Preferential CO oxidation promoted by the presence of H2over K–Pt/Al2O3

Minemura, Yuji; Ito, Shin Ichi; Miyao, Toshihiro; Naito, Shuichi; Tomishige, Keiichi; Kunimori, Kimio

doi:10.1039/b416565a

Cited by 70 publications

(57 citation statements)

References 15 publications

(10 reference statements)

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“…Although a number of catalysts more active for the PROX than the H 2 oxidation reaction have been reported [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19], CuOCeO 2 and supported Pt-based catalysts appear to be most promising [2,3]. The monometallic Pt catalyst usually showed noticeable activities only above 423 K [6].…”

Section: Introductionmentioning

confidence: 99%

“…The pretreatment of Pt catalyst with water vapor was reported to enhance low-temperature catalytic activities for the PROX by increasing Pt dispersion [7]. Several groups have reported that the PROX at low temperatures could be enhanced by the addition of 2nd metals such as Ce [8], Fe [9][10][11][12], Co [13][14][15][16], Ni [13], Mn [13], and alkali metals [17][18][19]. Even though each catalyst has proved its superiority by comparison with Pt catalyst, it is difficult to assess each catalyst because different reaction conditions have been adopted.…”

Section: Introductionmentioning

confidence: 99%

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Pt–Ni/γ-Al2O3 catalyst for the preferential CO oxidation in the hydrogen stream

Park

Seo

et al. 2006

Catal Lett

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The preferential CO oxidation (PROX) in the presence of excess hydrogen was studied over Pt-Ni/c-Al 2 O 3 . CO chemisorption, X-ray diffraction, transmission electron microscopy, energy dispersive X-ray spectroscopy and temperature-programmed reduction were conducted to characterize active catalysts. The co-impregnated Pt-Ni/c-Al 2 O 3 was superior to Pt/Ni/c-Al 2 O 3 and Ni/Pt/cAl 2 O 3 prepared by a sequential impregnation of each component on alumina support. The PROX activity was affected by the reductive pretreatment condition. The pre-reduction was essential for the low-temperature PROX activity. As the reduction temperature increased above 423 K, the CO 2 selectivity decreased and the atomic percent of Ni in the bimetallic phase of Pt-Ni increased. This catalyst exhibited the high CO conversion even in the presence of 2% H 2 O and 20% CO 2 over a wide reaction temperature. The bimetallic phase of Pt-Ni seems to give rise to high catalytic activity for the PROX in H 2 -rich stream.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pt–Ni/γ-Al2O3 catalyst for the preferential CO oxidation in the hydrogen stream

Park

Seo

et al. 2006

Catal Lett

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“…It was reported that when the atomic ratio of K/Pt = 10/1, the K−Pt/Al 2 O 3 was 20 times as active as that of Pt/Al 2 O 3 for the PROX reaction at 80°C and was able to decrease the CO concentration below 10 ppm in the range of 100−140°C. 158 Interestingly, it seems that the promotional effect of K is more pronounced on the inert-oxidesupported Pt catalysts than that on the reducible-oxidesupported ones. Tanaka et al 162 observed that K−Pt/Al 2 O 3 and K−Pt/SiO 2 exhibited a much higher CO conversion and CO 2 (Figure 3a).…”

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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“…Another way is to directly weaken the interaction between Pt and CO by the addition of alkali base metal species. [65][66][67] However, it is difficult to control the state and interaction of the components, while the improvement in catalytic performance is also limited. 25 Very recently, a Ru-Pt core-shell (Ru@Pt) structure has been designed.…”

Section: 61mentioning

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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Preferential CO oxidation promoted by the presence of H₂over K–Pt/Al₂O₃

Cited by 70 publications

References 15 publications

Pt–Ni/γ-Al2O3 catalyst for the preferential CO oxidation in the hydrogen stream

Pt–Ni/γ-Al2O3 catalyst for the preferential CO oxidation in the hydrogen stream

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

Green catalysis for selective CO oxidation in hydrogen for fuel cell

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