A million-channel CO-PrOx microreactor on a fingertip for fuel cell application

Divins, Núria J.; López, Eduardo; Roig, María; Trifonov, T.; Rodríguez, Ángel; Rivera, Ferran Gonzàlez de; Rodrı̀guez, Laura; Seco, Miquel; Rossell, Oriol; Llorca, Jordi

doi:10.1016/j.cej.2010.07.072

Cited by 26 publications

(20 citation statements)

References 30 publications

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“…The oxidation of carbon monoxide (CO) and, in particular, its preferential oxidation in the presence of large quantities of hydrogen (H 2 ) represents a very important aspect of fuel cell technology and the development of processes devoted to obtain CO-free hydrogen streams is a critical issue and an essential requirement for feeding proton exchange membrane fuel cells (PEMFC) [1]. Carbon monoxide preferential oxidation (COPrOx) is particularly appealing when applied to low-scale or portable reformer-PEMFC systems due to its fairly simple implementation, low operation costs and minimal loss of hydrogen [2][3][4]. In the COPrOx, two oxidation reactions compete for the oxygen consumption and, as a consequence, COPrOx catalysts have to exhibit high CO oxidation activity, while H 2 oxidation has to be maintained low in order to avoid fuel losses, at temperatures ranging from 80 to 200°C.…”

Section: Introductionmentioning

confidence: 99%

CO oxidation and COPrOx over preformed Au nanoparticles supported over nanoshaped CeO2

Soler

Casanovas

Urrich

et al. 2016

Applied Catalysis B: Environmental

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Au/CeO 2 (0.25% wt. Au) catalysts were prepared by anchoring preformed Au nanoparticles over ceria polycrystals, cubes and rods and tested in the oxidation of CO and COPrOx. The use of preformed Au nanoparticles assured a constant Au particle size (ca. 5 nm by HRTEM) for all samples, which allowed to a precise assessment of the effect of the morphology of nanoshaped ceria on catalytic activity. The catalytic performance of the Au/CeO 2 -rods was much better than that of the Au/CeO 2polycrystals and Au/CeO 2 -cubes both in the oxidation of CO and COPrOx reactions. The Au/CeO 2 -rods exhibited the highest amount of oxidized Au and Ce(III) species by XPS, whereas in the Au/CeO 2 -cubes gold was totally metallic and the amount of Ce(III) was minimum. An intermediate situation was encountered in the Au/CeO 2 -polycrystals. Considering the differences in the oxidation states of Au and Ce and the fact that all samples were prepared with preformed metallic Au nanoparticles of the same size, the results indicate that the intrinsic nature of the different ceria surfaces exerts a prominent role in the gold-ceria interaction and in the electron density transfer from Au to Ce, which in turn has a strong effect on catalytic activity. Gold nanoparticles strongly interact with CeO 2 -{110} surfaces with respect to CeO 2 -{111} and CeO 2 -{100}, even when Au nanoparticles are prepared separately and simply deposited by impregnation.

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Section: Introductionmentioning

confidence: 99%

CO oxidation and COPrOx over preformed Au nanoparticles supported over nanoshaped CeO2

Soler

Casanovas

Urrich

et al. 2016

Applied Catalysis B: Environmental

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“…On the other hand, Dudfield et al [13] operated a compact fin heat-exchanger reactor containing 2.5% Pt-Ru catalyst for the same reaction. Divins et al [14] reported the functionalization with Au/TiO 2 of a silicon microreactor containing ca. 40000 regular channels of 3.3 μm in diameter per square millimeter for the CO preferential oxidation.…”

Section: Introductionmentioning

confidence: 99%

Preferential oxidation of CO (CO-PROX) over CuOx/CeO2 coated microchannel reactor

et al. 2012

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The general aspects of the synthesis and characterization results of a CuO x /CeO 2 catalyst were presented. In addition the principal steps for manufacturing a microchannel reactor and for the coating of the CuO x /CeO 2 catalyst onto the microchannels walls, were also summarized. The catalytic activity of this microchannel reactor during the preferential oxidation of CO (CO-PROX) was evaluated employing a feed-stream that simulates a reformate off-gas after the WGS unit. Two activation atmospheres were studied (H 2 /N 2 and O 2 /N 2 ). The reducing pretreatment improved the resistance to deactivation by formation of carbonaceous species over the catalyst surface at high temperatures. The presence of H 2 O and CO 2 in the feed-stream was also analyzed indicating that the adsorption of CO 2 inhibited the conversion of CO at lower temperatures because these compounds modified the active sites through the formation of carbonaceous species on the catalyst surface. Finally, the experimental results of the microreactor performance were compared with CFD simulations that were carried out using a kinetic for the CuO x /CeO 2 powder catalyst. The experimental results were reasonably well described by the model, thus confirming its validity.

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“…The operating conditions at channel inlet were not the same for each tested device in the study of Using Equations (13) to (20) The Peclet numbers presented in Table 5 for the three devices show that the conventional monolith (CM) and the micro-reactor (MR) can be modeled as plug flow reactors without axial dispersion.…”

Section: Simulations Under New Working Conditionsmentioning

confidence: 99%

Impact of reducing the channel diameter on heterogeneous gas reactions in an isothermal monolith

Tilland¹,

Portha²,

Laurent³

et al. 2015

Chemical Engineering and Processing: Process Intensification

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A million-channel CO-PrOx microreactor on a fingertip for fuel cell application

Cited by 26 publications

References 30 publications

CO oxidation and COPrOx over preformed Au nanoparticles supported over nanoshaped CeO2

CO oxidation and COPrOx over preformed Au nanoparticles supported over nanoshaped CeO2

Preferential oxidation of CO (CO-PROX) over CuOx/CeO2 coated microchannel reactor

Impact of reducing the channel diameter on heterogeneous gas reactions in an isothermal monolith

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