Supported palladium (Pd) catalysts are among the most intensively studied catalyst systems for their application to many industrial processes.[1] For a full understanding of the catalytic performance of these systems, it is desirable to know the morphology, distribution, size and oxidation state of the Pd species and perhaps most importantly, whether or not any metal-support interaction (MSI) exists. Although significant research efforts have been devoted to the study of the Pd-alumina system, a full understanding of the MSI has not yet been reached. Early studies indicated g-Al 2 O 3 to be inert with Pd/g-Al 2 O 3 catalysts showing either no MSI or only a weak MSI.[2] Recent experiments, however, have shown that there exists an appreciable degree of interaction between Pd and g-Al 2 O 3 ,[3,4] which is either attributed to the formation of Pd-Al alloys or to the charge transfer between Pd and alumina.
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