Catalytic fluorination of trichloroethene by anhydrous hydrogen fluoride in the presence of fluorinated chromia under static conditions. Synthesis of [18F]-labelled CF3CH2F and [36Cl]-labelled CF3CH2Cl. Catalytic dehydrofluorination of CF3CH2F and CF3CH2Cl

Investigation of fluorinated surfaces by means of radio-labelled probe molecules

“…An aqueous solution of 18 F À is transported to Glasgow and converted as previously described to solid Cs 18 F (typically 50-450 MBq) [11]. Although the closest medical cyclotron to Glasgow is the John Mallard Scottish PET Centre, Aberdeen, the time loss as a result of the 3 h road journey to Glasgow is offset by the higher specific activities Cs 18 [3,[11][12][13][14][15][16]. These exchange reactions have the advantage of occurring relatively quickly at moderate temperatures (typically temperatures in the range 323-373 K are used) but, because normally all F atoms are exchangeable, the radio-label is distributed statistically throughout and, as a result, specific activities may be relatively low.…”

Manufacture of hydrofluorocarbons and hydrofluoroolefins as the CFCs-alternatives: from fundamental of catalytic reaction to commercialization

“…SiO2+HF→SiF4↑+H2O (20) 氟化铝具有α、β、γ等晶体结构, 其中β、γ-AlF3 的表面不饱和Al原子多、酸性强, 适用于气相氟化反 应 [14,15,29] . 但是β、γ-AlF3单独用作催化剂时活性较差, 负载Cr 3+ 后其氟化反应活性大幅提升.…”

Investigating acidity of metal fluoride surfaces by spectroscopic and chemical methods

“…The halogen exchange model developed for C 2 CFCs appears, after the initial hydrofluorination of CHCl5 5CCl 2 to give CH 2 ClCCl 2 F, to be applicable here; unwanted dehydrofluorination processes that lead to toxic, olefinic side products can be inhibited by maintaining a good concentration of adsorbed HF at the surface [26,27]. The alternative pathway of dehydrochlorination or dehydrofluorination followed by hydrofluorination of the olefin formed can be promoted by using a chromia prefluorinated by an HFC.…”