Mechanisms of CO oxidation reaction and effect of chlorine ions on the CO oxidation reaction over Pt/CeO2 and Pt/CeO2/γ-Al2O3 catalysts

Oran, Umut; Üner, Deniz

doi:10.1016/j.apcatb.2004.06.011

Cited by 68 publications

(47 citation statements)

References 31 publications

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“…As the temperature above 75°C, the CO 2 (2349 cm )1 ) intensity significantly increases and the carbonates intensity decreases. This indicates that the activity of 5Co/ Si C400 sample comes from the adsorbed CO and lattice oxygen of cobalt oxide, and part of CO 2 formation via carbonates as equations (1) and (2). The consumed lattice oxygen (*-O L ) may be restored through adsorption of oxygen molecules on the resulted vacancy (* L ).…”

Section: ãàCarbonate ðIþ ! Co 2 þ ã ðIþ ð4þmentioning

confidence: 99%

“…Excepting the carbonates formation, the CO adsorbed on 5Co/Si C400 sample ( figure 8(a)) to promote the CO oxidation. The activity comes from the adsorbed CO and lattice oxygen of cobalt oxide, and part of CO 2 formation via carbonates as equations (1) and (2). Both types of carbonates are formed on 5Co/Al C400 sample ( figure 8(b)) to promote the CO oxidation.…”

Section: ãàCarbonate ðIþ ! Co 2 þ ã ðIþ ð4þmentioning

confidence: 99%

“…There are several reports describing the use of noble metals (Pt, Pd) for CO oxidation [1][2][3][4][5][6][7]. However, the high cost of noble metals and their sensitivity to sulfur poisoning have stimulated the search for substitute catalysts.…”

Section: Introductionmentioning

confidence: 99%

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In situ FT-IR Spectroscopic Studies on the Mechanism of the Catalytic Oxidation of Carbon Monoxide over Supported Cobalt Catalysts

et al. 2006

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Three types of supported cobalt catalysts (5% as metal Co loading on SiO 2 , Al 2 O 3 and TiO 2 ) were prepared by incipient wetness impregnation with aqueous Co(NO 3 ) 2 AE 6H 2 O solution. Then, all catalysts were calcined in air at 400°C (assigned as 5Co/Si C400, 5Co/Al C400 and 5Co/Ti C400). Their catalytic activities towards the CO oxidation were studied in a continuous flow microreactor. Adsorption of carbon monoxide (CO) and the co-adsorption of CO/O 2 over cobalt oxide were further tested under in situ FT-IR. The results showed that both 5Co/Si C400 and 5Co/Al C400 had higher activity than 5Co/Ti C400. The T 50 (50% conversion) for both 5Co/Si C400 and 5Co/Al C400 was reached at temperatures as low as ambient temperature. According to the in situ FT-IR analysis, the variation in oxidation of CO was interpreted with different mechanisms, i.e., the reaction between adsorbed CO and lattice oxygen of cobalt oxide, and part of CO 2 formation via carbonates on 5Co/Si C400; both types of carbonates are formed on 5Co/Al C400 to promote the CO oxidation; while both strong adsorption of CO on TiO 2 and CO 2 on cobalt oxide for 5Co/Ti C400 leads to affect the activity.

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Section: ãàCarbonate ðIþ ! Co 2 þ ã ðIþ ð4þmentioning

confidence: 99%

Section: ãàCarbonate ðIþ ! Co 2 þ ã ðIþ ð4þmentioning

confidence: 99%

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In situ FT-IR Spectroscopic Studies on the Mechanism of the Catalytic Oxidation of Carbon Monoxide over Supported Cobalt Catalysts

et al. 2006

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“…48 Besides improved O 2 activation capability, such intimate interaction can also suppress the CO adsorption on Pt as characterized by chemisorption and DRIFT-IR results. 42,44,48 Furthermore, the effect of Fe 40 promoter also depends on the type of support. The Fe promoted Pt/Al 2 O 3 catalysts do not exhibit such high activity and selectivity at low temperature.…”

Section: Introductionmentioning

confidence: 99%

“…1,6,7 Therefore, the delivery of clean H 2 to Pt anodes becomes the essential and imminent requirement for the application of PEFC. 40 However, the complete reduction of CO cannot be accomplished by the WGS process due to the limitation in thermodynamic equilibrium.…”

Section: Introductionmentioning

confidence: 99%

Green catalysis for selective CO oxidation in hydrogen for fuel cell

Huang

Hara

Fukuoka

2009

Energy Environ. Sci.

