Influence of the O2/CO ratio and the presence of H2O and CO2 in the feed-stream during the preferential oxidation of CO (PROX) over a CuOx/CeO2-coated microchannel reactor

Applied Catalysis B: Environmental

Pérez

Centeno

et al. 2015

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Section: Catalytic Activity: Co Oxidation Reactionsupporting

confidence: 91%

Synergy between gold and oxygen vacancies in gold supported on Zr-doped ceria catalysts for the CO oxidation

Applied Catalysis B: Environmental

Pérez

Centeno

et al. 2015

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“…In the case of microreactors, the same reaction set-up was used; however the cylindrical reactor was replaced by two stainless steel cases connecting the inlet and outlet positions of the microchannels, and allowing the contact between the coated walls of the channels and the feed-stream according to that described in [4,20]. The temperature was continuously monitored by 4 K-type thermocouples.…”

Section: Catalytic Activity Measurementsmentioning

confidence: 99%

“…In this sense, highly active catalysts in the CO abatement reactions are required. Actually many systems with different supports and active phases have been tested in CO oxidations reactions [2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…The manufacturing process of our microreactor prototype coated with 300 mg of catalyst [4,[18][19][20] is summarized in Figure 1. In the present work, this microreactor is named as MR300 and will be compared with a new block coated with 150 mg of catalyst, denoted as MR150.…”

Section: Introductionmentioning

confidence: 99%

“…2, respectively. F in and F out refer to molar flow rates at the reactor inlet and outlet, respectively [4,20].…”

Section: Catalytic Activity Measurementsmentioning

confidence: 99%

See 2 more Smart Citations

Microreactors technology for hydrogen purification: Effect of the catalytic layer thickness on CuO /CeO2-coated microchannel reactors for the PROX reaction

Chemical Engineering Journal

González‐Castaño

Odriozola

2015

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Two blocks of microreactors composed by 100 microchannels and coated, respectively, with 150 and 300 mg of a CuO x /CeO 2 catalyst, were prepared and tested in the preferential oxidation of CO in presence of H 2 (PROX). The deposition of different amount of catalyst resulted in different catalytic layer thicknesses thus modifying the catalytic performances of the microreactor. The evaluation of the main reaction variables (the space velocity, the O 2 -to-CO ratio and the presence of H 2 O and/or CO 2 in the stream) was performed over both microreactors and compared to that of the parent powder catalyst. The least loaded microreactor, with a coating thickness around 10 µm, presented the highest CO conversion and selectivity levels at temperatures below 160 ºC.This result evidences i) the improvement of the catalytic performances got by the structuration of the powder catalyst and ii) the importance of the selection of the adequate thickness of the catalytic layer on the microreactor, which have not to exceed and optimal value. An adequate coating thickness allows minimizing the mass and heat transport limitations, thus resulting in the enhancement of the catalytic performance during the PROX reaction.

Low‐Temperature CO Oxidation

Perovskites and Related Mixed Oxides

Bobadilla

Hernández

2015

Catalytic low-temperature abatement of carbon monoxide becomes essential in environmental pollution control. CO Oxidation, CO Preferential Oxidation (PROX) and Water Gas Shift (WGS) reaction are the conventional technologies used to remove carbon monoxide at low temperature. Perovskite-type oxides have been extensively studied in the last years as catalysts for these reactions due to their high activity and catalytic stability. This chapter describes the state-of-the-art of using perovskite-based catalysts of general formula ABO 3 in these reactions. Key factors such as the type and nature of A and B ions or the formation of oxygen vacancies or interstitials by doping are discussed in the light of the reaction mechanism in each case.