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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 .
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
URL: http://dx.doi.org/10.1021/es8004877
DOI: 10.1021/es8004877
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