Dehydrogenation of cyclohexane on catalysts containing noble metals and their combinations with platinum on alumina support
Laila I. Ali; Abdel-Ghaffar A. Ali; S.M. Aboul-Fotouh; Ahmed K. Aboul-Gheit;
Abstract
The dehydrogenation of cyclohexane over catalysts containing 0.35 wt% of each of the following metals: Pt, Rh, Re, U, PtIr, PtRh, PtRe and PtU on g-Al2O3 was carried out in a pulsed micro-reactor system at the temperature range 200±5008C. PtRh catalyst was the most active for the dehydrogenation of cyclohexane in the temperature range 250±3508C. The catalyst containing Rh was the most active for hydrogenolysis of cyclohexane to propane due to the higher percentage of d-bond character of Rh. It was found that the introduction of U inhibits the activity of Pt catalyst for the dehydrogenation. The effect of chlorine and fuorine contents (1, 3 and 6 wt%) on the activities of these catalysts were investigated. Optimum halogen content was found to be 3% for dehydrogenation enhancement which may be attributed to improved hydrogen spillover as well as to increased dispersion of the metal in the support. The catalysts containing Ir (3.0% F) and PtU (3.0% F) exhibit some hydroisomerization activity to methylcyclopentane. However, inclusion of chlorine reduces the activity of PtIr whereas both chlorine and fuorine reduce the activity of PtRh-containing catalysts.
Other data
Title | Dehydrogenation of cyclohexane on catalysts containing noble metals and their combinations with platinum on alumina support | Authors | Laila I. Ali ; Abdel-Ghaffar A. Ali; S.M. Aboul-Fotouh; Ahmed K. Aboul-Gheit | Keywords | Cyclohexane; Dehydrogenation; Noble metals/Al2O3; Halogen promotion | Issue Date | 1999 | Publisher | Elsevier Science B.V. | Journal | Applied Catalysis A: general | Volume | 177 | Start page | 99 | End page | 110 |
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