A novel method for the synthesis of well-crystallized β-AlF3 with high surface area derived from γ-Al2O3

Abstract

Well-crystallized β-AlF₃ with high surface area was synthesized by a carbon template method. Porous γ-Al₂O₃ was filled with carbon and transformed into AlF₃ by fluorination. After removing the carbon template by thermal combustion, the resulting β-AlF₃ had a surface area of 114 m² g⁻¹. Temperatures for fluorination and thermal combustion were crucial for the phase composition of the resulting sample. The high surface area β-AlF₃ was very active for dismutation of CF₂Cl₂ due to its large amount of surface acid sites.