Au–metal oxide support interface as catalytic active sites

Wu, Yi; Mashayekhi, Neema A.; Kung, Harold H.

doi:10.1039/c3cy00243h

Cited by 76 publications

(50 citation statements)

References 107 publications

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“…the exposed surface area of the active phase and the stability [20]. The importance of metal oxide interfaces has long been recognized [21][22], however they have not being explored until recently [23]. Different kinds of metal atoms, ranging from metallic to ionic, are available at the interface which along with the oxide support create reaction sites for WGS reaction [24].…”

mentioning

confidence: 99%

Comparative study for low temperature water-gas shift reaction on Pt/ceria catalysts: Role of different ceria supports

Jain

Poyraz

Gamliel

et al. 2015

Applied Catalysis A: General

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confidence: 99%

Comparative study for low temperature water-gas shift reaction on Pt/ceria catalysts: Role of different ceria supports

Jain

Poyraz

Gamliel

et al. 2015

Applied Catalysis A: General

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“…It has been demonstrated that highly-dispersed Au NPs ≤ 5 nm in size typically exhibit the highest catalytic activity. 9,10 Although Au and Au-Pd NPs supported on Al 2 O 3 , SiO 2 and carbon are active for selective oxidation, they are notably more active when deposited on reducible metal oxides such as CeO 2 , TiO 2 and Fe 2 O 3 , 11,12 which has been attributed to the metal-support interaction and the ability of these materials to activate oxygen molecules. In particular, CeO 2 is a very reactive support due to its distinctive redox properties, and ability to reversibly exchange lattice oxygen in response to changes in the oxidation state of Ce atoms between Ce 4+ and Ce 3+ .…”

Section: Introductionmentioning

confidence: 99%

Au–Pd NPs immobilised on nanostructured ceria and titania: impact of support morphology on the catalytic activity for selective oxidation

Khawaji

Chadwick

2018

Catal. Sci. Technol.

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Bimetallic Au-Pd nanoparticles supported on different ceria and titania nanostructures have been prepared by sol-immobilisation, and evaluated in the solvent-less selective oxidation of benzyl alcohol. The catalysts were characterised by TEM, STEM, XRD, XPS, ICP-AES, and nitrogen adsorption-desorption measurements.The activity of the catalysts was found to be strongly related to the morphology, structure and physiochemical properties of the supports. Au-Pd/ceria nanorods exhibited remarkably high catalytic activity (TOF > 35 900 h −1 ), and was found to be considerably more active than Au-Pd/titanate nanotubes, and Au-Pd catalysts supported on conventional ceria and titania nanopowders. The outstanding catalytic performance of Au-Pd/ceria nanorods is attributed to the unique surface chemistry of ceria nanorods, and the ability of catalyst preparation method (i.e. sol-immobilisation) to control the metal particle size and the bimetallic alloy formation. The presence of surface defects and high concentration of oxygen vacancies and Ce 3+ in ceria nanorods is likely responsible for the stabilisation of Au-Pd NPs during sol-immobilisation, which led to a very small mean particle size (2.1 nm) corresponding to a dispersion of approximately 52%, and a high surface metal concentration.

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“…[4] For example, titania-supported Au catalysts prepared by deposition-precipitation were reported to be capable of catalyzing CO oxidation at temperatures as low as 90 K. [5] However, the activities of Au catalysts are not simply dependent on the Au surface area but are strongly dependent on structure, [6] with large Au particles exhibiting very low or no activity and specific clusters/structures being responsible for the overall observed catalytic rate. [7] The composition of the support is also critically important; and, although high activities have been reported for Au particles deposited on various oxides, [8][9][10] the best results are usually obtained with titania. [11] Indeed, many authors have reported that a synergetic effect between Au and TiO 2 is responsible for high activity, with the active sites located at the interface between Au and TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

Au@TiO2 Core–Shell Nanostructures with High Thermal Stability

et al. 2014

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A catalyst system consisting of core-shell nanostructures with Au core and porous TiO 2 shell was synthesized and characterized for room temperature CO oxidation. The core-shell structures were prepared by colloidal methods starting from pre-formed 3 nm Au particles in solution and then adsorbed on to high-surface area, functionalized hydrophobic Al 2 O 3 support. The obtained Au@TiO 2 /Si-Al 2 O 3 catalyst showed higher activity and thermal stability when compared to a conventional Au/ TiO 2 sample prepared by impregnation of the same Au particles on to commercial titania P25. The core-shell catalyst was able to maintain its activity and 3 nm Au particles size upon calcination up to 600°C, whereas the Au/TiO 2 sample was found to sinter. Furthermore, it was found that the crystallization of TiO 2 was suppressed in the core-shell structure, resulting in a thin layer of small TiO 2 particles, which is favorable for the dispersion and thermal stability of Au nanoparticles.

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Au–metal oxide support interface as catalytic active sites

Cited by 76 publications

References 107 publications

Comparative study for low temperature water-gas shift reaction on Pt/ceria catalysts: Role of different ceria supports

Comparative study for low temperature water-gas shift reaction on Pt/ceria catalysts: Role of different ceria supports

Au–Pd NPs immobilised on nanostructured ceria and titania: impact of support morphology on the catalytic activity for selective oxidation

Au@TiO2 Core–Shell Nanostructures with High Thermal Stability

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