Vapour-phase hydrodehalogenation of chlorobenzene over platinum/H-BEA zeolite Original Research Article

Platinum/H-BEA zeolite and Pt/Al2O3 were studied as catalysts in the vapour-phase hydrodehalogenation of chlorobenzene. Both catalysts show high activity in the hydrogenolysis of the carbonhalogen bond. Deactivation of platinum/H-BEA is ascribed to acid catalyzed oligomerization reactions and coke formation. This is supported by quantitative DSC analyses and by extraction/GC-MS experiments. Replacement of Brønsted acid sites in platinum/H-BEA by sodium ions results in a diminished coke formation and an improved stability.