Preferential CO oxidation over a copper–cerium oxide catalyst in a microchannel reactor

Snytnikov, P.V.; Popova, MM; Men, Yongfeng; Rebrov, Evgeny V.; Kolb, Gunther; Hessel, Volker; Schouten, JC Jaap; Sobyanin, V. A.

doi:10.1016/j.apcata.2008.07.036

Cited by 71 publications

(33 citation statements)

References 47 publications

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“…Our results are in good agreement with the highly efficient heat transfer that has been widely described for other microreactors employed in the PROX reaction, some of them coated with CuO x /CeO 2 catalysts [16,23,24]. For instance Snytnikov et al [25] have studied a copper-cerium oxide catalyst for the PROX reaction as a powder catalyst in a fixed-bed reactor and coated in microreactors. They have proposed that in the case of microreactors, the releasing of the heat produced during the oxidation reaction is very fast because of the direct contact between the catalytic layer and the metal substrate.…”

Section: Comparison Of the Cuo X /Ceo 2 Powder Catalyst And The Microsupporting

confidence: 76%

“…For this purpose, the total area of the microchannels (60 cm 2 ), the total mass of every coverage (150 and 300 mg), the pores volume of the dried (0.213 cm 3 /g) slurry and the apparent density of the deposited solid Although there are optimal conditions where the best performance in the PROX reaction is obtained for microreactores, other aspects such as the design and material of the block, the size and shape of the channels, and most likely the nature of the catalyst, must be also considering for the tuning of the reaction setup. Moreover a scale factor must be also taken into account for the optimization of a catalytic device for the PROX reaction because, for example the microreactors employed by Potemkin et al [17,25], with 14 microchannels, exhibit an optimal performance for catalytic layers around 20 µm, while in our prototype with 100 microchannels, the catalytic layer with 19 µm presents heat and mass transport problems, while the microreactor with a catalytic layer around 10 µm exhibits a better catalytic performance.…”

Section: Effect Of the O 2 /Co Molar Ratio (λ) Over The Microreactorsmentioning

confidence: 99%

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

Laguna

González‐Castaño

Odriozola

2015

Chemical Engineering Journal

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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.

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Section: Comparison Of the Cuo X /Ceo 2 Powder Catalyst And The Microsupporting

confidence: 76%

Section: Effect Of the O 2 /Co Molar Ratio (λ) Over The Microreactorsmentioning

confidence: 99%

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

Laguna

González‐Castaño

Odriozola

2015

Chemical Engineering Journal

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“…However, considering that the vast majority of modern chemical processes utilise heterogeneous catalysts to replace stoichiometric reactions due to obvious economic and environmental advantages, the application of catalytic coatings in microreactors is disproportionately scarcely studied [17]. A few gas-phase heterogeneously catalysed reactions have been studied in various reactions such as Fisher-Tropsch synthesis, CO2 hydrogenation, water gas shift [18], preferential CO oxidation [19], and complete oxidation of organic compounds [20] demonstrating a 2-5 fold increase in reaction rates compared to conventional reactors [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Scale up study of capillary microreactors in solvent-free semihydrogenation of 2‐methyl‐3‐butyn‐2‐ol

Cherkasov

Al-Rawashdeh²,

Ibhadon

et al. 2016

Catalysis Today

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warwick.ac.uk/lib-publicationsOriginal citation: Cherkasov, Nikolay, Al-Rawashdeh, Ma 'moun, Ibhadon, Alex O. and Rebrov, Evgeny V.. (2016) Scale up study of capillary microreactors in solvent-free semihydrogenation of 2-methyl-3-butyn-2-ol. Catalysis Today, 273 . pp. 205-212. Permanent WRAP URL:http://wrap.warwick.ac.uk/78678 Copyright and reuse:The Warwick Research Archive Portal (WRAP) makes this work by researchers of the University of Warwick available open access under the following conditions. Copyright © and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable the material made available in WRAP has been checked for eligibility before being made available.Copies of full items can be used for personal research or study, educational, or not-for-profit purposes without prior permission or charge. Provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. A note on versions:The version presented here may differ from the published version or, version of record, if you wish to cite this item you are advised to consult the publisher's version. Please see the 'permanent WRAP url' above for details on accessing the published version and note that access may require a subscription. Keywords: Semihydrogenation; catalytic coatings; microreactor; Palladium; alkynol; acetylene. Highlights:-Capillary reactors with a diameter of 0.53 and 1.6 mm were coated with a Pd/ZnO catalyst -The alkene selectivity above 97% was obtained in the hydrogenation of 2-methyl-3-butyn-2-ol -At a coating thickness of 6 µm, the onset of internal diffusion limitations was observed -A throughput of 28 kg/day per coated channel can be reached according to the reaction kinetics Graphical abstract:

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“…Due to the smaller particle size of catalyst, more and more CO dispersed on the surface of the catalyst. Therefore, the activity of the catalyst is increased [29,30]. The surface rebuilding behavior of different size of particles presence in a catalyst surfaces during the period of prolonged exposure to CO gas.…”

Section: Morphology Of the Catalystsmentioning

confidence: 99%

Effect of Preparation Conditions on the Catalytic Activity of CuMnOx Catalysts for CO Oxidation

Dey

Dhal

Прасад

2017

Bull. Chem. React. Eng. Catal.

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The hopcalite (CuMnOx) catalyst is a well-known catalyst for oxidation of CO at ambient temperature. It has prepared by co-precipitation method and the preparation parameters were like Copper/Manganese (Cu:Mn) molar ratios, drying temperature, drying time, calcination temperature and calcination time has an influence on activity of the resultant catalyst. The activity of the catalyst was measured in flowing air calcinations (FAC) conditions. The reaction temperature was increased from ambient to a higher value at which complete oxidation of CO was achieved. The particle size, weight of catalyst and CO flow rate in the air were also influenced by the activity of the catalyst for CO oxidation. The characterizations of the catalysts were done by several techniques like XRD, FTIR, BET, SEM-EDX and XPS. These results were interpreted in terms of the structure of the active catalyst. The main aim of this paper was to identify the optimum preparation conditions of CuMnOx catalyst with respect to the performance of catalyst for CO oxidation.

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Preferential CO oxidation over a copper–cerium oxide catalyst in a microchannel reactor

Cited by 71 publications

References 47 publications

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

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

Scale up study of capillary microreactors in solvent-free semihydrogenation of 2‐methyl‐3‐butyn‐2‐ol

Effect of Preparation Conditions on the Catalytic Activity of CuMnOx Catalysts for CO Oxidation

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