Modeling Gold Nanoparticles:  Morphology, Electron Structure, and Catalytic Activity in CO Oxidation<sup>†</sup>

Guczi, L.; Horváth, Dániel; Pászti, Zoltán; Tóth, Lajos; Horváth, Z.E.; Karacs, Albert; Petö, G.

doi:10.1021/jp992662k

Cited by 80 publications

(43 citation statements)

References 39 publications

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“…On the other hand, prereduced samples exhibited a high activity from the reaction onset. However, extensive reduction of catalysts has been shown to be detrimental to their activity in many cases (423,(466)(467)(468).…”

Section: Figure 27mentioning

confidence: 99%

Surface chemistry of catalysis by gold

et al. 2004

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IntroductionGold has long been regarded as an "inert" surface and bulk gold surfaces do not chemisorb many molecules easily. However, in the last decade, largely through the efforts of Masatake Haruta, gold particles, particularly those below 5 nm in size, have begun to garner attention for unique catalytic properties (1-8). In recent years, supported gold particles have been shown to be effective as catalysts for low temperature CO oxidation (9), selective oxidation of propene to propene oxide (10), water gas shift (11), NO reduction (12), selective hydrogenation of acetylene (or butadiene) (13)

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Section: Figure 27mentioning

confidence: 99%

Surface chemistry of catalysis by gold

et al. 2004

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“…However, Tripathy et al [53] studied the CO oxidation using the microcalorimetry technique and concluded that the lattice oxygen of Fe 2 O 3 does play an important role in the reaction. Later, Guczi et al [54] proposed that the high activity of Au-Fe 2 O 3 samples for CO oxidation was due to the high O 2 adsorption over the Fe 2 O 3 , which acted as the oxygen reservoir during the reaction. Okumura and Haruta [9] observed that Au metallic species in Au/ -Fe 2 O 3 catalysts are very active.…”

Section: Catalytic Oxidation Of Carbonmentioning

confidence: 99%

Low Temperature Oxidation of Carbon Monoxide over Mesoporous Au-Fe₂O₃Catalysts

Alshehri

Narasimharao

2017

Journal of Nanomaterials

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Low temperature active and stable mesoporous Au (0.1, 0.2, 0.5, and 1.0 wt.%) supported -Fe 2 O 3 catalysts were prepared via deposition-precipitation method. The H 2 -pretreated catalyst with 0.5 wt.% Au loading offered CO conversion of 100% at 323 K and showed continual activity for at least 120 h. X-ray diffraction and transmission electron microscopy analysis indicate that Au species were highly dispersed as nanoparticles (20-40 nm) on the surface of -Fe 2 O 3 support even after thermal treatment at 773 K. The N 2 -physisorption measurements show that the synthesized -Fe 2 O 3 support and Au-Fe 2 O 3 nanocomposites possessed mesopores with high specific surface area of about 158 m 2 g −1 . X-ray photoelectron spectroscopy and H 2 -TPR results reveal that the Au species exist in metallic and partially oxidized state due to strong interaction with the support. Effective Au-Fe 2 O 3 interaction resulted in a high activity for Au nanoparticles, locally generated by the thermal treatment at 773 K in air.

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“…Some of these papers claim a positive effect of the hydrogen treatment; others report an activity decrease after this treatment [23][24][25].…”

Section: The Influence Of the Mild Reduction Process (150 °C H 2 /Armentioning

confidence: 99%

The Influence of Base Metal (M) Oxidation State in Au-M-O/TiO2 Systems on Their Catalytic Activity in Carbon Monoxide Oxidation

et al. 2011

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Base metal promoted gold/titania catalysts were synthesized, characterized and tested in CO oxidation reaction. Catalysts containing dopant metals in higher oxidation states exhibited higher activity than catalysts containing dopants in reduced states. The activity of fresh catalysts promoted by Cu, Fe and Ni was similar to the unpromoted one, but treatment in reducing and oxidizing atmospheres revealed the supremacy of the copper promoted catalyst. The sequential deposition method proved to be better than the co-deposition-precipitation method. An attempt to explain these differences using XPS, FTIR and H 2 TPR was performed.

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Modeling Gold Nanoparticles: Morphology, Electron Structure, and Catalytic Activity in CO Oxidation^†

Cited by 80 publications

References 39 publications

Surface chemistry of catalysis by gold

Surface chemistry of catalysis by gold

Low Temperature Oxidation of Carbon Monoxide over Mesoporous Au-Fe₂O₃Catalysts

The Influence of Base Metal (M) Oxidation State in Au-M-O/TiO2 Systems on Their Catalytic Activity in Carbon Monoxide Oxidation

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Modeling Gold Nanoparticles: Morphology, Electron Structure, and Catalytic Activity in CO Oxidation†

Cited by 80 publications

References 39 publications

Surface chemistry of catalysis by gold

Surface chemistry of catalysis by gold

Low Temperature Oxidation of Carbon Monoxide over Mesoporous Au-Fe2O3Catalysts

The Influence of Base Metal (M) Oxidation State in Au-M-O/TiO2 Systems on Their Catalytic Activity in Carbon Monoxide Oxidation

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Modeling Gold Nanoparticles: Morphology, Electron Structure, and Catalytic Activity in CO Oxidation^†

Low Temperature Oxidation of Carbon Monoxide over Mesoporous Au-Fe₂O₃Catalysts