Journal
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
Volume 10, Issue 6, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2022.108976
Keywords
Greenhouse gas; Trifluoromethane; F/Cl exchange; Aluminum chlorofluoride; Aluminum fluoride
Categories
Funding
- National Key Research and Development Project of China [2019YFC0214504]
- State Key Laboratory of Green Chemistry Synthesis Technology [GCST-20200006]
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CHF3, a super greenhouse gas, can be treated by F/Cl exchange reaction with CHCl3 to form CHCl2F and CHClF2 for resource utilization. The crystal structures of Al-based fluorides play a crucial role in catalytic activity, and AlClxFy species act as the active sites for CHF3 conversion.
CHF3 is considered as one kind of super greenhouse gases with extremely high global warming potential which is the byproduct during the manufacture of HCFC-22 (CHClF2). Treatment CHF3 via F/Cl exchange reaction with CHCl3 forming CHCl2F and CHClF2 is a potential resource utilization route rather than high energy-demanding incineration. The results confirmed that the crystal structures of Al-based fluorides were important to the catalytic activity due to it affects the availabilities of the Lewis acid sites. Through the DFT calculation, it found that AlClxFy species acted as the active sites for the CHF3 conversion could decrease the energy barrier for the cleavage of C-F bonds. Furthermore, XPS analysis depicted that lower binding energy of Al-F was more likely to be partially chlorinated to formation AlClxFy species. Correspondingly,.-AlF3 showed the best catalytic performance for the CHF3 conversion (30%) as well as less coke deposition contributed by the suitable Lewis acidic intensity.
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