CO Clean‐Up: Preferential Oxidation

Ouyang, X.; Besser, R.S.

doi:10.1002/9783527631445.ch44

Cited by 2 publications

(4 citation statements)

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“…Microreactors can help to meet those requirements [4,5]. More specifically, due to the very fast chemical kinetics and exothermicity of CO-PrOx, using microreactors allows avoiding mass and heat transport limitations which results in improved reactor performance and reaction selectivity [6][7][8]. As reviewed by Ouyang and Besser [8], there are several examples of integrated fuel processors in the power range between 2.4 W e and 2 kW e including CO-PrOx units based on microreaction technology.…”

Section: Introductionmentioning

confidence: 99%

“…More specifically, due to the very fast chemical kinetics and exothermicity of CO-PrOx, using microreactors allows avoiding mass and heat transport limitations which results in improved reactor performance and reaction selectivity [6][7][8]. As reviewed by Ouyang and Besser [8], there are several examples of integrated fuel processors in the power range between 2.4 W e and 2 kW e including CO-PrOx units based on microreaction technology. More recently, Kolb et al [9] and O'Connell et al [10] have reported on microstructured reactors in the 2.5-5 kW electrical output developed for CO-PrOx reaction although the catalyst used (Johnson Matthey Fuel Cells) was not specified.…”

Section: Introductionmentioning

confidence: 99%

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Selective CO removal over Au/CeFe and CeCu catalysts in microreactors studied through kinetic analysis and CFD simulations

Arzamendi

Uriz

Diéguez

et al. 2011

Chemical Engineering Journal

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Selective CO removal over Au/CeFe and CeCu catalysts in microreactors studied through kinetic analysis and CFD simulations, Chemical Engineering Journal (2010), doi:10.1016/j.cej.2010.08.083 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. E-mail address: lgandia@unavarra.es (L.M. Gandía) AbstractA kinetic study of the preferential oxidation of CO in H 2 rich streams (CO-PrOx) over a cerium-copper oxide (CeCu) and a gold catalyst supported on cerium-iron oxide (Au/CeFe) is presented. The gold catalyst is very active but the CeCu oxide is more selective. A kinetic model describing the CO-PrOx system with CO 2 and H 2 O in the feed has been formulated considering the oxidation of CO and H 2 and the reverse water-gas shift reaction. The rate equations have been implemented in computational fluid dynamics codes to study the influence of the operating variables on the CO-PrOx in microchannels and microslits. TheCeCu catalyst is the only one capable of achieving final CO contents below 10-100 ppmv.Due to the opposite effect of temperature on activity and selectivity there is an optimalPage 2 of 31 A c c e p t e d M a n u s c r i p t 2 temperature at which the CO content is minimal over CeCu. This temperature varies between 170 and 200 ºC as the GHSV increases from 10 000 to 50 000 h -1. Simulations have evidenced the very good heat transfer performance of the microdevices showing that the COPrOx temperature can be controlled using air as cooling fluid although the inlet temperature and flow rate should be carefully controlled to avoid reaction extinction. Both microchannels and microslits behaved similarly. The fact that the microslits are much easier to fabricate may be an interesting advantage in favor of that geometry in this case.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Selective CO removal over Au/CeFe and CeCu catalysts in microreactors studied through kinetic analysis and CFD simulations

Arzamendi

Uriz

Diéguez

et al. 2011

Chemical Engineering Journal

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“…Microreactors have the advantages of fast response time, easy integration, and small footprint, which are ideal for portable power systems. In addition, enhanced mass and heat transport properties are also widely recognized as advantages of microreactors [2][3][4][5][6]. In addition to this, recent studies of simulated CO-PROX reactions have shown that the reverse water-gas-shift side reaction is favoured in the case of packed bed reactors with respect to thin catalytic films deposited on microchannel walls [4].…”

Section: Introductionmentioning

confidence: 99%

“…In addition to this, recent studies of simulated CO-PROX reactions have shown that the reverse water-gas-shift side reaction is favoured in the case of packed bed reactors with respect to thin catalytic films deposited on microchannel walls [4]. Therefore, CO-PROX units based on microchannel reactors have been reported as part of integrated fuel processors in a wide power range [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Design and testing of a microchannel reactor for the PROX reaction

Cruz

Sánz

Poyato

et al. 2011

Chemical Engineering Journal

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The different steps for manufacturing a microchannel reactor for the PROX reaction are discussed. Transient Liquid Phase bonding (TLP) using a Ni-B-Si amorphous melt spun is used for joining micromilled Al-alloyed ferritic stainless steel plates followed by recrystallization at 1200ºC for 5 hours. A CuO x -CeO 2 catalyst synthesized by the coprecipitation method was washcoated on the microchannel block resulting in a homogenous 20-30 µm thick layer. The catalytic activity for CO-PROX reaction is similar in both the powder catalyst and the microchannel coated reactor but the selectivity is higher in the microchannel reactor. Keywords

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CO Clean‐Up: Preferential Oxidation

Cited by 2 publications

References 40 publications

Selective CO removal over Au/CeFe and CeCu catalysts in microreactors studied through kinetic analysis and CFD simulations

Selective CO removal over Au/CeFe and CeCu catalysts in microreactors studied through kinetic analysis and CFD simulations

Design and testing of a microchannel reactor for the PROX reaction

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