Journal article
Some aspects of metal-support strong interactions in Rh/Al2O3 catalyst under oxidising and reducing conditions
Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Krakow, Poland1
Department of Inorganic Chemistry, Fritz Haber Institute of Max Planck Society, Faradayweg 4-6, D-14195 Berlin, Germany2
Regional Laboratory of Physicochemical Analyses and Structural Research, Jagiellonian University, Ingardena 3, 30-060 Krakow, Poland3
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.
| Language: | English |
|---|---|
| Year: | 2005 |
| Pages: | 137-142 |
| ISSN: | 18734448 and 00092614 |
| Types: | Journal article |
| DOI: | 10.1016/j.cplett.2005.09.112 |
