A range of catalysts consisting of zinc impregnated γ-Al₂O₃ has been examined for the fluorination of chlorofluorocarbons. Addition of zinc to γ-Al₂O₃ promotes steady state fluorination of CF₂ClCFCl₂ (CFC-113) to 1,1,1,2-tetrafluoro-2,2-dichloroethane (CFC-114a). Zinc promotion of fluorination activity was maximised at 6.5 wt%. Temperature programmed reaction (TPR) studies on pre-fluorided catalysts show that CCl₄ is fluorinated by a sequential mechanism, with CCl₃F a primary product and CCl₂F₂ a secondary product. The addition of zinc to γ-Al₂O₃ resulted in a low temperature feature in the TPR profile, and further analysis shows that there is a strong correlation between catalyst activity for CFC-113 fluorination and the concentration of fluorine associated with this low temperature feature. As the site population of the low temperature feature increases the apparent activation energy for the CFC-113 fluorination process decreases. Higher temperature HF pre-treatment resulted in a significant reduction of the population of this low temperature site compared to the standard conditions without pre-treatment, indicating that active fluorine consists of labile surface bonded H-F, rather than a metal fluoride such as AlF₃ or ZnF₂. Based on experiments investigating highly dispersed zinc on an activated carbon support, zinc adjacent to an Al³⁺ ion is required for fluorination, since this allows adsorption of active HF in close proximity to a Lewis acid site, where the CFC can adsorb.

一系列组成的锌浸渍的γ-Al催化剂的₂ ö ₃已审查氯氟烃的氟化。锌的除了在γ-Al ₂ ö ₃促进CF的稳态氟化₂ ClCFCl ₂（CFC-113），以1,1,1,2-四氟-2,2-二氯乙烷（CFC-114a）的。锌对氟化活性的促进在6.5 wt％时达到最大。对预氟化催化剂进行的程序升温反应（TPR）研究表明，CCl ₄是通过顺序机制氟化的，其中CCl ₃ F是主要产物，CCl ₂ F ₂是次要产物。加入锌的至的γ-Al ₂ ö_由图3可知，TPR曲线中存在低温特征，进一步的分析表明，CFC-113氟化反应的催化剂活性与与此低温特征相关的氟浓度之间存在很强的相关性。随着低温特征的位点数量增加，CFC-113氟化过程的表观活化能降低。与未经预处理的标准条件相比，高温HF预处理导致此低温部位的种群显着减少，这表明活性氟由不稳定的表面键合HF组成，而不是由金属氟化物（如AlF ₃或AlF _{3）组成。} ZnF ₂。根据调查在活性炭载体上高度分散的锌的实验，氟化需要与Al ³⁺离子相邻的锌，因为这可以使活性HF吸附在路易斯酸位置附近，在该位置CFC可以吸附。