Effect of Precursor Concentration on CeO2/Co3O4 Catalysts for CH4/CO2 Reforming
The CeO 2 /Co 3 O 4 catalysts were prepared via the microemulsion method, and characterized by XRD, BET, H 2 -TPR and TG–DSC techniques. It is found that the low precursor concentration can form high surface area when preparing the Co 3 O 4 supports, which is favorable for the dispersion of CeO 2 to...
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Veröffentlicht in: | Catalysis letters 2014-04, Vol.144 (4), p.561-566 |
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Hauptverfasser: | , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The CeO
2
/Co
3
O
4
catalysts were prepared via the microemulsion method, and characterized by XRD, BET, H
2
-TPR and TG–DSC techniques. It is found that the low precursor concentration can form high surface area when preparing the Co
3
O
4
supports, which is favorable for the dispersion of CeO
2
to generate CeO
2
particles with small crystallite sizes. The good reducibility not only produces more metallic cobalt to improve CH
4
/CO
2
reforming, but also helps CeO
2
realize the redox cycle via the mobility of lattice oxygen. The 0.2PCCeO
2
/Co
3
O
4
has better catalytic performance due to its small crystallite sizes of CeO
2
, high surface area and good reducibility.
Graphical Abstract
For 0.2PCCeO
2
/Co
3
O
4
and 0.3PCCeO
2
/Co
3
O
4
, it is possible that the Co
2+
or Co
3+
enters CeO
2
lattice, resulting in a contraction of CeO
2
d-spacing. For 0.4PCCeO
2
/Co
3
O
4
, an expansion of CeO
2
d-spacing might be from the formation of new phase, which is named as the difficult-reduction cobalt species. The new phase is visible when the precursor concentration increases to 0.5 M in the 0.5PCCeO
2
/Co
3
O
4. |
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ISSN: | 1011-372X 1572-879X |
DOI: | 10.1007/s10562-013-1160-x |