Issue 1, 1992

Sulfur poisoning and regeneration of palladium-based catalysts. Part 1.—Dehydrogenation of cyclohexane on Pd/Al2O3 and Pd/SiO2–Al2O3 catalysts

Abstract

The catalytic activity of palladium deposited on alumina and silica–alumina for the dehydrogenation of cyclo-hexane 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 platinum deposited on alumina for cyclohexane aromatization in the absence of any poisoning additive. In 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.

Article information

Article type
Paper

J. Chem. Soc., Faraday Trans., 1992,88, 113-119

Sulfur poisoning and regeneration of palladium-based catalysts. Part 1.—Dehydrogenation of cyclohexane on Pd/Al2O3 and Pd/SiO2–Al2O3 catalysts

L. J. Hoyos, M. Primet and H. Praliaud, J. Chem. Soc., Faraday Trans., 1992, 88, 113 DOI: 10.1039/FT9928800113

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