Hydrogenation of aromatics on modified platinum–alumina catalysts
1998; Elsevier BV; Volume: 170; Issue: 2 Linguagem: Inglês
10.1016/s0926-860x(98)00058-1
ISSN1873-3875
AutoresAbdel-Ghaffar A. Ali, Laila I. Ali, Sameh M. Aboul‐Fotouh, Ahmed K. Aboul‐Gheit,
Tópico(s)Catalysis and Oxidation Reactions
ResumoUsing a pulsed-micro catalytic reactor benzene and toluene were hydrogenated to cyclohexane and methylcyclohexane, respectively, in a temperature range 50–250°C. Modified catalysts containing 0.35% Pt–Al2O3 were investigated. Modification was carried out via (a) introducing a second metal (Ir, Rh, Re and U) and (b) fluorination and chlorination with different halogen contents of 1,3 and 6 wt%. The study revealed that (1) all catalysts show good catalytic activities in the temperature range 125–150°C, except Rh catalyst which is very active even at room temperature, (2) introducing either Ir or Re enhances Pt activity, while U inhibits this activity, (3) halogenation promotes the catalyst activity and (4) alkyl-substitution enhanced aromatic ring hydrogenation.
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