Metal palladium dispersed inside macroporous ion-exchange resins: the issue of the accessibility to gaseous reactants

Commercial macroporous ion-exchange resins (Lewatit SPC 118 and UCP 118) were used to support Pd metal by a two step ion-exchange and reduction procedure. The textural features of the resins were determined by Inverse Steric Exclusion Chromatography (ISEC) measurements. TEM characterization of the o...

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Bibliographic Details
Published in:Journal of molecular catalysis. A, Chemical Chemical, 2000-02, Vol.151 (1), p.283-288
Main Authors: Biffis, A, Landes, H, Jeřábek, K, Corain, B
Format: Article
Language:English
Subjects:
Catalysis
Catalysts: preparations and properties
Chemistry
Exact sciences and technology
General and physical chemistry
Ion exchangers
ISEC
Palladium
Polymer supports
Pulse chemisorption
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:Commercial macroporous ion-exchange resins (Lewatit SPC 118 and UCP 118) were used to support Pd metal by a two step ion-exchange and reduction procedure. The textural features of the resins were determined by Inverse Steric Exclusion Chromatography (ISEC) measurements. TEM characterization of the obtained Pd/resin composite showed the presence of uniformly sized Pd crystallites located at the macropore “surface”. Pulse chemisorption analysis gave evidence for the lack of accessibility of the crystallites when the resin composite is in the dry state. This suggests that the metal particles are in fact embedded in a gel-type resin layer at the “surface” of the macropores and therefore practically unaccessible to the molecules of a gaseous phase unless the support is in the swollen state.
ISSN:1381-1169
1873-314X
DOI:10.1016/S1381-1169(99)00268-X