Journal of the Chemical Society - Faraday Transactions p. 113 - 120 (1992)
Update date:2022-08-11
Topics:
Hoyos, Luis Javier
Primet, Michel
Prallaud, Helene
The catalytic activity of palladium deposited on alumina and silica-alumina for the dehydrrogenation of cyclohexane was studied.The introduction of sulfur-containing compounds, thiophene or hydrogen sulfide into the feed, was investigated.The Pd/Al2O3 catalyst was less active than deposited on alumina for cyclohexane aromatization in the absence of any poisoning addition, the thio-tolerance is smaller for palladium than for platinum.The decontamination by the sulfur-free feed was also less efficient in the case of alumina supported palladium.However, regeneration under pure hydrogen was more effective for the Pd/Al2O3 sample than for the Pt/Al2O3 one.When palladium was supported on silica-alumina instead of alumina, the deactivation by coking was more intense for sulfur-free reactants.Nevertheless the thio-tolerance was strongly improved in comparison with the Pd/Al2O3 catalyst.In contrast to iridium and platinum supported on silica-alumina, previously studied under similar conditions in the literature, the removal of thiophene or hydrogen sulfide from the feed allowed a total recovery of the catalytic activity of the Pd/SiO2-Al2O3 sample.The sample regeneration was observed after treatment under flowing hydrogen.Such behaviour is discussed in terms of changes of coke precursor reactivity in the presence of adsorbed sulfur.
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