Selective oxidation of CO over model gold-based catalysts in the presence of H

Rossignol, Cécile; Arrii, Sandrine; Morfin, F.; Piccolo, L.; Caps, Valérie; Rousset, J.L.

doi:10.1016/j.jcat.2005.01.011

Cited by 156 publications

(111 citation statements)

References 32 publications

Supporting

Mentioning

100

Contrasting

Unclassified

Order By: Relevance

“…Temperature variation of CO formation due to CO 2 Reverse Water Gas Shift reaction, in the presence of H 2 , over the same Au/␥-Al 2 O 3 catalyst, measured under non-continuous feeding conditions, by RF-GC perimeter of the Au nanoparticle with oxygen bound to the support (26). Hydrogen adsorption on gold, partly blocked at low temperatures by CO, explains the high activity and satisfactory selectivity towards CO 2 formation.…”

Section: Figurementioning

confidence: 85%

“…Rossignol et al (26), suggest for the effect of hydrogen that beneficial effects of hydrogen on the CO oxidation reaction are mostly related to the prevention of deactivation and regeneration. In the presence of H 2 , two phenomena should occur simultaneously.…”

Section: Figurementioning

confidence: 99%

“…In addition, H 2 dissociation has been reported on Au/Al 2 O 3 (26). The adsorbed H atoms can also affect neighbour gold atoms in such a way that they can facilitate the activation of oxygen molecules (e.g.…”

Section: Figurementioning

confidence: 99%

See 2 more Smart Citations

On the mechanism of selective CO oxidation on nanosized Auγ-Al2O3 catalysts

et al. 2006

View full text Add to dashboard Cite

Nanometer-sized gold particles on oxide supports are efficient catalysts for the selective catalytic oxidation (SCO) of carbon monoxide under conditions compatible with the operation of PEM fuel cells. Nanosized Au/␥-Al 2 O 3 catalysts are able to oxidize CO between 20 and 70°C in an atmosphere of hydrogen combining high CO conversion and satisfactory selectivity to CO 2 (1). It is generally agreed that the catalytic activity of gold depends on the size of the gold particles, but the nature of support material, the preparation method, the activation procedure have also been suggested to play a key role (2). Sites at the gold support interface have also been claimed to be responsible for the activity in CO oxidation (3). Strain in the Au particles due to the mismatch of the lattices at the interface with the support (4) and the effect of low-coordinated sites and roughness (4) have also been suggested as important factors for high activity. The most important effect, concerning the catalytic activity of gold nanoparticles for low temperature oxidation of CO is related to the availability of many low-coordinated gold atoms on the small particles (5). Effects related to the interaction with the support may also contribute, but to a considerably smaller extent (5).CO oxidation over group VIII noble metals is the most studied catalytic reaction. However, selective oxidation of CO in hydrogen-rich conditions is not as well studied (6,7). CO (reactant) and CO 2 (product) sorption processes are fundamental elementary steps for SCO and moreover, the effect of hydrogen on their sorption over supported Au catalysts remains a subject of significant interest.Among the various supported Au catalysts, Au/Al 2 O 3 is perhaps one that has shown the widest variation for CO oxidation, ranging from being very inactive to practically as active as Au/TiO 2 (8). Compared to Au/␥-Al 2 O 3 , multicomponent gold-based catalysts also supported on ␥-Al 2 O 3 and combined with common metal oxides, such as: MnO x , MgO, FeO x (9,10) as well as gold catalysts supported on other materials such as Au/TiO 2 (11) and Au/FeO x (11,12) have been found to exhibit even more promising commercial performance for the SCO reaction. However, based on its simplicity, a well-studied Au/␥-Al 2 O 3 catalyst (1,9) has been utilized in the present work as model system, in order to gain fundamental information on the catalytic behaviour of gold nanoparticles and identify the active sites on Au/␥-Al 2 O 3 .In this paper, new findings which offer further information concerning the mechanism of CO preferential oxidation over nanosized Au are presented. The first finding concerns CO 2 formation in the absence of oxygen and hydrogen both in bare ␥-Al 2 O 3 as well as in Au/␥-Al 2 O 3 (called as CO decomposition). At high temperatures (>200 °C) in excess of H 2 , over the Au/␥-Al 2 O 3 catalyst, reversed water gas shift (RWGS) reaction results in CO 2 consumption towards CO and H 2 O formation. Finally, the kinetic measurements of the present work indicate that hydrog...

show abstract

Section: Figurementioning

confidence: 85%

Section: Figurementioning

confidence: 99%

See 1 more Smart Citation

On the mechanism of selective CO oxidation on nanosized Auγ-Al2O3 catalysts

et al. 2006

View full text Add to dashboard Cite

show abstract

“…The k is a function of temperature and can be represented by Arrhenius in Equation (5). Taking natural log on both sides of the above equation, we get Equation (5) of straight line.…”

Section: Effect Of the Space Velocitymentioning

confidence: 99%

“…Huge literature has been accumulated on the catalyst development. The catalysts used are noble metal catalysts [1,2], gold based catalysts [3][4][5], Transition base metal catalysts [6,7] and provoskites. Due to urbanisation there is a rapid growth of vehicles around the globe and hence the air pollution associated with it.…”

Section: Introductionmentioning

confidence: 99%

Total Oxidation of CO Using Cu & Co Catalyst: Kinetic Study and Calcinations Effect

Rattan

Kaur

2015

Bull. Chem. React. Eng. Catal.

View full text Add to dashboard Cite

The present study deals with the oxidation of CO using base metal catalysts. A series of copper cobalt with different mole ratios were prepared by wet-impregnation method calcined at 400 o C for 3 h for the oxidation of CO. The mole ratios were varied from 1:1 to 1:5 by varying the weight of nitrates accordingly. It was found that 1:3 and 1:4 are active catalyst among the other prepared catalysts. Further, the two catalysts (1:3 & 1:4) were prepared by co-precipitation and citric sol-gel methods in order to see the effect of preparation method. The results showed that the catalyst prepared by co-precipitation method is good in terms of activity for CO oxidation. The best selected catalyst was characterized by TGA/DSC and XRD. Kinetic study was also performed on the selected catalyst.

show abstract

Mössbauer Spectroscopic Investigations of Novel Bimetal Catalysts for Preferential CO Oxidation In H ₂

Zhang

Wang

et al. 2013

Mössbauer Spectroscopy

View full text Add to dashboard Cite

Selective oxidation of CO over model gold-based catalysts in the presence of H

Cited by 156 publications

References 32 publications

On the mechanism of selective CO oxidation on nanosized Auγ-Al2O3 catalysts

On the mechanism of selective CO oxidation on nanosized Auγ-Al2O3 catalysts

Total Oxidation of CO Using Cu & Co Catalyst: Kinetic Study and Calcinations Effect

Mössbauer Spectroscopic Investigations of Novel Bimetal Catalysts for Preferential CO Oxidation In H ₂

Contact Info

Product

Resources

About

Selective oxidation of CO over model gold-based catalysts in the presence of H

Cited by 156 publications

References 32 publications

On the mechanism of selective CO oxidation on nanosized Auγ-Al2O3 catalysts

On the mechanism of selective CO oxidation on nanosized Auγ-Al2O3 catalysts

Total Oxidation of CO Using Cu & Co Catalyst: Kinetic Study and Calcinations Effect

Mössbauer Spectroscopic Investigations of Novel Bimetal Catalysts for Preferential CO Oxidation In H 2

Contact Info

Product

Resources

About

Mössbauer Spectroscopic Investigations of Novel Bimetal Catalysts for Preferential CO Oxidation In H ₂