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Oxidative dehydrogenation of ethane over NiO–CeO2 mixed oxides catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
55588 47058 2012 8 PDF Available
Title
Oxidative dehydrogenation of ethane over NiO–CeO2 mixed oxides catalysts
Abstract

In this paper we present the synthesis, characterization and catalytic behaviour in the oxidative dehydrogenation of ethane of NiO–CeO2 mixed oxides. The addition of cerium oxide to NiO strongly modifies its catalytic performance, although the changes in the catalytic behaviour depend on the catalyst composition. The incorporation of low amounts of cerium oxide to NiO multiplies the productivity to ethylene in the oxidative dehydrogenation of ethane by a factor of ca. 7, which is the result of an increase in both catalytic activity and selectivity to ethylene. The enhanced activity has been related to the remarkable increase of the surface area of catalyst and the low crystal sizes of NiO that takes place when a tiny amount of cerium oxide is incorporated to the NiO. The higher selectivity to ethylene has been related to the modification of the nature of Ni–O species, which implies a lower production of carbon oxides. On the other hand, high activity and selectivity is also observed over catalysts rich in cerium (with Ni/Ce ratios between 0.2 and 3). In this case, a different mechanism can be proposed in which the high capacity of CeO2 to bomb oxygen from bulk to surface and the partial formation of NiO and Ce1−xNixO2 facilitates a faster reoxidation of active Ni-sites by a synergic effect improving catalytic activity.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (131 K)Download as PowerPoint slideHighlights► Ni–Ce–O mixed oxides have been prepared, characterized and tested in the ODH of ethane. ► Ni-rich catalysts show both high activity and high selectivity to ethylene. ► Ce-rich catalysts are also active and selective in ODH of ethane. ► Catalytic activity of Ni-sites strongly depend on catalyst composition. ► The nature of NiO or CeO2 crystals changes in the presence of Ce or Ni, respectively.

Keywords
Oxidative dehydrogenation of ethane; Ethylene; Cerium oxide; Nickel oxide; Catalyst characterization (XPS, TPR, XRD, Raman, FTIR of adsorbed CO, oxygen isotopic-exchange)
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Oxidative dehydrogenation of ethane over NiO–CeO2 mixed oxides catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 180, Issue 1, 17 January 2012, Pages 51–58
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
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Any Questions? feel free to contact us