Some aspects of metal-support strong interactions in Rh/Al2O3 catalyst under oxidising and reducing conditions

M. Zimowska, Jakob Birkedal Wagner, J. Dziedzic, J. Camra, B. Borzęcka-Prokop, M. Najbar

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The aim of the Letter is to elucidate the nature of metal-support interaction in the 2wt% Rh/Al2O3 catalyst obtained by annealing Rh–O–Al xerogel at 1113K in air.XPS, HRTEM, and XRD results reveal that during the Rh–O–Al xerogel annealing in air, rhodium incorporates into forming alumina, which results mostly in Rh4+/δ-Al2O3 solid solution formation. However, in the course of the catalyst reduction at 773 with H2 and at 823K with CH4 the Rh4+/δ-Al2O3 solid solution transforms into Rh–Al alloy. The islands of rhodium form on the surface of the Rh–Al alloy nanocrystallites if the reduction is slow enough.
Original languageEnglish
JournalChemical Physics Letters
Volume417
Issue number1-3
Pages (from-to)137-142
Number of pages6
ISSN0009-2614
DOIs
Publication statusPublished - 2006
Externally publishedYes

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