Removal of carbon monoxide from hydrogen-rich fuels by selective oxidation over platinum catalyst supported on zeolite

Igarashi, Hiroshi; Uchida, Hiroyuki; Suzuki, Miki; Sasaki, Yuko; Watanabe, Masahiro

doi:10.1016/s0926-860x(97)00075-6

Cited by 259 publications

(114 citation statements)

References 6 publications

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“…The most promising selective CO oxidation catalysts are based on Pt-group metals. [263][264][265][266] Although an intense development effort is being put into automobile fuel cell technology, a unit constructed using current generation technologies in all components is still far from meeting industrial performance and cost targets. The size, weight, and cost of the unit must be reduced substantially, and durability must be enhanced to meet the 10 000 h lifetime goal, with operation that includes many cycles of start-up and shut-down.…”

Section: Fuel-cell Powered Vehicles: Introduction and Current Statusmentioning

confidence: 99%

Catalysis Research of Relevance to Carbon Management: Progress, Challenges, and Opportunities

et al. 2001

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Section: Fuel-cell Powered Vehicles: Introduction and Current Statusmentioning

confidence: 99%

Catalysis Research of Relevance to Carbon Management: Progress, Challenges, and Opportunities

et al. 2001

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“…Watanabe and co-workers investigated the PROX reaction on zeolite-supported Pt catalysts [62,63]. Preliminary studies [62] on Pt/A-zeolite catalyst showed extremely promising results; an order of magnitude higher CO oxidation selectivity (as compared to Pt/Al 2 O 3 ) was obtained at similar conversion levels.…”

Section: Preferential Oxidation Of Co (Prox)mentioning

confidence: 99%

“…Preliminary studies [62] on Pt/A-zeolite catalyst showed extremely promising results; an order of magnitude higher CO oxidation selectivity (as compared to Pt/Al 2 O 3 ) was obtained at similar conversion levels. Subsequent studies [63] involving a series of catalysts (Pt/A, Pt/modernite, Pt/X, Pt/Al 2 O 3 ) showed that the Pt/modernite catalyst required the least amount of excess oxygen for the complete conversion of CO (1%) in presence of excess of hydrogen. Use of a two-stage reactor further increased the effectiveness of the Pt/modernite catalyst.…”

Section: Preferential Oxidation Of Co (Prox)mentioning

confidence: 99%

CO-free fuel processing for fuel cell applications

2003

Fuel and Energy Abstracts

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In view of the stringent CO intolerance of the state-of-the-art proton exchange membrane (PEM) fuel cells, it is desirable to explore CO-free fuel processing alternatives. In recent years, step-wise reforming of hydrocarbons has been proposed for production of CO-free hydrogen for fuel cell applications. The decomposition of hydrocarbons (first step of the step-wise reforming process) has been extensively investigated. Both steam and air have been employed for catalyst regeneration in the second step of the process. Since, PEM is poisoned by very low (ppm) levels of CO, it is essential to eliminate even trace amounts of CO from the reformate stream. Preferential oxidation of CO (PROX) is considered to be a promising method for trace CO clean up. Related studies along with a discussion of catalytic ammonia decomposition (for applications in alkaline fuel cells) will be included in this review.

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“…In 1997, Igarashi et al investigated the effect of the support on the selectivity of Pt catalysts for CO oxidation and found that Pt supported on mordenite showed the highest selectivity, as well as high conversion of CO during oxidation at low oxygen concentration [13]. In the same year, Kahlich et al [14] used the preferential oxidation process (PROX) to determine the optimum temperature, the reaction order, and the apparent activation energy of CO oxidation on Pt/Al 2 O 3 .…”

Section: Literature Reviewmentioning

confidence: 99%

“…Because of the exothermic nature of these two oxidation reactions, some commercial designs for this element of the fuel processor are based on two adiabatic reactors in series, with an intermediate cooling step [13].…”

Section: Introduction 11 Preferential Oxidationmentioning

confidence: 99%

Reformulation of Coal-Derived Transportation Fuels: Selective Oxidation of Carbon Monoxide on Metal Foam Catalysts

Chin¹,

Sun²,

Roberts³

et al. 2002

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Several different catalytic reactions must be carried out in order to convert hydrocarbons (or alcohols) into hydrogen for use as a fuel for polyelectrolyte membrane (PEM) fuel cells. Each reaction in the fuel-processing sequence has a different set of characteristics, which influences the type of catalyst support that should be used for that particular reaction. A wide range of supports are being evaluated for the various reactions in the fuel-processing scheme, including porous and non-porous particles, ceramic and metal straight-channel monoliths, and ceramic and metal monolithic foams. These different types of support have distinctly different transport characteristics. The best choice of support for a given reaction will depend on the design constraints for the system, e.g., allowable pressure drop, and on the characteristics of the reaction for which the catalyst is being designed. Three of the most important reaction characteristics are the intrinsic reaction rate, the exothermicity/endothermicity of the reaction, and the nature of the reaction network, e.g., whether more than one reaction takes place and, in the case of multiple reactions, the configuration of the network. Isotopic transient kinetic analysis was used to study the surface intermediates.The preferential oxidation of low concentrations of carbon monoxide in the presence of high concentrations of hydrogen (PROX) is an important final step in most fuel processor designs. Data on the behavior of straight-channel monoliths and foam monolith supports will be presented to illustrate some of the factors involved in choosing a support for this reaction.

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Removal of carbon monoxide from hydrogen-rich fuels by selective oxidation over platinum catalyst supported on zeolite

Cited by 259 publications

References 6 publications

Catalysis Research of Relevance to Carbon Management: Progress, Challenges, and Opportunities

Catalysis Research of Relevance to Carbon Management: Progress, Challenges, and Opportunities

CO-free fuel processing for fuel cell applications

Reformulation of Coal-Derived Transportation Fuels: Selective Oxidation of Carbon Monoxide on Metal Foam Catalysts

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