Benzene Hydrogenation as a Tool for the Determination of the Percentage of Metal Exposed on Low Loaded Ceria Supported Rhodium Catalysts

Fajardie, Franck; Tempere, J. F.; Djéga‐Mariadassou, Gérald; Blanchard, G.

doi:10.1006/jcat.1996.0306

Cited by 59 publications

(35 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…[101][102][103][104] With this reaction it is possible to determine the amount of the accessible metallic atoms of low-loaded supported rhodium catalysts. [102,104] A Ni/CeO 2 catalyst exhibited a different behavior from that observed with Al 2 O 3 or SiO 2 supports. The modification of the catalytic properties of Ni/CeO 2 catalysts with reduction pretreatment is correlated to a transformation of the CeO 2 support and to strong interactions between theses species and metal particles.…”

Section: Hydrogenation Of Sunflower Oilmentioning

confidence: 99%

Ceria‐Based Solid Catalysts for Organic Chemistry

Vivier¹,

Duprez²

2010

ChemSusChem

363

244

View full text Add to dashboard Cite

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.

show abstract

Section: Hydrogenation Of Sunflower Oilmentioning

confidence: 99%

Ceria‐Based Solid Catalysts for Organic Chemistry

Vivier¹,

Duprez²

2010

ChemSusChem

363

244

View full text Add to dashboard Cite

show abstract

“…Insensitive structure reactions such as cyclohexane aromatization and benzene hydrogenation are good alternatives to determining the active metallic surface area in catalysts when lanthanides are present [21,22].…”

Section: Cyclohexane Dehydrogenation Activitymentioning

confidence: 99%

Effect of lanthanum on the catalytic properties of PtSn/γ-Al2O3 bimetallic catalysts prepared by successive impregnation and controlled surface reaction

Angel

Bonilla

Peña

et al. 2003

Journal of Catalysis

View full text Add to dashboard Cite

Bimetallic PtSn/γ -Al 2 O 3 -La 2 O 3 catalysts were prepared by two comparative methods, successive impregnation (SI) and controlled surface reaction (CSR). FTIR-pyridine adsorption revealed a decrease in support acidity as a function of lanthanum content. Oxidized Pt 2+ was identified by CO-FTIR chemisorption and by XPS spectra on catalysts prepared by SI. When the CSR preparation method was used, reduced Pt 0 was observed and oxidized Pt 2+ was not detected. As the lanthanum content increased a diminution in cyclohexane dehydrogenation and n-heptane conversion was observed. Low hydrogenolysis and high selectivity to C 7 -olefins were obtained in both preparations. It is proposed that lanthanum in SI catalysts stabilizes the platinum in an oxidation state, Pt 2+ , and diminishes the support acidity. In CSR preparations the lanthanum effect is limited to inhibit the support acidity and hence to the bifunctional reactions occurring during the n-heptane conversion.

show abstract

“…It seems clear from previous studies that CeO 2 enhances both the catalytic activity and the selectivity towards the hydrogenation of the carbonyl bond after reduction at high temperature [7][8][9][10]. The effect of the residual chlorine on ceria based catalysts has been reported to affect different processes such as H 2 and CO chemisorption [35], benzene hydrogenation [33], and selective hydrogenation of crotonaldehyde [10,11]. Abid et al [10] observed the formation of CePt 5 particles in a chlorine-free Pt/CeO 2 catalyst, after reduction at 973 K, which provided more than 80% crotyl alcohol selectivity.…”

Section: Catalytic Behaviormentioning

confidence: 99%

“…An estimation of the amount of platinum surface atoms in these systems can be achieved by determining their catalytic activity in a structure-insensitive reaction. In this way, benzene hydrogenation [33] and toluene hydrogenation [9] have been recently used to fulfill this objective. Thus, Fajardie et al [33] obtained a good correlation between the amount of exposed metal atoms determined by benzene hydrogenation, and calculated from hydrogen chemisorption in chlorine-containing catalysts, where hydrogen spillover from the metallic particle to the ceria support is inhibited.…”

Section: Catalytic Behaviormentioning

confidence: 99%

“…In this way, benzene hydrogenation [33] and toluene hydrogenation [9] have been recently used to fulfill this objective. Thus, Fajardie et al [33] obtained a good correlation between the amount of exposed metal atoms determined by benzene hydrogenation, and calculated from hydrogen chemisorption in chlorine-containing catalysts, where hydrogen spillover from the metallic particle to the ceria support is inhibited. Benzene hydrogenation measurements gave more accurate results of the total amount of exposed atoms in the case of chlorine-free catalysts.…”

Section: Catalytic Behaviormentioning

confidence: 99%

See 1 more Smart Citation

Effect of the presence of chlorine in bimetallic PtZn/CeO2 catalysts for the vapor-phase hydrogenation of crotonaldehyde

Silvestre-Albero

Coloma

Sepúlveda-Escribano

et al. 2006

Applied Catalysis A: General

View full text Add to dashboard Cite

The effect of the reduction temperature has been studied on ceria-supported bimetallic platinum-zinc catalysts prepared from H 2 PtCl 6 and Pt(NH 3 ) 4 (NO 3 ) 2 as the platinum precursors and Zn(NO 3 ) 2 as the zinc precursor. The catalysts have been characterized by X-ray diffraction (XRD), temperature-programmed reduction (TPR), and X-ray photoelectron spectroscopy (XPS), and their catalytic behavior has been evaluated in the vapor-phase hydrogenation of toluene and of crotonaldehyde (2-butenal) after reduction at low (473 K) and high (773 K) temperatures. The increase in the reduction temperature produces a strong decrease in the catalytic activity for toluene hydrogenation in both systems, but an important increase of activity for crotonaldehyde hydrogenation, which is more evident for the chlorine-free catalyst. The selectivity towards the hydrogenation of the carbonyl bond to yield the unsaturated alcohol (crotyl alcohol, 2-buten-1-ol) also increases after reduction at high temperature, being somewhat higher for the Cl-containing catalyst. The results are discussed in terms of differences in surface composition of the catalysts.

show abstract

Benzene Hydrogenation as a Tool for the Determination of the Percentage of Metal Exposed on Low Loaded Ceria Supported Rhodium Catalysts

Cited by 59 publications

References 0 publications

Ceria‐Based Solid Catalysts for Organic Chemistry

Ceria‐Based Solid Catalysts for Organic Chemistry

Effect of lanthanum on the catalytic properties of PtSn/γ-Al2O3 bimetallic catalysts prepared by successive impregnation and controlled surface reaction

Effect of the presence of chlorine in bimetallic PtZn/CeO2 catalysts for the vapor-phase hydrogenation of crotonaldehyde

Contact Info

Product

Resources

About