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5Preferential oxidation of carbon monoxide in excess hydrogen (PROX) is one of the key processes for the production of clean hydrogen fuel for the polymer electrolyte membrane fuel cell (PEFC). Development of highly active and selective catalysts is among the most challenging works for decades. Platinum-based catalysts are regarded as the most promising candidates for this process. However, the activities of Pt catalysts seriously suffer from the strong poisonous adsorption by CO 10 substrate at low reaction temperature. This article addresses the present approaches to improve the catalytic performance under the low temperature. The focus in this article is the finding over the Pt/mesoporous silica catalyst. The high activity and selectivity of this catalyst has been attributed to the surface silanols in mesoporous silica. The perspectives of Pt/mesoporous silica in the PROX reaction are also presented.

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Ionic Liquid‐Mediated α‐Fe₂O₃ Shape‐Controlled Nanocrystal‐Supported Noble Metals: Highly Active Materials for CO Oxidation

et al. 2013

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Shape‐controlled iron oxide nanocrystals were prepared by using an ionic liquid‐mediated hydrothermal process. Different morphologies can be synthesised, such as cubes and porous nanotubes. Owing to the different morphologies developed, accessible surface area varies from a few m2 g−1 to more than 50 m2 g−1. These differences result in different oxygen mobilities, and the porous nanorods demonstrate the highest bulk oxygen mobility. Thus, all these shaped materials demonstrate higher activity for the oxidation reaction compared to the commercial reference. In addition, the favourable physical properties, that is high surface area, enable the easy dispersion of noble metal nanoparticles (platinum, palladium and gold); some of these high‐surface area noble metal‐containing materials demonstrate remarkable catalytic activities. Porous nanorod‐supported gold nanoparticles enable the conversion of CO below 100 °C, which is far better than on commercial α‐Fe2O3‐supported gold for which dispersion of gold remains difficult owing to the low surface area of the commercial support.

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Mechanisms of CO oxidation reaction and effect of chlorine ions on the CO oxidation reaction over Pt/CeO2 and Pt/CeO2/γ-Al2O3 catalysts

Cited by 68 publications

References 31 publications

In situ FT-IR Spectroscopic Studies on the Mechanism of the Catalytic Oxidation of Carbon Monoxide over Supported Cobalt Catalysts

In situ FT-IR Spectroscopic Studies on the Mechanism of the Catalytic Oxidation of Carbon Monoxide over Supported Cobalt Catalysts

Green catalysis for selective CO oxidation in hydrogen for fuel cell

Ionic Liquid‐Mediated α‐Fe₂O₃ Shape‐Controlled Nanocrystal‐Supported Noble Metals: Highly Active Materials for CO Oxidation

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Mechanisms of CO oxidation reaction and effect of chlorine ions on the CO oxidation reaction over Pt/CeO2 and Pt/CeO2/γ-Al2O3 catalysts

Cited by 68 publications

References 31 publications

In situ FT-IR Spectroscopic Studies on the Mechanism of the Catalytic Oxidation of Carbon Monoxide over Supported Cobalt Catalysts

In situ FT-IR Spectroscopic Studies on the Mechanism of the Catalytic Oxidation of Carbon Monoxide over Supported Cobalt Catalysts

Green catalysis for selective CO oxidation in hydrogen for fuel cell

Ionic Liquid‐Mediated α‐Fe2O3 Shape‐Controlled Nanocrystal‐Supported Noble Metals: Highly Active Materials for CO Oxidation

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Ionic Liquid‐Mediated α‐Fe₂O₃ Shape‐Controlled Nanocrystal‐Supported Noble Metals: Highly Active Materials for CO Oxidation