Pt3Co and PtCu intermetallic compounds: Promising catalysts for preferential oxidation of CO in excess hydrogen

Komatsu, Takayuki; Tamura, Asako

doi:10.1016/j.jcat.2008.06.030

Cited by 138 publications

(90 citation statements)

References 29 publications

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“…Furthermore, the presence of hydrogen was found to promote the rate of CO oxidation. 130 135 The Pt 3 Co catalyst was more selective than PtCu for CO 2 formation. Characterizations suggested that the formation of IMCs induced elongation of the Pt−Pt bond distance and electron transfer from Pt to Co or Cu; both effects weakened CO adsorption and therefore increased the low-temperature activity.…”

Section: Promoted Pgm Catalysts For the Proxmentioning

confidence: 99%

Recent Advances in Preferential Oxidation of CO Reaction over Platinum Group Metal Catalysts

2012

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Preferential oxidation of CO (PROX) is an important reaction for removing small amounts of CO to a parts-per-million level from the hydrogen-rich stream, which will be ultimately supplied as a fuel to polymer−electrolyte membrane fuel cells. The key to the application of PROX is to develop a highly active and selective catalyst that operates well in a wide temperature window (e.g., 80−180°C) and has good resistance to CO 2 and steam. In the past decades, various catalyst formulations have been developed, among which platinum group metal catalysts, including Pt, Ru, and Irin particular, those modified with promoters such as alkali metals and reducible metal oxideshave received a great deal of attention for their significantly improved catalytic activities in the low-temperature range. In this minireview, the recent advances of the platinum group metal catalysts for the PROX reaction are summarized, including performances of unpromoted and promoted catalysts, reaction mechanisms, and kinetics. In addition, the important roles of hydroxyl groups in the PROX reaction are also discussed.

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Section: Promoted Pgm Catalysts For the Proxmentioning

confidence: 99%

Recent Advances in Preferential Oxidation of CO Reaction over Platinum Group Metal Catalysts

2012

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“…Thus, catalyst Pt 3 Co/ SiO 2 [8] exhibited greater activity than Pt/SiO 2 for the PROX of CO and was stable under the stated reaction conditions up to 473 K. Yan et al [9] showed that the addition of Co to Pt/c-Al 2 O 3 could not only improve the low-temperature activity but also reduce significantly the loading of Pt in the catalyst. Moreover, presence of cobalt increased the resistance to H 2 O and CO 2 of the platinum catalyst.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cobalt on the Activity of CuO/CeO2 Catalyst for the Selective Oxidation of CO

et al. 2010

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In this work effect of cobalt on catalyst CuO/ CeO 2 activity in selective CO oxidation in H 2 -containing gases mixture was investigated. Catalysts were prepared by wet impregnation and calcination at 673 K, characterized by ICP, H 2 -TPR, XRD, TEM, BET and XPS. The addition of cobalt to Cu/CeO 2 catalyst improved the catalytic activity and selectivity for CO oxidation. Discussion of the results showed that the synergistic effect is correlated to better dispersion and reducibility of copper in the presence of the cobalt metal additive. More precisely, cobalt enhanced the segregation of copper phase towards the catalyst surface and copper enhanced CO oxidation at the expense of H 2 combustion.

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“…11) and found that Pt 3 Co/SiO 2 and PtCu/SiO 2 were much more active than Pt/SiO 2 especially at low temperatures. 28) These IMCs were stable under the PROX conditions without the formation of bulk oxides regardless of the presence of oxygen in the feed. As shown in Fig.…”

Section: Oxidationmentioning

confidence: 91%

Intermetallic Compound Nanoparticles Dispersed on the Surface of Oxide Support as Active and Selective Catalysts

Komatsu

Furukawa

2015

Mater. Trans.

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Preparation of nanoparticles of intermetallic compounds and their application to various catalytic reactions are summarized. On the surface of silica support, single-phase nanoparticles of intermetallics with various combinations of elements were obtained by co-impregnation and/or successive impregnation procedures. On alumina support, its strong interaction with metal species requires another preparation procedure, liquidphase reduction, to obtain intermetallic nanoparticles with high phase purity. Most of the particles formed on both supports had diameters of 3³20 nm. Thus prepared intermetallic nanoparticles were used as catalysts for various reactions such as H 2 -D 2 equilibration, selective hydrogenation, dehydrogenation, oxidation and isomerization. The catalytic activity and selectivity of nanoparticles differed from each other depending on the combination and composition of two elements. In some cases, the intermetallic catalysts gave much higher activity and/or selectivity than their component monometallic catalysts. The unique catalytic properties of intermetallic compounds were discussed in terms of the electronic and geometric factors compared with pure metals.

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Pt3Co and PtCu intermetallic compounds: Promising catalysts for preferential oxidation of CO in excess hydrogen

Cited by 138 publications

References 29 publications

Recent Advances in Preferential Oxidation of CO Reaction over Platinum Group Metal Catalysts

Recent Advances in Preferential Oxidation of CO Reaction over Platinum Group Metal Catalysts

Effect of Cobalt on the Activity of CuO/CeO2 Catalyst for the Selective Oxidation of CO

Intermetallic Compound Nanoparticles Dispersed on the Surface of Oxide Support as Active and Selective Catalysts

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