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Conversion of CHF3 to CH2 = CF2 via reaction with CH4 and CaBr2

Lookup NU author(s): Hongdong Yu


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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 inthe observed enhanced yield of CH2=CF2 .

Publication metadata

Author(s): Han WF, Yu H, Kennedy EM, Mackie JC, Dlugogorski BZ

Publication type: Article

Publication status: Published

Journal: Environmental Science and Technology

Year: 2008

Volume: 42

Issue: 15

Pages: 5795-5799

ISSN (print): 0013-936X

ISSN (electronic): 1520-5851

Publisher: American Chemical Society


DOI: 10.1021/es8004877


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