Study on lead additives in modified palladium catalysts

The characterization of palladium-lead on calcium carbonate catalysts has been carried out. Although widely utilized in laboratory and industrial syntheses, as e.g. the Lindlar catalyst, they are not sufficiently understood. Hydrogen sorption studies by catalysts of this type, their X-ray and XPS ch...

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Bibliographic Details
Published in:Journal of molecular catalysis 1984-01, Vol.25 (1), p.307-316
Main Authors: Palczewska, W., Jabłonski, A., Kaszkur, Z., Zuba, G., Wernisch, J.
Format: Article
Language:English
Subjects:
Catalysis
Catalysts: preparations and properties
Catalytic reactions
Chemistry
Exact sciences and technology
General and physical chemistry
General. Nomenclature, chemical documentation, computer chemistry
Theory of reactions, general kinetics
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:The characterization of palladium-lead on calcium carbonate catalysts has been carried out. Although widely utilized in laboratory and industrial syntheses, as e.g. the Lindlar catalyst, they are not sufficiently understood. Hydrogen sorption studies by catalysts of this type, their X-ray and XPS characteristics, and the results of kinetic tests as catalysts in the semihydrogenation of acetylene indicated the nature of the metallic component of the Lindlar catalyst as palladium crystallites partially covered with a dispersed lead oxide deposit. The second catalyst characterized was a Pd-Pb alloy supported on CaCO 3 system, and was identified as a Pd 3Pb intermetallic compound. Its selectivity, higher than that of the commercial Lindlar catalyst, was attributed to the ordered structure of the Pd-Pb alloy.
ISSN:0304-5102
DOI:10.1016/0304-5102(84)80053-X