2001
DOI: 10.1039/b100690h
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An amorphous approach to the structure of a Pt–Fe/γ-Al2O3 catalyst characterized by XAFS

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Cited by 15 publications
(9 citation statements)
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“…3, the Rh particle was directly fastened to SiO 2 by interaction of Rh and SiO 2 (Rh O bonds) after calcination and most Rh species at the outer layer of Rh nano-particle were reduced to Rh 0 species. After they had been chemically adsorbed by PPh 3 , these Rh 0 species at the surface were oxidized to Rh δ+ (0 < δ < 1) species by syngas and bound to the Rh 0 layer in the bulk of metallic nanoparticles, and all these exterior Rh species were tightly bound by the very strong metal-metal bonds [31]. When the coordination bonds between Rh δ+ and ligands are broken during catalytic reactions, Rh species is fixed on SiO 2 by the Rh O bonds and the very strong metal-metal bonds and PPh 3 is inevitably leached in the case of PPh 3 -Rh/SiO 2 , however, the Rh ion may break away from the support in a homogeneous catalyst heterogenized on a solid support [21].…”
Section: Resultsmentioning
confidence: 99%
“…3, the Rh particle was directly fastened to SiO 2 by interaction of Rh and SiO 2 (Rh O bonds) after calcination and most Rh species at the outer layer of Rh nano-particle were reduced to Rh 0 species. After they had been chemically adsorbed by PPh 3 , these Rh 0 species at the surface were oxidized to Rh δ+ (0 < δ < 1) species by syngas and bound to the Rh 0 layer in the bulk of metallic nanoparticles, and all these exterior Rh species were tightly bound by the very strong metal-metal bonds [31]. When the coordination bonds between Rh δ+ and ligands are broken during catalytic reactions, Rh species is fixed on SiO 2 by the Rh O bonds and the very strong metal-metal bonds and PPh 3 is inevitably leached in the case of PPh 3 -Rh/SiO 2 , however, the Rh ion may break away from the support in a homogeneous catalyst heterogenized on a solid support [21].…”
Section: Resultsmentioning
confidence: 99%
“…An EXAFS study [10] reported that the dispersion of Pt on Al 2 O 3 is markedly improved by adding small amount of Fe (Fe/Pt = 5), and the EXAFS data suggested that the Fe is at the interface of Pt and Al 2 O 3 . Therefore, we studied the effect of small amount of FeO x on the activity of a Pt/Al 2 O 3 catalyst.…”
Section: Reaction On (A) Feo X /Pt/almentioning
confidence: 96%
“…Fe/ZSM-5 [1,[25][26][27][28][29], Fe/MCM-41 [30] and Fe/Al 2 O 3 [31,32], is often modelled by using bulk oxides such as α-Fe 2 O 3 neglecting the interaction of Fe with the support. As a consequence, large and strongly varying correction terms (such as the ΔE 0 ) are required to obtain a statistically reliable EXAFS fit.…”
Section: Introductionmentioning
confidence: 99%