Pt/CeO2 catalysts in crotonaldehyde hydrogenation: Selectivity, metal particle size and SMSI states

Abid, Mohamed; Paul‐Boncour, V.; Touroude, R.

doi:10.1016/j.apcata.2005.08.048

Cited by 108 publications

(51 citation statements)

References 36 publications

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“…This decoration effect occurs at lower temperatures for Metal/TiO 2 systems, and Datye, et al have postulated that the SMSI effect is different for Metal/TiO 2 and Metal/CeO 2 systems [7]. Using HRTEM they observed that Pt clusters grew in an epitaxial relation on CeO 2 , whereas reduced TiO 2 particles migrated onto Pt clusters when catalysts were reduced at 773 K. This result has been confirmed by Abid, et al who also observed that Pt particles 3-4 nm in size grew in an epitaxial pattern on ceria after reduction at 773 K [14]. Thus, it is possible that CeO x is able to modify the geometric properties of Pt [14].…”

Section: Introductionsupporting

confidence: 76%

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

141

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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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Section: Introductionsupporting

confidence: 76%

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

141

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“…Cerium-based platinum catalysts have been extensively studied for the hydrogenation of crotonaldehyde (CH 3 ÀCH=CHÀ CHO) [108][109][110][111][112][113][114][115][116][117][118] and citral ((CH 3 ) 2 C=CHÀ(CH 2 ) 2 ÀC(CH 3 )=CH-CHO). [119,120] The activation of the carbonyl bond is induced by the presence of oxygen vacancies sites located at the interface between ceria and the platinum particles.…”

Section: Hydrogenation Of A-b-unsaturated Aldehydesmentioning

confidence: 99%

“…[108][109][110] On chlorine-free Pt/CeO 2 , the crotyl alcohol selectivity increased up to more than 80 % (conversion: 45 %) when the reduction temperature of the catalysts reached 700 8C. The presence of chlorine, during the catalyst synthesis, preserves the catalytic properties of platinum metal www.chemsuschem.org for the hydrogenation of C=C bond; chlorine atoms around platinum particles inhibit the diffusion of cerium atoms inside the metal particles and prevents the formation of CePt 5 alloy.…”

Section: Hydrogenation Of A-b-unsaturated Aldehydesmentioning

confidence: 99%

“…By controlling the nanostructure, size, and morphology of supported platinum particles, the authors showed that it is possible to orientate the selectivity in the hydrogenation of crotonaldehyde. [110] The presence of zinc facilitated the reduction of surface ceria, thereby increasing the potential number of Ce 3+ -Pt metal interface sites, particularly in cases where small Pt particles were located in ceria rich zones of the support. [113][114][115] In the case of vapor-phase hydrogenation of crotonaldehyde, the overall catalytic activity increased significantly after reduction at 500 8C in the zinc-containing catalyst, and furthermore, the selectivity toward the hydrogenation of carbonyl bond is improved.…”

Section: Hydrogenation Of A-b-unsaturated Aldehydesmentioning

confidence: 99%

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Ceria‐Based Solid Catalysts for Organic Chemistry

Vivier¹,

Duprez²

2010

ChemSusChem

357

244

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Ceria has been the subject of thorough investigations, mainly because of its use as an active component of catalytic converters for the treatment of exhaust gases. However, ceria‐based catalysts have also been developed for different applications in organic chemistry. The redox and acid–base properties of ceria, either alone or in the presence of transition metals, are important parameters that allow to activate complex organic molecules and to selectively orient their transformation. Pure ceria is used in several organic reactions, such as the dehydration of alcohols, the alkylation of aromatic compounds, ketone formation, and aldolization, and in redox reactions. Ceria‐supported metal catalysts allow the hydrogenation of many unsaturated compounds. They can also be used for coupling or ring‐opening reactions. Cerium atoms can be added as dopants to catalytic system or impregnated onto zeolites and mesoporous catalyst materials to improve their performances. This Review demonstrates that the exceptional surface (and sometimes bulk) properties of ceria make cerium‐based catalysts very effective for a broad range of organic reactions.

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“…In fact, shapedependent activity of ceria has already been recognized in catalytic CO oxidation [11][12][13][14], NO reduction [15], water-gas shift reaction [16,17] and soot combustion [18]. The energy required to form oxygen vacancies on the {1 1 1} surface of CeO 2 is higher than those on {1 1 0} and {1 0 0} surfaces, so the concentration of oxygen vacancies on differents planes of ceria is different [19]. There are more oxygen vacancies on {1 1 0} and {1 0 0} planes, which are favorable for the catalytic reactions outlined above.…”

Section: Introductionmentioning

confidence: 99%

The influence of nano-architectured CeO supports in RhPd/CeO2 for the catalytic ethanol steam reforming reaction

Divins

Casanovas

et al. 2015

Catalysis Today

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a b s t r a c tThe ethanol steam reforming (ESR) reaction has been tested over RhPd supported on polycrystalline ceria in comparison to structured supports composed of nanoshaped CeO2 cubes and CeO2 rods tailored toward the production of hydrogen. At 650-700 K the hydrogen yield follows the trend RhPd/CeO2 -cubes > RhPd/CeO2 -rods > RhPd/CeO2 -polycrystalline, whereas at temperatures higher than 800 K the catalytic performance of all samples is similar and close to the thermodynamic equilibrium. The improved performance of RhPd/CeO2 -cubes and RhPd/CeO2 -rods for ESR at low temperature is mainly ascribed to higher water-gas shift activity and a strong interaction between the bimetallic-oxide support interaction. STEM analysis shows the existence of RhPd alloyed nanoparticles in all samples, with no apparent relationship between ESR performance and RhPd particle size. X-ray diffraction under operating conditions shows metal reorganization on {1 0 0} and {1 1 0} ceria crystallographic planes during catalyst activation and ESR, but not on {1 1 1} ceria crystallographic planes. The RhPd reconstructing and tuned activation over ceria nanocubes and nanorods is considered the main reason for better catalytic activity with respect to conventional catalysts based on polycrystalline ceria.

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Pt/CeO2 catalysts in crotonaldehyde hydrogenation: Selectivity, metal particle size and SMSI states

Cited by 108 publications

References 36 publications

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

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

Ceria‐Based Solid Catalysts for Organic Chemistry

The influence of nano-architectured CeO supports in RhPd/CeO2 for the catalytic ethanol steam reforming reaction

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