Popis: |
The irreversible adsorption of boron trifluoride on calcined γ-alumina and amorphous chromia, in both cases at room temperature, has been studied using [ 18 F]-labelled BF 3 . Although the resulting γ-alumina surface has some catalytic activity for the room temperature fluorination by anhydrous HF of CH 3 CCl 3 under static conditions, its activity is far lower than that of γ-alumina, which has been fluorinated with SF 4 , nominally at room temperature. A possible explanation for the observed behaviour is given. |