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  Ordered mesoporous Cu–Ce–O catalysts for CO preferential oxidation in H2-rich gases: Influence of copper content and pretreatment conditions

Gu, D., Jia, C.-J., Bongard, H., Spliethoff, B., Weidenthaler, C., Schmidt, W., et al. (2014). Ordered mesoporous Cu–Ce–O catalysts for CO preferential oxidation in H2-rich gases: Influence of copper content and pretreatment conditions. Applied Catalysis B: Environmental, 152-153, 11-18. doi:10.1016/j.apcatb.2014.01.011.

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 Creators:
Gu, Dong1, Author              
Jia, Chun-Jiang2, 3, Author              
Bongard, Hans4, Author              
Spliethoff, Bernd4, Author              
Weidenthaler, Claudia5, Author              
Schmidt, Wolfgang6, Author              
Schüth, Ferdi1, Author              
Affiliations:
1Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445589              
2Research Group Rinaldi, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445617              
3Key Lab for Colloid and Interface Chemistry, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, PR China, ou_persistent22              
4Service Department Lehmann (EMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445625              
5Research Group Weidenthaler, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1950291              
6Research Group Schmidt, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445618              

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Free keywords: Mesoporous materials; Cu–Ce–O catalysts; Hard-template; CO oxidation
 Abstract: Highly ordered mesoporous Cu–Ce–O catalysts with different Cu contents have been synthesized by using ordered mesoporous silica KIT-6 as a hard template. The mesostructural order of the negative replica is influenced by the ratio of Cu to Ce. Using XRD, HR-SEM, TEM and EDX analysis, it was found that the ordered mesostructures of the nanocomposites degenerate with increasing Cu concentration, due to CuO leaching during the template removal process and a phase separation at high Cu concentration. Cu ions can replace Ce-ion in the structure of CeO2 at Cu concentrations below 40 mol%. However, the Cu concentration in the final materials is lower than expected from the ratio used in the synthesis. The activity in preferential oxidation of CO in H2-rich gases (PROX) was tested at a space velocity of 60,000 mL h−1 gcat−1. The activity of the mesoporous catalysts increases with the concentration of Cu and becomes stable for Cu concentrations higher than 20 mol%. A CO conversion around 100 % can be attained with Cu0.20Ce0.80O2 as catalyst at 160 °C. The exit CO concentration can be as low as 70 ppm under these conditions. The CO2 selectivity can reach 100 % at low temperature (60 – 80 °C). Direct loading of CuO on the surface of mesoporous CeO2 leads to large CuO crystals and correspondingly low activity. The influence of the pretreatment atmosphere on activity was also studied. Oxidation–reduction–reoxidation cycling can improve the catalytic activity of the catalysts.

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Language(s): eng - English
 Dates: 2014-01-192014-06-25
 Publication Status: Published in print
 Pages: 8
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.apcatb.2014.01.011
 Degree: -

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Title: Applied Catalysis B: Environmental
  Abbreviation : Appl. Catal. B Environ.
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 152-153 Sequence Number: - Start / End Page: 11 - 18 Identifier: ISSN: 0926-3373
CoNE: https://pure.mpg.de/cone/journals/resource/954928540173