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Comparison of CuxZnAlO mixed oxide catalysts derived from multicationic and hybrid LDH precursors for methane total oxidation

Paper ID Volume ID Publish Year Pages File Format Full-Text
39723 45832 2014 10 PDF Available
Title
Comparison of CuxZnAlO mixed oxide catalysts derived from multicationic and hybrid LDH precursors for methane total oxidation
Abstract

•Coprecipitated and intercalated Cu-containing LDHs as catalyst precursors.•CuxZnAlO derived from coprecipitated LDHs were the most active for CH4 combustion.•The activity depended on the method of preparation of the LDH and on the Cu content.•Cu10ZnAlO catalyst showed the highest intrinsic activity.•The highly dispersed CuO particles are the main active sites for methane combustion.

CuxZnAlO mixed oxide catalysts for methane total oxidation have been obtained by thermal activation of layered double hydroxides (LDHs) precursors. LDHs have been prepared following two different routes: (i) conventional coprecipitation (pH = 8 or 10) and (ii) hybridation achieved by intercalation of Cu-containing anionic complexes ([Cu-EDTA]2− and [Cu-citrate]−) into host ZnAl-LDH. The mixed oxide catalysts showed only ZnO phase at Cu < 5 at.% and a mixture of ZnO and CuO phases at higher Cu content. CuO particles differently interacting with the oxide supports were revealed by TPR analysis. They were reduced at lower temperature but with a lower H2 consumption in the mixed oxides derived from the hybrids suggesting lower accessibility. The activity of the catalysts in the total oxidation of methane strongly depended on the method of preparation of the LDH precursors and on the Cu content. Cu10ZnAlO (10 at.% Cu) derived from a coprecipitated LDH showed the highest intrinsic activity and a good stability suggesting an optimum dispersion of the copper-containing active species. Among the catalysts derived from the hybrid precursors, the higher activity of the Cu(EDTA)-ZnAl ones may be due to their higher Cu content. The lower intrinsic activities and higher activation energies of this series of catalysts compared to the coprecipitated ones may be due to the lower accessibility to the CuO active sites.

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Keywords
Layered double hydroxides; Mixed oxides catalysts; Copper; Intercalation; Methane combustion
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Comparison of CuxZnAlO mixed oxide catalysts derived from multicationic and hybrid LDH precursors for methane total oxidation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 477, 5 May 2014, Pages 195–204
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us