| Autor: |
Fabio B. Noronha, Fabiano A. Silva, Lisiane V. Mattos, Juan A.C. Ruiz, Carla E. Hori, José Maria C. Bueno, Kátia R. de Souza |
| Rok vydání: |
2009 |
| Předmět: |
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| Zdroj: |
Applied Catalysis A: General. 364:122-129 |
| ISSN: |
0926-860X |
| Popis: |
The objective of this work was to study the effects of different noble metal loadings on Pt/CeZrO2/Al2O3 catalysts for the partial oxidation of methane. For both Al and CeZrAl series of samples, the decrease of platinum loading resulted in a significant increase of metallic dispersion. Temperature-programmed reduction and oxygen storage capacity analyses revealed that the sample containing 1.5% Pt presented superior redox properties when compared to the other samples. The catalytic tests showed that the use of smaller Pt contents lead to deactivation. X-ray absorption near edge structure experiments showed that all Pt is in the reduced form above 600 °C. In addition, there is evidence that the partial oxidation of methane proceeds through a two-step mechanism. The best performance was obtained for the 1.5Pt/CeZr/Al catalyst that has the largest platinum content, the presence of a homogeneous solid solution, good metal dispersion and high BET surface area. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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