Catalytic reaction of methane with CBrF3

Li, Kai; Kennedy, Eric M.; Dlugogorski, Bogdan Z.; Howe, Russell F.

doi:10.1039/a900972h

Cited by 14 publications

(11 citation statements)

References 13 publications

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“…Furthermore, Li et al 5,6,14 15 Among a number of minor products, CH 3 Br was first detected approximately at a temperature of 525 °C and a residence time of 4 s. With increasing temperature and residence time, the amount of CH 3 Br formed increased slightly.…”

Section: Resultsmentioning

confidence: 98%

Gas-Phase Reaction of Halon 1301 (CBrF₃) with Propane

Kennedy

Dlugogorski

2002

Ind. Eng. Chem. Res.

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The nonoxidative gas-phase reaction of Halon 1301 (CBrF3) with propane in a nitrogen bath was investigated using a tubular plug-flow reactor. Experiments were performed at atmospheric pressure, over a range of temperatures from 500 to 700 °C, and at residence times between 0.7 and 4 s. The pyrolysis of propane was also investigated to examine the effect of added Halon 1301 on the pyrolysis reaction. Experimental data suggest that CF3 and possibly Br radicals formed via the thermal cleavage of CBrF3 react with C3H8 and, at higher temperatures, with the decomposition products of C3H8. In addition to HBr, the major products formed during the reaction included CHF3, CH4, C2H4, C3H6, and H2. Minor product species including C2H2, C2H6, C3H4, HF, C2H3F3, C2H2F2, C3H3F3, and C2H3F were detected. Coke formation was also observed on the surface of the reactor.

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Section: Resultsmentioning

confidence: 98%

Gas-Phase Reaction of Halon 1301 (CBrF₃) with Propane

Kennedy

Dlugogorski

2002

Ind. Eng. Chem. Res.

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“…We have previously studied the reaction of CBrF3 with CH4 in the gas phase and over transition metal exchanged ZSM-5 catalysts (20,21). CBrF3 has a relatively weak C-Br bond and can produce Br and CF3 at relatively low temperatures.…”

Section: Figure 2 Results Of Transient Study Of Ch4 In the Absence Amentioning

confidence: 99%

Conversion of CHF₃ to CH₂═CF₂ via Reaction with CH₄ and CaBr₂

Han

Kennedy

et al. 2008

Environ. Sci. Technol.

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Reaction of CHF3 and CH4 over CaBr2 was investigated at 400-900 degrees C as a potential route for transforming the highly potent greenhouse gas, CHF3, into the valuable product CH2=CF2. The homogeneous reaction of CHF3 with CH4 was also studied to assist in understanding the chemistries involved. Compared to the gas phase reaction, the addition of CaBr2 as a reactant increases the conversion of CHF3 and CH4 significantly at low temperatures while to a lesser extent at higher temperatures. In the absence of CaBr2, besides the target product, CH2=CF2, a large amount of C2F4 forms. On addition of CaBr2, the rate of formation of C2F4 drops dramatically to near zero, while the rate of formation of CH2=CF2 increases considerably at temperatures below 880 degrees C. Experimental and theoretical studies suggest that CHF3 strongly interacts with CaBr2, resulting in the fluorination of CaBr2 to CaF2, the release of active Br species results in the selective formation of CBrF3. The subsequent reactions involving Br, methane, and CBrF3 play a major role in the observed enhanced yield of CH2=CF2.

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“…In the gas phase above 973 K a stoichiometric 1 : 1 reaction occurs between CF 3 Br and CH 4 in which hydrogen and bromine are exchanged [18]: Alternative sources of hydrogen may also be contemplated for gas-phase hydrodehalogenation reactions.…”

Section: Hydrodehalogenationmentioning

confidence: 99%

Catalytic Dehalogenation

Howe

2008

Handbook of Heterogeneous Catalysis

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The sections in this article are Introduction Organohalogen Compounds Reaction Types Decomposition Hydrodehalogenation Oxidation Hydrolysis Supported Metal Catalysts Zeolite Catalysts

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Catalytic reaction of methane with CBrF3

Cited by 14 publications

References 13 publications

Gas-Phase Reaction of Halon 1301 (CBrF₃) with Propane

Gas-Phase Reaction of Halon 1301 (CBrF₃) with Propane

Conversion of CHF₃ to CH₂═CF₂ via Reaction with CH₄ and CaBr₂

Catalytic Dehalogenation

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Catalytic reaction of methane with CBrF3

Cited by 14 publications

References 13 publications

Gas-Phase Reaction of Halon 1301 (CBrF3) with Propane

Gas-Phase Reaction of Halon 1301 (CBrF3) with Propane

Conversion of CHF3 to CH2═CF2 via Reaction with CH4 and CaBr2

Catalytic Dehalogenation

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Resources

About

Gas-Phase Reaction of Halon 1301 (CBrF₃) with Propane

Gas-Phase Reaction of Halon 1301 (CBrF₃) with Propane

Conversion of CHF₃ to CH₂═CF₂ via Reaction with CH₄ and CaBr₂