Surface Behavior of Alumina-Supported Pt Catalysts Modified with Cerium as Revealed by X-ray Diffraction, X-ray Photoelectron Spectroscopy, and Fourier Transform Infrared Spectroscopy of CO Adsorption

Riguetto, B.A.; Damyanova, S.; Gouliev, G.; Marques, C.M.P.; Petrov, and Lachezar; Bueno, J.M.C.

doi:10.1021/jp031167s

Cited by 110 publications

(74 citation statements)

References 65 publications

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“…3B. In the spectra, there are six peaks corresponding to three pairs of spin-orbit doublets similar to spectrum of oxidized CeO 2 as previously described elsewhere [20,21]. The 3d 5/2 features at 881.8, 887.3 and 897.8 eV correspond to v , v II and v III components, respectively.…”

Section: Resultssupporting

confidence: 69%

Effect of CeO2 and La2O3 on the Activity of CeO2−La2O3/Al2O3-Supported Pd Catalysts for Steam Reforming of Methane

et al. 2007

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The effect of the addition of CeO 2 or La 2 O 3 on the surface properties and catalytic behaviors of Al 2 O 3 -supported Pd catalysts was studied in the steam reforming of methane. The FTIR spectroscopy of adsorbed CO and the Pd dispersion suggest the partial coverage of Pd 0 by ceria or lanthana species. This could lead to the formation of an adduct MPd x O (M = Ce or La) at the surface of the metal crystallites. The addition of ceria or lanthana resulted in an increase of the turnover rate and specific rate for steam reforming of methane. One possible explanation if that the Pd 0 *Pd d+ O-M interfacial species (M = Ce or La) are oxidized by H 2 O or CO 2 , promoting the O* transfer to the metal surface. This could facilitate the removal of C* species from the metal surface, resulting in the increase of specific reaction rate and increase of the accessibility of CH 4 to metal active sites.

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Section: Resultssupporting

confidence: 69%

Effect of CeO2 and La2O3 on the Activity of CeO2−La2O3/Al2O3-Supported Pd Catalysts for Steam Reforming of Methane

et al. 2007

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“…The energy regions of Ce 3d, Sn 3d 5/2 and Pt 4d 5/2 core levels in calcined and reduced (at 473 and 773 K) samples were recorded. Although the most intense photoemission lines of platinum were those arising from the Pt 4f levels, this energy region became overshadowed by the presence of a very strong Al 2p peak, and the Pt 4d lines were thus analyzed instead [21,22]. The fresh calcined samples showed an asymmetric broad Pt 4d 5/2 peak ( Figure 1 with the work reported by Navarro et al [22] where a shift to lower binding energies was found in cerium-containing platinum catalysts.…”

Section: X-ray Photoelectronic Spectroscopymentioning

confidence: 54%

Effect of Sn addition to Pt/CeO2–Al2O3 and Pt/Al2O3 catalysts: An XPS, 119Sn Mössbauer and microcalorimetry study

Serrano‐Ruiz

Huber

Sánchez-Castillo

et al. 2006

Journal of Catalysis

144

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The effect of Sn addition to Pt/CeO 2 -Al 2 O 3 and Pt/Al 2 O 3 catalysts was studied with X-ray photoelectron spectroscopy (XPS), 119 Sn Mössbauer spectroscopy and adsorption microcalorimetry of CO at room temperature. Catalysts were reduced in situ at 473 ("non-SMSI state") and 773 K ("SMSI state"). 119 Sn Mössbauer and XPS results indicated that the presence of cerium in bimetallic catalysts inhibited reduction of tin.Furthermore, it was found that tin facilitated reduction of cerium (IV) to cerium (III).Microcalorimetric analysis indicated that cerium addition caused the appearance of a more heterogeneous distribution of active sites, whereas tin addition led to a higher homogeneity of these sites.

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“…Figure 14 shows the XPS data of the calcined, reduced, and spent Pt/CoOx/Al2O3. Here, Pt4d rather than Pt4f data were analyzed, due to the strong interference caused by the Al2p peak [15,38]. The raw data were deconvoluted into three peaks assigned to Pt 4+ [39][40][41], Pt 2+ [42], and Pt 0 [40].…”

Section: Xps Characterization Of Pt Speciesmentioning

confidence: 99%

Pt/MOx/SiO2, Pt/MOx/TiO2, and Pt/MOx/Al2O3 Catalysts for CO Oxidation

et al. 2015

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Conventional supported Pt catalysts have often been prepared by loading Pt onto commercial supports, such as SiO2, TiO2, Al2O3, and carbon. These catalysts usually have simple metal-support (i.e., Pt-SiO2) interfaces. To tune the catalytic performance of supported Pt catalysts, it is desirable to modify the metal-support interfaces by incorporating an oxide additive into the catalyst formula. Here we prepared three series of metal oxide-modified Pt catalysts (i.e., Pt/MOx/SiO2, Pt/MOx/TiO2, and Pt/MOx/Al2O3, where M = Al, Fe, Co, Cu, Zn, Ba, La) for CO oxidation. Among them, Pt/CoOx/SiO2, Pt/CoOx/TiO2, and Pt/CoOx/Al2O3 showed the highest catalytic activities. Relevant samples were characterized by N2 adsorption-desorption, X-ray diffraction (XRD), transmission electron microscopy (TEM), H2 temperature-programmed reduction (H2-TPR), X-ray photoelectron spectroscopy (XPS), CO temperature-programmed desorption (CO-TPD), O2 temperature-programmed desorption (O2-TPD), and CO2 temperature-programmed desorption (CO2-TPD).

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Surface Behavior of Alumina-Supported Pt Catalysts Modified with Cerium as Revealed by X-ray Diffraction, X-ray Photoelectron Spectroscopy, and Fourier Transform Infrared Spectroscopy of CO Adsorption

Cited by 110 publications

References 65 publications

Effect of CeO2 and La2O3 on the Activity of CeO2−La2O3/Al2O3-Supported Pd Catalysts for Steam Reforming of Methane

Effect of CeO2 and La2O3 on the Activity of CeO2−La2O3/Al2O3-Supported Pd Catalysts for Steam Reforming of Methane

Effect of Sn addition to Pt/CeO2–Al2O3 and Pt/Al2O3 catalysts: An XPS, 119Sn Mössbauer and microcalorimetry study

Pt/MOx/SiO2, Pt/MOx/TiO2, and Pt/MOx/Al2O3 Catalysts for CO Oxidation

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