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...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Catalysis letters 2014-04, Vol.144 (4), p.561-566
Hauptverfasser: Zeng, Shanghong, Fu, Xiaojuan, Wang, Xiaoman, Su, Haiquan
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
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.
ISSN:1011-372X
1572-879X
DOI:10.1007/s10562-013-1160-x