Abstract
The thermal stability of rhodium on ceric oxides submitted to high-temperature reduction (773–1173 K) and aging in air at 1173 K was studied by high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy and benzene hydrogenation. Catalysts were prepared by anionic exchange of rhodium chloro complexes on both high (144 m2 g-1) and low specific surface area ceria (6 m2 g-1). In reducing conditions, both types of catalysts stabilized 5 nm metal rhodium particles. Calcination in air at 1173 K pointed out the interest of rhodium exchanged over a low surface precalcined ceria. In that case, all the metal remained at the surface of CeO2 after calcination whereas 50% of the initial supported metal was buried into sintered ceria for the catalyst prepared from the high-surface CeO2.
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Fajardie, F., Tempere, JF., Manoli, JM. et al. Thermal stability of (0.15–0.35 wt%) rhodium on low-loaded ceria-supported rhodium catalysts. Catalysis Letters 54, 187–193 (1998). https://doi.org/10.1023/A:1019021215129
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DOI: https://doi.org/10.1023/A:1019021215129