Supported base metal catalysts for the preferential oxidation of carbon monoxide in the presence of excess hydrogen (PROX)

Mariño, Fernando; Descorme, C.; Duprez, Daniel

doi:10.1016/j.apcatb.2004.12.008

Cited by 229 publications

(118 citation statements)

References 45 publications

(43 reference statements)

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“…It must be kept in mind that ceria can act as an oxygen buffer. As a result, the oxygen concentration over the catalyst would be virtually constant up to a certain oxygen inlet concentration, when the maximum oxygen storage capacity (OSC) of ceria is exceeded [11]. This result is in agreement with the values reported in the literature [10,13,24,36,53] which show a similar dependence of the CO oxidation reaction with the λ value.…”

Section: Co Prox: Effect Of Feed Compositionsupporting

confidence: 90%

“…However, the effect of CO 2 present in the reaction feed cannot be ruled out as being responsible for the loss in catalytic activity. Mariño et al [11] proposed the formation of carbonates due to CO 2 adsorption on the ceria support as responsible for the observed behavior in the catalytic activity.…”

Section: Co Prox: Effect Of Reaction and Reduction Temperaturementioning

confidence: 98%

“…Details regarding the possible mechanisms are reported later. Both catalysts exhibited a decrease in CO conversion and selectivity to CO 2 (not shown) at temperatures above 400 K. At these high temperatures, the oxidation of H 2 to H 2 O was more favored than the oxidation of CO to CO 2 [11,24,25,47]. However, the effect of CO 2 present in the reaction feed cannot be ruled out as being responsible for the loss in catalytic activity.…”

Section: Co Prox: Effect Of Reaction and Reduction Temperaturementioning

confidence: 99%

“…Several mechanisms have been proposed in the literature for the PROX reaction, which may depend on the choice of catalyst support. Mariño et al [10,11] have shown that the CO oxidation mechanism over non-active supports occurs via a competitive LangmuirHinshelwood mechanism, where CO and O 2 are adsorbed on the same adsorption sites.…”

Section: Introductionmentioning

confidence: 99%

“…However, when a reducible metal oxide is used as a support, the oxygen anion functionalities of the support participate in the reaction, via a Mars-Krevelen mechanism [10][11][12]. Pozdnyakova et al [13] suggested that the reaction mechanism in Pt/CeO 2 catalysts involves -OH groups on the surface.…”

Section: Introductionmentioning

confidence: 99%

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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: Co Prox: Effect Of Feed Compositionsupporting

confidence: 90%

Section: Co Prox: Effect Of Reaction and Reduction Temperaturementioning

confidence: 98%

Section: Co Prox: Effect Of Reaction and Reduction Temperaturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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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Recent Trends in the Development of Proton Exchange Membrane Fuel Cell Systems

Arpornwichanop¹,

Authayanun²

2016

Alternative Energy and Shale Gas Encyclopedia

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Effect of supercritical deposition synthesis on dibenzothiophene hydrodesulfurization over NiMo/Al₂O₃ nanocatalyst

Alibouri

Ghoreishi

Aghabozorg³

2009

AIChE Journal

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in Wiley InterScience (www.interscience.wiley.com).The synthesis of two NiMo/Al 2 O 3 catalysts by the supercritical carbon dioxide/methanol deposition (NiMo-SCF) and the conventional method of wet coimpregnation (NiMo-IMP) were conducted. The results of the physical and chemical characterization techniques (adsorption-desorption of nitrogen, oxygen chemisorption, XRD, TPR, TEM, and EDAX) for the NiMo-SCF and NiMo-IMP demonstrated high and uniform dispersed deposition of Ni and Mo on the Al 2 O 3 support for the newly developed catalyst. The hydrodesulfurization (HDS) of fuel model compound, dibenzothiophene, was used in the evaluation of the NiMo-SCF catalyst vs. the commercial catalyst (NiMo-COM). Higher conversion for the NiMo-SCF catalyst was obtained. The kinetic analysis of the reaction data was carried out to calculate the reaction rate constant of the synthesized and commercial catalysts in the temperature rang of 543-603 K. Analysis of the experimental data using Arrhenius' law resulted in the calculation of frequency factor and activation energy of the HDS for the two catalysts. V

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Supported base metal catalysts for the preferential oxidation of carbon monoxide in the presence of excess hydrogen (PROX)

Cited by 229 publications

References 45 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)

Recent Trends in the Development of Proton Exchange Membrane Fuel Cell Systems

Effect of supercritical deposition synthesis on dibenzothiophene hydrodesulfurization over NiMo/Al₂O₃ nanocatalyst

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Supported base metal catalysts for the preferential oxidation of carbon monoxide in the presence of excess hydrogen (PROX)

Cited by 229 publications

References 45 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)

Recent Trends in the Development of Proton Exchange Membrane Fuel Cell Systems

Effect of supercritical deposition synthesis on dibenzothiophene hydrodesulfurization over NiMo/Al2O3 nanocatalyst

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Product

Resources

About

Effect of supercritical deposition synthesis on dibenzothiophene hydrodesulfurization over NiMo/Al₂O₃ nanocatalyst