Gold supported CeO2/Al2O3 catalysts for CO oxidation: influence of the ceria phase

Centeno, M.A.; Portalés, Cristina; Carrizosa, I.; Odriozola, J.A.

doi:10.1007/s10562-005-5871-5

Cited by 94 publications

(68 citation statements)

References 35 publications

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“…% Au, was dissolved in deionized water (6.0 x 10 -4 M) and the pH of the solution adjusted to 8 by addition of NaOH 0.1 M with an automatic system of measurement and titration (CRISON® pH-Burette 24). This pH value has been reported as adequate for a successful deposition of gold on ceria surfaces [38,39]. The solution was heated to 70 °C and then the support was added and kept under continuous stirring for 20 min.…”

Section: Synthesis Of the Catalystsmentioning

confidence: 96%

Gold supported on CuOx/CeO2 catalyst for the purification of hydrogen by the CO preferential oxidation reaction (PROX)

Laguna

Hernández

Arzamendi

et al. 2014

Fuel

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Hydrogen produced from the conversion of hydrocarbons or alcohols contains variable amounts of CO that should be removed for some applications such as feeding lowtemperature polymer electrolyte membrane fuel cells (PEMFCs). The CO preferential oxidation reaction (PROX) is particularly well-suited for hydrogen purification for portable and on-board applications. In this work, the synthesis and characterization by XRF, BET, XRD, Raman spectroscopy and H 2 -TPR of a gold catalyst supported on a copper-cerium mixed oxide (AuCeCu) for the PROX reaction are presented. The comparison of this catalyst with the copper-cerium mixed oxide (CeCu) revealed that the experimental procedure used for the deposition of gold gave rise to the loss of reducible material by copper lixiviation. However, the AuCeCu solid was more active for CO oxidation at low temperature. A kinetic study has been carried over the AuCeCu catalyst for the PROX reaction and compared with that of the CeCu catalyst. The main difference between the models affected the contribution of the CO adsorption term. This fact may be related to the surface electronic activity produced by the interaction of the cationic species in the AuCeCu solid, able to create more active sites for the CO adsorption and activation in the presence of gold.

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Section: Synthesis Of the Catalystsmentioning

confidence: 96%

Gold supported on CuOx/CeO2 catalyst for the purification of hydrogen by the CO preferential oxidation reaction (PROX)

Laguna

Hernández

Arzamendi

et al. 2014

Fuel

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“…Generally, excellent catalytic properties in the oxidation reactions [15,28,[129][130][131][132][133][134][135] and WGS reaction [136][137][138][139] can be obtained by combining gold with bare ceria or by using modified ceria oxides. Upon ceria modification, the enhancement of some structural properties has resulted in a relevant improvement of the catalytic activity.…”

Section: Characterization Of Au/ceo 2 Catalysts Involved In Oxidationmentioning

confidence: 99%

Au/CeO2 Catalysts: Structure and CO Oxidation Activity

et al. 2016

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Abstract:In this comprehensive review, the main aspects of using Au/CeO 2 catalysts in oxidation reactions are considered. The influence of the preparation methods and synthetic parameters, as well as the characteristics of the ceria support (presence of doping cations, oxygen vacancies concentration, surface area, redox properties, etc.) in the dispersion and chemical state of gold are revised. The proposed review provides a detailed analysis of the literature data concerning the state of the art and the applications of gold-ceria systems in oxidation reactions.

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“…Gold catalysts based on oxidemodified Al 2 O 3 supports include Au/MgO/Al 2 O 3 [189][190][191], Au/MnO x /Al 2 O 3 [192][193][194], Au/FeO x /Al 2 O 3 [192][193][194][195][196], Au/CoO x /Al 2 O 3 [192,194], Au/ZnO/Al 2 O 3 [192,197] [199], and Au/CeO 2 /Al 2 O 3 [200][201][202][203]. In particular, Nieuwenhuys and coworkers tested the performance of Al 2 O 3 -based gold catalysts in a number of reactions, and established that MgO/Al 2 O 3 [189], BaO/Al 2 O 3 [204,205], ZnO/Al 2 O 3 [197], and ZrO x /Al 2 O 3 [197] could all stabilize gold nanoparticles against thermal sintering.…”

Section: Pre-modification Of Al 2 O 3 Supportsmentioning

confidence: 99%

Development of novel supported gold catalysts: A materials perspective

2010

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Since Haruta et al. discovered that small gold nanoparticles finely dispersed on certain metal oxide supports can exhibit surprisingly high activity in CO oxidation below room temperature, heterogeneous catalysis by supported gold nanoparticles has attracted tremendous attention. The majority of publications deal with the preparation and characterization of conventional gold catalysts (e.g., Au/TiO 2 ), the use of gold catalysts in various catalytic reactions, as well as elucidation of the nature of the active sites and reaction mechanisms. In this overview, we highlight the development of novel supported gold catalysts from a materials perspective. Examples, mostly from those reported by our group, are given concerning the development of simple gold catalysts with single metal-support interfaces and heterostructured gold catalysts with complicated interfacial structures. Catalysts in the first category include active Au/SiO 2 and Au/metal phosphate catalysts, and those in the second category include catalysts prepared by pre-modification of supports before loading gold, by post-modification of supported gold catalysts, or by simultaneous dispersion of gold and an inorganic component onto a support. CO oxidation has generally been employed as a probe reaction to screen the activities of these catalysts. These novel gold catalysts not only provide possibilities for applied catalysis, but also furnish grounds for fundamental research.

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Gold supported CeO2/Al2O3 catalysts for CO oxidation: influence of the ceria phase

Cited by 94 publications

References 35 publications

Gold supported on CuOx/CeO2 catalyst for the purification of hydrogen by the CO preferential oxidation reaction (PROX)

Gold supported on CuOx/CeO2 catalyst for the purification of hydrogen by the CO preferential oxidation reaction (PROX)

Au/CeO2 Catalysts: Structure and CO Oxidation Activity

Development of novel supported gold catalysts: A materials perspective

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