| Autor: |
E. Merlone Borla, Giuseppe Pantaleo, G. Di Carlo, Anna Maria Venezia, Marco Federico Pidria, Giulio Deganello, Leonarda F. Liotta |
| Přispěvatelé: |
LIOTTA LF, DI CARLO G, PANTALEO G, VENEZIA AM, DEGANELLO G, MERLONE BORLA E, PIDRIA M, PIDRIA MF |
| Rok vydání: |
2006 |
| Předmět: |
|
| Zdroj: |
info:cnr-pdr/source/autori:L.F. Liotta, G. Di Carlo, G. Pantaleo, A.M. Venezia, G. Deganello, E. Mrerlone Borla, M. Pidria/titolo:Supported Co3O4%2FCeO2 monoliths: effect of preparation method and Pd-Pt promotion on the CO%2FCH4 oxidation activity/titolo_volume:/curatori_volume:/editore:/anno:2006 |
| Popis: |
Two structured composite oxides, Co3O4(30wt%)-CeO2(70wt%), have been prepared by washcoating commercial cordierite monoliths with a CeO2-γAl2O3 layer, on which the active phase Co3O4-CeO2 was added through two different methods: dip-coating from a suspension containing the preformed active oxide or impregnation with a solution of the cobalt and cerium precursors. Morphological characterizations of the monoliths have been performed by BET, and SEM-EDAX analyses. Electronic and reduction properties have been evaluated by XPS and H2-TPR, respectively. The effect of the preparation method has been investigated in the catalytic oxidation of CO, whereas the promotion by a low content of Pd-Pt has been evaluated in combined CO-CH4 oxidation tests. Four successive CO oxidation cycles performed over the structured Co3O4-CeO2 indicate that the best performing sample is the monolith prepared by dip-coating, whereas that one obtained by impregnation method manifests a certain deactivation upon two consecutive cycles. Accordingly, XPS spectra are consistent with the presence of the active phase CO3O4 in the former, while Co2+ has been identified as the main species in the latter sample. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
