Au/TiO2 Nanosized Samples: A Catalytic, TEM, and FTIR Study of the Effect of Calcination Temperature on the CO Oxidation

Boccuzzi, F.; Chiorino, A.; Manzoli, Maela; Lü, Ping; Akita, Tomoki; Ichikawa, Satoshi; Haruta, Masatake

doi:10.1006/jcat.2001.3290

Cited by 497 publications

(457 citation statements)

References 25 publications

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“…Comparison of the stretching frequencies for CO adsorption on various supported Au catalyts. 46,[57][58][59][60][61][62] Catalytically Active Gold Chen and Goodman ν CO frequencies, or the extent of the electron-rich charge state of Au, is consistent with the order of the heats of adsorption for CO being monolayer Au on Mo > monolayer Au on titania > multilayer or bulk-like Au. 58 The electron-rich nature of Au nanoparticles is supported by theoretical calculations 30,45 and ancillary experimental data.…”

Section: Origins Of Exceptionally High Catalytic Activities For Nanosmentioning

confidence: 72%

“…2,9,14,17,19,28,31 The perimeter/contact area of the interface between the Au particles and the support has been proposed to serve as a unique reaction site where reactants are activated. 1,44,46 From theoretical calculations, the support has been shown to play an active role in the bonding and activation of adsorbates bound to Au. [47][48][49] Molina and Hammer 47 have proposed the active site to be low-coordinated Au atoms in combination with surface cations interacting simultaneously with an adsorbate.…”

Section: Active Site and Structure Of Au Catalystsmentioning

confidence: 99%

“…It has been shown that the ν CO mode shifts to lower frequency on electron-rich Au clusters and to higher frequency on electron-deficient clusters relative to bulk Au and that the extent of the shift can be correlated with the electronic charge on Au. 46,57,58 The ν CO frequencies for CO adsorption on ordered Au monolayer and bilayer structures are compared with monolayer and multilayer Au on Mo single crystals, together with pertinent literature data, in Figure 7. Note that the surface arrangements of the atoms in monolayer Au on a single crystal Mo surface and monolayer Au on a reduced titania surface are similar, with the exception that, in the former, Au binds directly to the substrate Mo while, in the latter, Au binds to the substrate via Ti.…”

Section: Origins Of Exceptionally High Catalytic Activities For Nanosmentioning

confidence: 99%

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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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Section: Origins Of Exceptionally High Catalytic Activities For Nanosmentioning

confidence: 72%

Section: Active Site and Structure Of Au Catalystsmentioning

confidence: 99%

Section: Origins Of Exceptionally High Catalytic Activities For Nanosmentioning

confidence: 99%

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Catalytically Active Gold: From Nanoparticles to Ultrathin Films

Chen

Goodman

2006

ChemInform

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“…4) is most probably related to the reduction of oxygen species on some nano-Au particles smaller than 2 nm absorbed during calcination in air in accordance with Boccuzzi et al . [71] …”

Section: Co-based Catalystsmentioning

confidence: 99%

The water‐gas shift reaction: from conventional catalytic systems to Pd‐based membrane reactors—a review

Mendes

Madeira

et al. 2009

Asia-Pacific J Chem Eng

200

109

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The water-gas shift (WGS) reaction is a well-known step for upgrading carbon monoxide to hydrogen in the production of synthesis gas. For more than 90 years after its first industrial application, many issues in respect of the catalyst, process configuration, reactor design, reaction mechanisms and kinetics have been investigated. More recently, a renewed interest in the WGS reaction carried out in hydrogen perm-selective membrane reactors (MRs) has been observed because of the growing use of polymeric electrolyte membrane (PEM) fuel cells that operate using high-purity hydrogen. Moreover, MRs are viewed as an interesting technology in order to overcome the equilibrium conversion limitations in traditional reactors.This article reviews the most relevant topics of WGS MR technology -catalysis and membrane science. The most used catalysts and relevant progress achieved so far are described and critically reviewed. The effects of the most important parameters affecting the WGS in MRs are detailed. In addition, an overview on the most used membranes in MRs is also presented and discussed. 

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“…[7][8][9][10] In addition to providing information about the major surface-bound products, the infrared spectra enable us to monitor the oxidation state of the Au particles during the reaction. Previous theoretical 11 and experimental 12,13 studies have shown that the vibrational frequency of surface-bound CO is highly sensitive to the site of adsorption on Au surfaces. The inset in Fig.…”

Section: Hrtem Of 22 Nm Particlesmentioning

confidence: 99%

Adsorption and Decomposition of CWA Simulants on Single Crystal and Nanostructured Metal Oxides

Morris¹

2009

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Tech Final Report I. ForewordOur studies are directed at determining the adsorption mechanisms and reaction pathways for the chemical warfare agent simulant (CWA) for GB (Sarin) on metal oxide surfaces and nanoparticles. By learning about how surface structure, nanoparticle size, composition, and surface co-adsorbates affect the overall interfacial chemistry, we are providing insight that can be applied toward the development of effective sorbent materials for protection and decontamination. Our approach couples ultrahigh vacuum (UHV) surface analysis instrumentation with precision simulant dosing capabilities to explore agent reactivity on highly characterized and contaminant-free metal oxide surfaces. Our work during this funding period has focused on studying the uptake and decomposition of the simulant dimethyl methylphosphonate (DMMP) when it impinges on the surface of nanoparticulate systems.

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Au/TiO2 Nanosized Samples: A Catalytic, TEM, and FTIR Study of the Effect of Calcination Temperature on the CO Oxidation

Cited by 497 publications

References 25 publications

Catalytically Active Gold: From Nanoparticles to Ultrathin Films

Catalytically Active Gold: From Nanoparticles to Ultrathin Films

The water‐gas shift reaction: from conventional catalytic systems to Pd‐based membrane reactors—a review

Adsorption and Decomposition of CWA Simulants on Single Crystal and Nanostructured Metal Oxides

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