Catalytic performance and characterization of Au/doped-ceria catalysts for the preferential CO oxidation reaction

Avgouropoulos, George; Manzoli, Maela; Boccuzzi, F.; Tabakova, T.; Papavasiliou, Joan; Ioannides, Theophilos; Idakiev, V.

doi:10.1016/j.jcat.2008.03.014

Cited by 147 publications

(114 citation statements)

References 55 publications

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“…However, the presence of platinum nanoparticles was confirmed by EDS analysis. A similar observation was described in the literature for gold catalysts [26,27]. Small gold particles supported on ceria could not be detected by TEM due to the small contrast between the metal particle and the support.…”

Section: Catalyst Characterizationsupporting

confidence: 87%

Influence of the metal precursor on the catalytic behavior of Pt/Ceria catalysts in the preferential oxidation of CO in the presence of H2 (PROX)

Jardim

Rico-Francés

Coloma

et al. 2015

Journal of Colloid and Interface Science

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The effect of the metal precursor (presence or absence of chlorine) on the preferential oxidation of CO in the presence of H2 over Pt/CeO2 catalysts has been studied. The catalysts were prepared using (Pt(NH3)4)(NO3)2 and H2PtCl6, as precursors, in order to ascertain the effect of the chlorine species on the chemical properties of the support and on the catalytic behavior of these systems in the PROX reaction. The results show that chloride species exert an important effect on the redox properties of the oxide support due to surface chlorination. Consequently, the chlorinated catalyst exhibits a poorer catalytic activity at low temperatures compared with the chlorine-free catalyst, and this is accompanied by a higher selectivity to CO2 even at high reaction temperatures. It is proposed that the CO oxidation mechanism follows different pathways on each catalyst. This is a previous version of the article published in Journal of Colloid and Interface Science. 2015, 443: 45-55. doi:10.1016/j.jcis.2014 3: Graphical Abstract (for review)• The presence or absence of Cl in the Pt precursor strongly affects the catalytic behavior.• The Pt precursor affects the PROX mechanism at low reaction temperatures.• At 333 K, the mechanism in the Cl-free catalyst seems to involve the -OH groups on the support.• At higher temperatures, the reaction occurs via the same mechanism on both catalysts.. Highlights (for review) AbstractThe effect of the metal precursor (presence or absence of chlorine) on the preferential oxidation of CO in the presence of H 2 over Pt/CeO 2 catalysts has been studied. The catalysts are prepared using (Pt(NH 3 ) 4 )(NO 3 ) 2 and H 2 PtCl 6 , as precursors, in order to ascertain the effect of the chlorine species on the chemical properties of the support and on the catalytic behavior of these systems in the PROX reaction. The results show that chloride species exert an important effect on the redox properties of the oxide support due to surface chlorination. Consequently, the chlorinated catalyst exhibits a poorer catalytic activity at low temperatures compared with the chlorine-free catalyst, and this is accompanied by a higher selectivity to CO 2 even at high reaction temperatures. It is proposed that the CO oxidation mechanism follows different pathways on each catalyst.

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Section: Catalyst Characterizationsupporting

confidence: 87%

Influence of the metal precursor on the catalytic behavior of Pt/Ceria catalysts in the preferential oxidation of CO in the presence of H2 (PROX)

Jardim

Rico-Francés

Coloma

et al. 2015

Journal of Colloid and Interface Science

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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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“…The CO conversion rate goes down with higher temperatures still due to the enhancement of H 2 oxidation with temperature, which was also observed by other researchers. [31][32][33][34] Ru/P-CNTs exhibits a higher CO conversion rate than that over Ru/COX and Ru/AOX at reaction temperature above 125 uC. CO 2 selectivity follows a similar trend as that of CO conversion.…”

Section: Metal-support Interactionmentioning

confidence: 77%

Difference in the cooperative interaction between carbon nanotubes and Ru particles loaded on their internal/external surface

Wang

Chen

et al. 2013

RSC Adv.

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This paper examines differences in the cooperative interaction between carbon nanotubes (CNTs) and Ru particles loaded on their internal/external surface. The techniques used were transmission electron microscopy, X-ray photoelectron spectroscopy, CO chemisorption, X-ray diffraction, N 2 physisorption, hydrogen temperature-programmed reduction and two probe catalysis reactions, namely ammonia decomposition and preferential oxidation of CO in H 2 -rich atmosphere (PROX). The results show that the loading of highly dispersed Ru particles on CNTs does not change the structure of the CNTs. The cooperative interaction between Ru particles and associated CNT surfaces is dependent on the position of Ru particles and the surface functional groups of CNTs. Due to the electron-deficient structure of Ru particles confined inside CNT channels, they have an inferior ammonia decomposition activity to those deposited on the CNT external surface. For PROX, the catalytic performance of Ru particles confined inside CNT channels is superior compared to that over Ru particles deposited outside CNTs, which we attribute to the selective reactant enrichment of CO over H 2 inside the CNTs.

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Catalytic performance and characterization of Au/doped-ceria catalysts for the preferential CO oxidation reaction

Cited by 147 publications

References 55 publications

Influence of the metal precursor on the catalytic behavior of Pt/Ceria catalysts in the preferential oxidation of CO in the presence of H2 (PROX)

Influence of the metal precursor on the catalytic behavior of Pt/Ceria catalysts in the preferential oxidation of CO in the presence of H2 (PROX)

Au/CeO2 Catalysts: Structure and CO Oxidation Activity

Difference in the cooperative interaction between carbon nanotubes and Ru particles loaded on their internal/external surface

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