Ultrastable Gold Nanocatalyst Supported by Nanosized Non-Oxide Substrate

Yan, Wenfu; Brown, Suree; Pan, Zhengwei; Mahurin, Shannon M.; Overbury, Steven H.; Dai, Sheng

doi:10.1002/anie.200503808

Cited by 104 publications

(79 citation statements)

References 60 publications

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“…Furthermore, the activities of a Au/TiO 2 , Au/Al 2 O 3 , Au/ZnO, and Au/ZrO 2 , catalysts do not follow the trend expected from the reducibility of the support [35,118,122]. A recent report of an active and stable LaPO 4 ) supported Au catalyst proves that non-oxidic supports can also be used [123], which further supports the idea that support-mediated oxygen transport does not necessarily contribute to the CO oxidation activity of Au catalysts.…”

Section: Influence Of the Supportmentioning

confidence: 94%

Insights into the reactivity of supported Au nanoparticles: combining theory and experiments

et al. 2007

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The origin of the extraordinary catalytic activity of gold nanoparticles is discussed on the basis of density-functional calculations, adsorption studies on single crystal surfaces, and activity measurements on well characterized supported gold particles. A number of factors are identified contributing to the activity, and it is suggested that it is useful to consider lowcoordinated Au atoms as the active sites, for example, CO oxidation and that the effect of the support can be viewed as structural and electronic promotion. We identify the adsorption energy of oxygen and the Au-support interface energy as important parameters determining the catalytic activity.

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Section: Influence Of the Supportmentioning

confidence: 94%

Insights into the reactivity of supported Au nanoparticles: combining theory and experiments

et al. 2007

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“…171,172 HAP was selected as a support for AuCLs 173175 since it was expected to adsorb Au n (SG) m as efficiently as other biomolecules via hydrogen bonding and/or the electrostatic interaction 176 and that HAP could stabilize bare Au n clusters against sintering due to its strong interaction with the PO 4 3¹ moiety. 177 First, Au n (SG) m clusters with (n, m) = (10, 10), (18,14), (25,18), and (39,24) were prepared by the method described in Section 2.1 and were adsorbed on HAP (surface area: µ100 m 2 g…”

Section: Catalysis Formentioning

confidence: 99%

Toward an Atomic-Level Understanding of Size-Specific Properties of Protected and Stabilized Gold Clusters

Tsukuda

2012

Bulletin of the Chemical Society of Japan

232

230

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Metal clusters consisting of fewer than 100 atoms (diameter <2 nm) are highly promising as a new class of building units for functional materials because of their novel and size-dependent properties. Nevertheless, basic and applied studies of metals clusters have been hampered by the lack of specific guidelines for design and precise synthetic methods. This account surveys recent investigations of gold clusters focusing on our effort toward an atomic-level understanding and control of their size-specific properties. We have developed a size-controlled method for synthesizing gold clusters protected by ligands, stabilized by polymers, and supported on solids. Remarkable size-effects on stabilities and various properties including catalysis were observed. Their mechanisms are discussed based on fundamental knowledge of bare gold clusters in the gas phase.

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“…This carboxylate binds with a superoxide and forms CO 2 [61]. As more evidence keeps accumulating on the high CO oxidation activity of gold nanoparticles on any oxide support, including a recent study on SiO 2 [62] and even on non-oxide supports [16], the mechanistic options appear to zero in to highly defective gold clusters independent of the support. [22,23].…”

Section: Co Oxidation On Au/fe 2 Omentioning

confidence: 99%

“…Perhaps the most intensively studied reaction to date is the CO oxidation on gold supported on oxides, such as iron oxide and titania [1,[4][5][6][7], and ceria [8][9][10][11], but also on non-reducible oxides, such as alumina [12][13][14][15] and silica [12]. Activity of nanoparticles of gold on non-oxide supports has also been reported [16]. The preferential oxidation of CO (PROX) has been reported to take place on nanoscale gold on oxide supports with high selectivity at temperatures below 120°C even in realistic fuel gas mixtures [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Comparison of the activity of Au/CeO2 and Au/Fe2O3 catalysts for the CO oxidation and the water-gas shift reactions

et al. 2007

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We compare the activity and relevant gold species of nanostructured gold-cerium oxide and gold-iron oxide catalysts for the CO oxidation by dioxygen and water. Well dispersed gold nanoparticles in reduced form provide the active sites for the CO oxidation reaction on both oxide supports. On the other hand, oxidized gold species, strongly bound on the support catalyze the water-gas shift reaction. Gold species weakly bound to ceria (doped with lanthana) or iron oxide can be removed by sodium cyanide at pH ‡12. Both parent and leached catalysts were investigated. The activity of the leached gold-iron oxide catalyst in CO oxidation is approximately two orders of magnitude lower than that of the parent material. However, after exposure to H 2 up to 400°C gold diffuses out and is in reduced form on the surface, a process accompanied by a dramatic enhancement of the CO oxidation activity. Similar results were found with the gold-ceria catalysts. On the other hand, pre-reduction of the calcined leached catalyst samples did not promote their water-gas shift activity. UV-Vis, XANES and XPS were used to probe the oxidation state of the catalysts after various treatments.

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Ultrastable Gold Nanocatalyst Supported by Nanosized Non-Oxide Substrate

Cited by 104 publications

References 60 publications

Insights into the reactivity of supported Au nanoparticles: combining theory and experiments

Insights into the reactivity of supported Au nanoparticles: combining theory and experiments

Toward an Atomic-Level Understanding of Size-Specific Properties of Protected and Stabilized Gold Clusters

Comparison of the activity of Au/CeO2 and Au/Fe2O3 catalysts for the CO oxidation and the water-gas shift reactions

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