Influence of Ceria on Pd Activity for the CO+O2 Reaction

Fernández, M.; Martı́nez-Arias, A.; Salamanca, L.N.; Coronado, Juan M.; Anderson, James A.; Conesa, J.C.; Soria, J.

doi:10.1006/jcat.1999.2624

Cited by 159 publications

(90 citation statements)

References 26 publications

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“…In this sense, as the Pd NPs are surrounded by a polymer protective shell, not all Pd surface sites are available and the amount of CO adsorbed can be considered as an estimation of the accessible Pd sites, irrespective of their being Pd 0 or Pd δ+ as it has been previously reported. 49,50 According to this, the increase in the CO adsorption with the aging time can be attributed to the PVP dissolution from the NPs surface when the colloid is suspended in methanol (as it has been seen by FTIR) producing an increase of the accessible Pd sites in the NPs surface. Thus, the differences in the adsorbed CO can be attributed to the polymer coverage/protection of the PVP on the NPs surface and the free accessible Pd.…”

Section: Resultsmentioning

confidence: 84%

Evolution of the PVP–Pd Surface Interaction in Nanoparticles through the Case Study of Formic Acid Decomposition

et al. 2016

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Palladium nanoparticles (Pd NPs) were synthesised by the reduction-by-solvent method using polyvinylpirrolidone (PVP) as capping agent. The non-static interaction between PVP and the metallic surface may change the properties of the NPs due to the different possible interactions, either through the O or N atoms of the PVP. In order to analyse these effects and their repercussion in their catalytic performance, Pd NPs with various PVP/Pd molar ratios (1, 10 and 20) were prepared, deposited on silica and tested in the formic acid decomposition reaction. The catalytic tests were conducted using catalysts prepared by loading NPs with three different time lapses between their purification and their deposition on the silica support (1 day, 1 month, and 6 months). CO adsorption, FTIR spectroscopy, XPS and TEM characterisation were used to determine the accessibility of the Pd NPs surface sites, electronic state of Pd and the average NPs size, respectively. The H 2 production from the formic acid decomposition reaction has a strong dependence with the Pd surface features, which in turn are related to the NPs aging time due to the progressive removal of the PVP.

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Section: Resultsmentioning

confidence: 84%

Evolution of the PVP–Pd Surface Interaction in Nanoparticles through the Case Study of Formic Acid Decomposition

et al. 2016

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“…The above characterizations proved that the activity of Pd/TiO 2 and Pd/CeO 2 -TiO 2 is higher than that of Pd/CeO 2 [37][38][39], and the reduced catalysts are much more active than the corresponding calcined samples, which means that metallic Pd is more active than Pd species at higher valence. The DRIFTS and CO/H 2 -TPR [18] show that PdO in Pd/TiO 2 and Pd/CeO 2 -TiO 2 is readily reduced to metallic Pd under the reaction conditions, whereas Pd species at high valence (Pd 2+ and Pd + ) are more stable on Pd/CeO 2 than those on Pd/TiO 2 and Pd/CeO 2 -TiO 2 .…”

Section: Reaction Mechanismsmentioning

confidence: 99%

Low-temperature oxidation of CO over Pd/CeO2–TiO2 catalysts with different pretreatments

Zhu

Qin

Shan

et al. 2005

Journal of Catalysis

146

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“…[1][2][3] It has also demonstrated remarkable performance in hydrogen storage at room temperature and atmospheric pressure. [4] In organic chemistry, a large number of carbon-carbon bond forming reactions such as Suzuki, Heck, and Stille coupling all depend on catalysts based upon Pd(0) or its compounds.…”

Section: Introductionmentioning

confidence: 99%

Shape‐Controlled Synthesis of Pd Nanocrystals in Aqueous Solutions

Lim

Jiang

Tao

et al. 2009

Adv Funct Materials

599

486

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This article provides an overview of recent developments regarding synthesis of Pd nanocrystals with well‐controlled shapes in aqueous solutions. In a solution‐phase synthesis, the final shape taken by a nanocrystal is determined by the twin structures of seeds and the growth rates of different crystallographic facets. Here, the maneuvering of these factors in an aqueous system to achieve shape control for Pd nanocrystals is discussed. L‐ascorbic acid, citric acid, and poly(vinyl pyrrolidone) are tested for manipulating the reduction kinetics, with citric acid and Br– ions used as capping agents to selectively promote the formation of {111} and {100} facets, respectively. The distribution of single‐crystal versus multiple‐twinned seeds can be further manipulated by employing or blocking oxidative etching. The shapes obtained for the Pd nanocrystals include truncated octahedron, icosahedron, octahedron, decahedron, hexagonal and triangular plates, rectangular bar, and cube. The ability to control the shape of Pd nanocrystals provides a great opportunity to systematically investigate their catalytic, electrical, and plasmonic properties.

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Influence of Ceria on Pd Activity for the CO+O2 Reaction

Cited by 159 publications

References 26 publications

Evolution of the PVP–Pd Surface Interaction in Nanoparticles through the Case Study of Formic Acid Decomposition

Evolution of the PVP–Pd Surface Interaction in Nanoparticles through the Case Study of Formic Acid Decomposition

Low-temperature oxidation of CO over Pd/CeO2–TiO2 catalysts with different pretreatments

Shape‐Controlled Synthesis of Pd Nanocrystals in Aqueous Solutions

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