Purifying Hydrogen by Selective Oxidation of Carbon Monoxide

Brown, Marion; Green, Albert; Cohn, Gunther; Andersen, Holger C.

doi:10.1021/ie50610a025

Cited by 55 publications

(23 citation statements)

References 1 publication

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“…Results reported in the literature show that CO can be oxidized in preference to hydrogen in the temperature range of 100-200 • C over Al 2 O 3 supported Ru, Rh, and Pt catalysts [28][29][30][31]. The interesting observation is that CO oxidation is enhanced by the presence of hydrogen.…”

Section: Selective Oxidation Of Co In the Presence Of Hydrogenmentioning

confidence: 91%

The beneficial effect of the addition of base metal oxides to gold catalysts on reactions relevant to air pollution abatement

2004

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Section: Selective Oxidation Of Co In the Presence Of Hydrogenmentioning

confidence: 91%

The beneficial effect of the addition of base metal oxides to gold catalysts on reactions relevant to air pollution abatement

2004

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“…In CO PROX, the catalytic mechanism is generally explained on the basis of a Mars and Van Krevelen redoxtype mechanism, in which the redox changes can occur in both the copper oxide and ceria components [5][6][7][8][9][10][11][12][13][14][15][16][17]. The performances of this type of catalysts for the CO selective oxidation is thus attributed to the synergistic redox properties produced by the formation of copper oxide ceria interfacial sites [60,72,87].…”

Section: Hypotheses On the Active Sites Of Copper-ceria Catalystsmentioning

confidence: 99%

“…The main studied noble metals are platinum, palladium, ruthenium and rhodium, supported on alumina or silica or on other supports such as zeolites or those based on ceria. Except the pioneer paper of Brown et al [5], papers on selective CO oxidation on noble metals really appeared in the 1990s. Oh and Sinkevitch [6] compared the catalytic performances of Pt, Pd, Rh and Ru supported on alumina.…”

Section: Introductionmentioning

confidence: 99%

Preferential Oxidation of Carbon Monoxide in the Presence of Hydrogen (PROX) over Noble Metals and Transition Metal Oxides: Advantages and Drawbacks

et al. 2008

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The steam reforming reaction of hydrocarbons and organic fuels, in general, is followed by a two-stage reaction of water gas shift, which allows increasing the hydrogen yield and a final purification step for CO removal to use hydrogen in an ammonia plant or a PEM fuel cell. This paper is focused on the CO Preferential Oxidation, CO PROX (or CO selective oxidation in excess hydrogen) reaction, considered as the simplest and cost effective process to achieve the less than 10 ppm CO. The objective of this paper is to review the performances of noble metals (Pt, Ru, Rh, Pd), gold and transition metal oxides catalysts in this reaction. Although the results reported are largely influenced by the experimental conditions (reactant flow composition, mass of catalyst, duration of experiment …) a comparison of advantages and drawbacks for each type of catalysts is proposed in terms of activity and selectivity as well as of CO 2 and H 2 O influences. A special attention will be paid to copper-doped ceria catalysts which appear to be very active and selective in a range of temperatures appropriate for fuel cell application. The performances, the stability and the low cost of these formulations compared to noble metal-based catalysts make them very attractive for an industrial application.

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“…Noble metal catalysts supported on some oxides [4] or carbon [5] have been reported for that purpose so far. We have proposed Pt catalysts supported on zeolites for the removal of 1% CO from H 2 -rich gas by the PROX, taking advantage of its ''chemical and molecular sieve effect'' [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

XAFS Characterization of Pt–Fe/zeolite Catalysts for Preferential Oxidation of CO in Hydrogen Fuel Gases

et al. 2005

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We have developed a new Pt-Fe/mordenite (Pt-Fe/M) catalyst which shows remarkably high activity and selectivity for the oxidation of CO in H 2 -rich gas compared with Pt/M. In the present work, to understand the role and structure of Pt and Fe in the Pt-Fe/M catalyst, the states of metallic components in ion-exchanged, H 2 pre-treated and post-PROX (preferential oxidation of CO) samples have been studied by means of XAFS. It was confirmed that Pt forms the metallic clusters after H 2 pretreatment or the PROX experiment, whereas a large part of Fe exists as oxides even after the H 2 treatment. At post-analysis of the catalysts used for the PROX experiment, an increase in coordination number of Fe-O was observed. Pt clusters in the Pt-Fe(2:1 weight ratio)/M catalyst, which showed the highest PROX performance, were found to have a different electronic structure from the other catalysts. Additionally, preferential CO adsorption onto Pt sites at Pt-Fe/M was clearly demonstrated by infrared spectroscopy analysis in a stream of 1% CO containing H 2 . Based on these results, the superior PROX mechanism was discussed.

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Purifying Hydrogen by Selective Oxidation of Carbon Monoxide

Cited by 55 publications

References 1 publication

The beneficial effect of the addition of base metal oxides to gold catalysts on reactions relevant to air pollution abatement

The beneficial effect of the addition of base metal oxides to gold catalysts on reactions relevant to air pollution abatement

Preferential Oxidation of Carbon Monoxide in the Presence of Hydrogen (PROX) over Noble Metals and Transition Metal Oxides: Advantages and Drawbacks

XAFS Characterization of Pt–Fe/zeolite Catalysts for Preferential Oxidation of CO in Hydrogen Fuel Gases

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