform as af eedstock for the preparation of valuable fluorinated compounds is ac learly preferred alternative to the destruction of fluoroform. [1] Theu tilization of fluoroform as af eedstock for the preparation of valuable fluorinated compounds is ac learly preferred alternative to the destruction of fluoroform.…”

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confidence: 99%

Argentination of Fluoroform: Preparation of a Stable AgCF₃ Solution with Diverse Reactivities

Xiang

Ouyang

et al. 2019

Angewandte Chemie

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The transformation of alarge-volume industrial byproduct and stable greenhouse gas fluoroform (HCF 3 )t o useful products has recently received significant attention. Now,asimple and scalable preparation of AgCF 3 by treatment of HCF 3 with t-BuOK and AgOAc is disclosed. The reactivity of the HCF 3 -derived AgCF 3 has been demonstrated by hydrotrifluoromethylation of alkenes and C À Htrifluoromethylation of (hetero)arenes.T his work not only provides an ew avenue for the utilization of HCF 3 ,b ut also presents ar eliable and easy-to-execute synthesis of the relatively stable AgCF 3 solution.Scheme 1. Use of HCF 3 in trifluoromethylation reactions.Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

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Treatment of the potent greenhouse gas, CHF3—An overview

Cited by 84 publications

References 68 publications

Hydrodefluorination of carbon–fluorine bonds by the synergistic action of a ruthenium–palladium catalyst

Hydrodefluorination of carbon–fluorine bonds by the synergistic action of a ruthenium–palladium catalyst

Pyrolysis of Trifluoromethane over Activated Carbon: Role of the Surface Oxygen Groups

Argentination of Fluoroform: Preparation of a Stable AgCF₃ Solution with Diverse Reactivities

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Treatment of the potent greenhouse gas, CHF3—An overview

Cited by 84 publications

References 68 publications

Hydrodefluorination of carbon–fluorine bonds by the synergistic action of a ruthenium–palladium catalyst

Hydrodefluorination of carbon–fluorine bonds by the synergistic action of a ruthenium–palladium catalyst

Pyrolysis of Trifluoromethane over Activated Carbon: Role of the Surface Oxygen Groups

Argentination of Fluoroform: Preparation of a Stable AgCF3 Solution with Diverse Reactivities

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Argentination of Fluoroform: Preparation of a Stable AgCF₃ Solution with Diverse Reactivities