Interaction of CO with Pt Supported on ZrO2(100): Evidence for CO Adsorbed at the Pt-ZrO2 Interface

Dilara, P. A.; Vohs, John M.

doi:10.1021/j100047a033

Cited by 26 publications

(18 citation statements)

References 10 publications

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“…Additional support to the existence of metal-zirconia interactions is the lower desorption temperature of a single CO molecule absorbed on submonolayer Pt films, as compared with the temperatures found for low Pt coverages on non-interacting substrates. A later study of the same system using a combination of AES and high-resolution electron energy loss spectroscopy (HREELS) [268] is consistent with all these results. It also proves that Pt grows in a layer-by-layer mode on the ZrO 2 (100) surface at 300 K, and that heating to temperatures in excess of 700 K causes the Pt films to agglomerate into particles.…”

Section: Chemical Characterizationsupporting

confidence: 70%

Adhesion at metal–ZrO2 interfaces

Muñoz

Gallego

Beltrán

et al. 2006

Surface Science Reports

186

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Section: Chemical Characterizationsupporting

confidence: 70%

Adhesion at metal–ZrO2 interfaces

Muñoz

Gallego

Beltrán

et al. 2006

Surface Science Reports

186

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“…The increasing vibration frequency of CO can be explained by an electron transfer phenomenon from platinum particles to partially reduced zirconia, which decreases the Pt-CO bond strength. Dilara and Vohs [14] also observed the CO adsorption on the Pt-ZrO 2 interface, and they proposed a bonding configuration where the carbon end of the CO molecule would be bounded to platinum while the oxygen end interacts with Zr nþ cations on the surface of the oxide.…”

Section: The Pt-zro 2 Interfacementioning

confidence: 98%

Surface Characterization of Zirconia-Coated Alumina as Support for Pt Particles

Souza¹,

Aranda²,

Perez³

et al. 2001

phys. stat. sol. (a)

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ZrO 2 /Al 2 O 3 samples were prepared by impregnation of the alumina powder with a solution of zirconium hydroxide in nitric acid, containing ZrO 2 in the range of 1-20 wt%. Platinum was impregnated by incipient wetness technique, using an aqueous solution of H 2 PtCl 6 . The surface coverage of zirconia on alumina, as probed by XPS and ISS, increased up to 10 wt% of ZrO 2 and above this concentration crystallites of zirconia nucleated, which decreases the BET surface area. XRD measurements indicated that the average size of these crystallites was about 1 nm. ISS data of Pt/ZrO 2 and Pt/10%ZrO 2 /Al 2 O 3 catalysts, after reduction at 773 K indicated an increase in the surface population of Zr atoms which are able to catch CO. This interaction was also probed by FTIR spectra of CO adsorbed on Pt/ZrO 2 catalyst, where an intense band at 2130 cm --1 , associated to CO adsorption on Pt-ZrO x interface, was observed.

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“…A bridging interaction is also possible here; certainly there is evidence for CO bridging between a group VIII metal M particle and its zirconia support via H ~C----O Zr4-/- [20]. CO2 adsorption on zirconia has been seen to indicate and probe surface acid sites, especially Lewis acid sites associated with exposed surface Zr 4+ cations; on zirconia monodentate and bidentate carbonates have been seen [18] as well as bicarbonate species, but different types of carbonate species were seen in higher concentrations on Y203/ZrO2.…”

Section: No + 3co = Nco + N20 + Co2mentioning

confidence: 77%

Doped-ZrO2 aerogels: Catalysts of controlled structure and properties

Sermon

Self

Sun

1997

J Sol-Gel Sci Technol

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Abstract. Doped ZrO2 aerogels (characterised by TEM, DTA and N2 adsorption) have been prepared and catalytically tested in CO/CO2 hydrogenation [1] and CH4 oxidation [2]. The primary aerogels showed cross-linked clusters of (X-ray) amorphous particles smaller than 5 nm which led to well-developed mesoporous solids with an average pore size of about 10 nm and high surface area (up to 250 m2g -1) [1]. Cu/ZrO2 aerogels (known to be very active and selective towards methanol synthesis in CO hydrogenation without predominant formation of alkanes even at higher temperatures [1]) are now seen to show these effects even more clearly in CO2 hydrogenation. In methane oxidation, both Rh/ZrO2 and Y2Oa/ZrO2 were very active. Consideration is given to the nature of the active sites, the role of CO2 and metal/oxide interfaces and how an understanding of this reactivity can lead to better dispersed ZrO2.

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Interaction of CO with Pt Supported on ZrO2(100): Evidence for CO Adsorbed at the Pt-ZrO2 Interface

Cited by 26 publications

References 10 publications

Adhesion at metal–ZrO2 interfaces

Adhesion at metal–ZrO2 interfaces

Surface Characterization of Zirconia-Coated Alumina as Support for Pt Particles

Doped-ZrO2 aerogels: Catalysts of controlled structure and properties

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