Supported Au catalysts for low temperature CO oxidation

Kung, Harold H.; Kung, Mayfair C.; Costello, C. K.

doi:10.1016/s0021-9517(02)00111-2

Cited by 455 publications

(323 citation statements)

References 51 publications

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“…Although most of the examples were taken from our own work, references to the wider literature were made when appropriate. We need to emphasize here again that most of the reviews in this field deal with new preparation methods, synthesis details, catalytic reactions, and the nature of the active sites and reaction mechanisms [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33], with a very limited number written from a materials perspective [89]. From the references cited herein, one can see that the use of a materials perspective to develop new gold catalysts has resulted in rapid progress in recent years.…”

Section: Resultsmentioning

confidence: 99%

“…The bulk of publications deal with the preparation and characterization of conventional gold catalysts (e.g., Au/TiO 2 ), the applications of gold catalysts in different reactions, as well as elucidation of the nature of the active sites and reaction mechanisms [26][27][28][29][30][31][32][33]. Many papers have elaborated on the effects of different preparation methods (e.g., deposition-precipitation, coprecipitation, colloidal deposition) and synthesis details (e.g., pH value and temperature of the synthesis mixture, duration of aging, gold loading, calcination temperature) on catalyst properties and catalytic performance [34][35][36][37][38][39][40], and have furnished firm grounds for a scientific understanding of catalyst preparation.…”

Section: Introductionmentioning

confidence: 99%

“…Rather, the examples highlighted are mostly from those reported by our group. Although there are a number of reviews on various aspects of gold catalysis [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33], few have specifically focused on the development of novel gold catalysts from a materials perspective [89].…”

Section: Introductionmentioning

confidence: 99%

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Development of novel supported gold catalysts: A materials perspective

2010

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Since Haruta et al. discovered that small gold nanoparticles finely dispersed on certain metal oxide supports can exhibit surprisingly high activity in CO oxidation below room temperature, heterogeneous catalysis by supported gold nanoparticles has attracted tremendous attention. The majority of publications deal with the preparation and characterization of conventional gold catalysts (e.g., Au/TiO 2 ), the use of gold catalysts in various catalytic reactions, as well as elucidation of the nature of the active sites and reaction mechanisms. In this overview, we highlight the development of novel supported gold catalysts from a materials perspective. Examples, mostly from those reported by our group, are given concerning the development of simple gold catalysts with single metal-support interfaces and heterostructured gold catalysts with complicated interfacial structures. Catalysts in the first category include active Au/SiO 2 and Au/metal phosphate catalysts, and those in the second category include catalysts prepared by pre-modification of supports before loading gold, by post-modification of supported gold catalysts, or by simultaneous dispersion of gold and an inorganic component onto a support. CO oxidation has generally been employed as a probe reaction to screen the activities of these catalysts. These novel gold catalysts not only provide possibilities for applied catalysis, but also furnish grounds for fundamental research.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development of novel supported gold catalysts: A materials perspective

2010

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“…The unique activities of highly dispersed nanosized Au particles on oxide surfaces [1][2][3][4][5][6][7][8][9][10][11][12][13][14]42 are found to strongly correlate with the Au particle size; for example, the highest turnover frequency (TOF, reaction rate per surface Au site per second) occurs at a particle size of ∼3 nm. A model catalytic system, Au/TiO 2 (110), was used to investigate this unusual catalytic phenomenon under realistic reaction conditions.…”

Section: Active Au Catalysts: From Nanoparticles To Ordered Thin Filmsmentioning

confidence: 99%

Catalytically Active Gold: From Nanoparticles to Ultrathin Films

Chen

Goodman

2006

ChemInform

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Ordered gold (Au) mono-and bilayer structures have been synthesized on a highly reduced titania surface. The Au bilayer exhibits a significantly higher catalytic activity for carbon monoxide oxidation than does the Au monolayer structure. This is the first report of Au completely wetting an oxide surface and demonstrates that ultrathin Au films on an oxide surface have exceptionally high catalytic activity, comparable to the activity observed for Au nanoparticles. This discovery is a key to understanding the nature of the active site of supported Au catalysts.

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“…17,24 One of the simplest and the most studied catalytic reaction on gold clusters is a low-temperature CO oxidation by molecular oxygen. 1,2,10,12,17,[24][25][26][27][28][29][30][31] It has been demonstrated that dispersed gold supported on Co 3 O 4 , NiO, TiO 2 , and Fe 2 O 3 possesses high catalytic activity for CO oxidation. [32][33][34][35] These supports affect dramatically the catalytic activity of gold clusters.…”

Section: Introductionmentioning

confidence: 99%

CO oxidation on h-BN supported Au atom

Gao

Lyalin

Taketsugu

2013

The Journal of Chemical Physics

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The mechanism of CO oxidation by O 2 on Au atoms supported on the pristine and defected hexagonal boron nitride (h-BN) surface has been studied theoretically using density functional theory. It is found that O 2 binds stronger than CO on an Au atom supported on the defect free h-BN surface and h-BN surface with nitrogen vacancy (V N @h-BN), but weaker than CO on a free Au atom or Au trapped by a boron vacancy (V B @h-BN). The excess of the positive or negative charge on Au can considerably change its catalytic properties and enhance activation of the adsorbed O 2 . Coadsorption of CO and O 2 on Au, Au/V N @h-BN, and Au/V B @h-BN results in additional charge transfer to O 2 . Various pathways of the CO oxidation reaction by molecular oxygen are studied. We found two different pathways for CO oxidation: a two-step pathway where two CO 2 molecules are formed independently, and a self-promotion pathway where oxidation of the first CO molecule is promoted by the second CO molecule. Interaction of Au with the defect-free and defected h-BN surface considerably affects the CO oxidation reaction pathways and barriers. Therefore, Au supported on the h-BN surface (pristine or defected) cannot be considered as pseudo-free atom and support effects have to be taken into account, even when the interaction of Au with the support is weak.

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Supported Au catalysts for low temperature CO oxidation

Cited by 455 publications

References 51 publications

Development of novel supported gold catalysts: A materials perspective

Development of novel supported gold catalysts: A materials perspective

Catalytically Active Gold: From Nanoparticles to Ultrathin Films

CO oxidation on h-BN supported Au atom

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