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Nature and catalytic activity of bimetallic CuNi particles on CeO2 support

Paper ID Volume ID Publish Year Pages File Format Full-Text
55198 47043 2012 8 PDF Available
Title
Nature and catalytic activity of bimetallic CuNi particles on CeO2 support
Abstract

CuNi bimetallic alloy particles supported on CeO2 are prepared by coprecipitation of the corresponding salt precursors followed by calcination and hydrogen reduction. The supported alloy particles are characterized by PXRD, H2-TPR, XPS, XANES and EXAFS techniques. The PXRD study shows that copper rich oxide phases supported on CeO2 are reduced at 200 °C. However, complete reduction of CuO–NiO phases occurs at 450 °C forming CuNi alloy particles on CeO2. The H2-TPR results show that mixed oxides are reduced at higher temperatures than pure components indicating strong wetting between oxide components and CeO2. The Ni 2p XPS shows stronger interaction between Ni2+ and CeO2 support. XANES and EXAFS studies show the formation of CuNi alloy particles with small surface segregation of Cu. The catalytic activity of the supported CuNi alloy particles is studied by non-oxidative dehydrogenation of cyclohexanol to cyclohexanone reaction. The effect of temperature, contact time and time on stream are examined to gain insights into the catalytic activity of the CeO2 supported CuNi alloy catalysts. Among all the CuNi alloy compositions, CuNi(1:1)/CeO2 catalyst shows higher catalytic activity and selectivity to cyclohexanone. Formation of stable CuNi alloy particles on CeO2 by alloy–redox support interaction and segregation of Cu are crucial factors for catalytic activity.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (95 K)Download as PowerPoint slideHighlights► Stable CuNi alloy particles are synthesized on CeO2 by reducing CuO–NiO/CeO2 precursors with different Cu/Ni ratios. ► Mixed oxides of Cu and Ni are reduced to CuNi alloys at higher temperatures than the individual oxide components supported on CeO2. ► CuNi/CeO2 is active for catalytic dehydrogenation of cyclohexanol to cyclohexanone. ► Alloying Cu with Ni improves the activity and selectivity of the supported catalyst. ► CuNi alloy–CeO2 interaction and segregation of Cu are crucial for catalytic activity.

Keywords
CuNi; Bimetallic particles; Alloy; CeO2 support; CuNi/CeO2; Cyclohexanol dehydrogenation
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Nature and catalytic activity of bimetallic CuNi particles on CeO2 support
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 198, Issue 1, 30 December 2012, Pages 140–147
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