Low-temperature water–gas shift reaction over gold deposited on TiO2

Sakurai, Hiroaki; Ueda, Atsushi; Kobayashi, Tetsuhiko; Haruta, Masatake

doi:10.1039/a606192c

Cited by 192 publications

(125 citation statements)

References 7 publications

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“…[7][8][9][10][11][12][13] Strong metal-support interaction in which metals are anchored on active transition metal oxides such as TiO 2 , 14-19 CeO 2 , 20-24 and Fe 2 O 3 25-27 provides high activity for several reactions such as hydrogenation, [28][29][30] CO oxidation, [31][32][33][34][35] and water-gas shift reaction. [36][37][38][39] The underlying origin of the metal-support interaction and the promotional role of the active oxide supports in enhancing the catalytic activity and selectivity have thus been extensively studied. [40][41][42][43][44][45][46][47] Relatively, little is known about direct interfacial interaction between metal NPs and support oxide NPs in a confined geometry.…”

Section: Introductionmentioning

confidence: 99%

Confined Pt and CoFe₂O₄Nanoparticles in a Mesoporous Core/Shell Silica Microsphere and Their Catalytic Activity

Kang¹,

Eum²,

Lee³

et al. 2011

Bulletin of the Korean Chemical Society

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Confined Pt and CoFe 2 O 4 nanoparticles (NPs) in a mesoporous core/shell silica microsphere, Pt-CoFe 2 O 4 @meso-SiO 2 , were prepared using a bi-functional linker molecule. A large number of Pt NPs in Pt-CoFe 2 O 4 @meso-SiO 2 , ranging from 5 to 8 nm, are embedded into the shell and some of them are in close contact with CoFe 2 O 4 NPs. The hydrogenation of cyclohexene over the Pt-CoFe 2 O 4 @meso-SiO 2 microsphere at 25 o C and 1 atm of H 2 yields cyclohexane as a major product. In addition, it gives oxygenated products. Control experiments with 18O-labelled water and acetone suggest that surface-bound oxygen atoms in CoFe 2 O 4 are associated with the formation of the oxygenated products. This oxidation reaction is operative only if CoFe 2 O 4 and Pt NPs are in close contact. The Pt-CoFe 2 O 4 @meso-SiO 2 catalyst is separated simply by a magnet, which can be re-used without affecting the catalytic efficiency.

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Section: Introductionmentioning

confidence: 99%

Confined Pt and CoFe₂O₄Nanoparticles in a Mesoporous Core/Shell Silica Microsphere and Their Catalytic Activity

Kang¹,

Eum²,

Lee³

et al. 2011

Bulletin of the Korean Chemical Society

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“…A majority of the published work has focussed on precious metal catalysts. Ru/Fe 2 O 3 , Au/Fe 2 O 3 and Au/TiO 2 all were reported to have high CO conversion activity at 200 • C. [48][49][50] As found by Gorte et al and other groups, precious metals supported on ceria exhibit surprisingly high WGS activities. [20,22,29,51,52] Other groups investigated precious metals supported on zirconia.…”

Section: Catalyst Developmentsmentioning

confidence: 59%

Catalyst development for water–gas shift

Ladebeck¹,

Wagner²

2010

Handbook of Fuel Cells

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In the industrial production of hydrogen and of synthesis gas the water gas shift reaction represents an essential step for the overall process efficiency of the process by increasing the hydrogen yield and by adjusting the desired ratio of hydrogen and carbon monoxide for a subsequent synthesis step. In addition to that in fuel cell technology it is absolutely necessary to decrease the CO content of the fuel hydrogen due to the limited CO tolerance of present day fuel cell anodes. To be successful applying water gas shift catalysts in hydrogen production for fuel cells especially in automotive systems some major obstacles of the commercial Cu/Zn/Al catalyst systems must be overcome. Major new demands are reduction of volume and weight by two to three orders of magnitude, oxidation resistance and improved tolerance for steam condensation and poisons, here mainly sulfur present in gas feedstock and in gasoline. Precious metal catalyst systems on rare earth metal oxides are most promising and could fulfill the requirements in nonstationary applications were conventional catalysts are not applicable.

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“…For instance, Sakurai and co-workers found that Au/TiO 2 prepared using depositionprecipitation showed higher activity than Au/TiO 2 , Au/Fe 2 O 3 , Au/Al 2 O 3 , and Au/ZnO catalysts prepared using coprecipitation. 44 Flytzani-Stephanopoulos and co-workers prepared Au/Ce(4%La)O x catalysts via coprecipitation or deposition-precipitation and found that the catalytic rates were comparable to that on Cu/CeO 2 and better than that on Au/TiO 2 reported previously. 45 Andreeva and co-workers studied the influences of various parameters (i.e., gold loading, contact time, and the H 2 O/CO ratio) on the catalytic activity of Au/CeO 2 in WGSR.…”

Section: Introductionmentioning

confidence: 69%

“…In the initial publications on WGSR over supported gold catalysts, the focus was more on catalytic activity than on stability. [41][42][43][44] In recent years, more and more attention has been paid to the stability of gold catalysts in WGSR and their deactivation mechanisms. Osuwan and co-workers compared the catalytic performance of Pt/CeO 2 , Au/CeO 2 , and Au/Fe 2 O 3 in WGSR.…”

Section: Catalyst Stability and Deactivationmentioning

confidence: 99%

Water–gas shift on gold catalysts: catalyst systems and fundamental studies

Tao¹,

Ma²

2013

Phys. Chem. Chem. Phys.

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Since the pioneering finding by Haruta et al. that small gold nanoparticles on reducible supports can be highly active for low-temperature CO oxidation, the synthesis, characterization, and application of supported gold catalysts have attracted much attention. The water-gas shift reaction (WGSR: CO + H 2 O = CO 2 + H 2 ) is important for removing CO and upgrading the purity of H 2 for fuel cell applications, ammonia synthesis, and selective hydrogenation processes. In recent years, much attention has been paid to exploration the possibility of using supported gold nanocatalysts for WGSR and understanding the fundamental aspects related to catalyst deactivation mechanisms, nature of active sites, and reaction mechanisms. Here we summarize recent advances in the development of supported gold catalysts for this reaction and fundamental insights that can be gained, and furnish our assessment on the status of research progress.

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Low-temperature water–gas shift reaction over gold deposited on TiO2

Cited by 192 publications

References 7 publications

Confined Pt and CoFe₂O₄Nanoparticles in a Mesoporous Core/Shell Silica Microsphere and Their Catalytic Activity

Confined Pt and CoFe₂O₄Nanoparticles in a Mesoporous Core/Shell Silica Microsphere and Their Catalytic Activity

Catalyst development for water–gas shift

Water–gas shift on gold catalysts: catalyst systems and fundamental studies

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Low-temperature water–gas shift reaction over gold deposited on TiO2

Cited by 192 publications

References 7 publications

Confined Pt and CoFe2O4Nanoparticles in a Mesoporous Core/Shell Silica Microsphere and Their Catalytic Activity

Confined Pt and CoFe2O4Nanoparticles in a Mesoporous Core/Shell Silica Microsphere and Their Catalytic Activity

Catalyst development for water–gas shift

Water–gas shift on gold catalysts: catalyst systems and fundamental studies

Contact Info

Product

Resources

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Confined Pt and CoFe₂O₄Nanoparticles in a Mesoporous Core/Shell Silica Microsphere and Their Catalytic Activity

Confined Pt and CoFe₂O₄Nanoparticles in a Mesoporous Core/Shell Silica Microsphere and Their Catalytic Activity