Abstract
A novel approach to the preparation of a porous chromium fluoride catalyst with a large surface area is reported. The pores were generated by introduction of a siliceous material into the precursor of the catalyst and then removal of the material by reaction with anhydrous hydrogen fluoride. During the reaction, the formation and escape of a volatile gas (SiF4) from the precursor enlarged the surface area of the chromium fluoride. This process provided for the first time a porous chromium fluoride with a surface area of 187 m 2/g and a pore volume of 0.58 cm3/g. Furthermore, the porous chromium fluoride exhibited excellent chemical stability in the presence of HCl, HF, and F2. It was catalytically active for halogen exchange in a fixed-bed fluorination reaction, and it exhibited excellent catalytic performance in mitigating the coke formation on the surface of the catalyst during vapor-phase catalytic fluorination.
Original language | English |
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Pages (from-to) | 254-257 |
Number of pages | 4 |
Journal | Journal of Catalysis |
Volume | 231 |
Issue number | 1 |
DOIs | |
Publication status | Published - 1 Apr 2005 |
Externally published | Yes |
Keywords
- Anhydrous hydrogen fluoride (AHF)
- Difluoromethane (HFC-32)
- Organo-fluorine compounds
- Porous chromium fluoride
- Porous metal fluorides
- Vapor-phase catalytic fluorination