Partial oxidation of methane on Pt catalysts: Effect of the presence of ceria–zirconia mixed oxide and of metal content

Partial oxidation of methane on Pt catalysts: Effect of the presence of ceria–zirconia mixed oxide and of metal content

The objective of this work was to study the effects of different noble metal loadings on Pt/CeZrO 2/Al 2O 3 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. Temperatur...

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Bibliographic Details
Published in:Applied catalysis. A, General Vol. 364; no. 1; pp. 122 - 129
Main Authors: Silva, Fabiano de A., Ruiz, Juan A.C., de Souza, Katia R., Bueno, José M.C., Mattos, Lisiane V., Noronha, Fabio B., Hori, Carla E.
Format: Journal Article
Language:English
Published: Kidlington Elsevier B.V 31-07-2009
Elsevier
Subjects:
Catalysis
Cerium doped alumina
Chemistry
Exact sciences and technology
Gas-to-liquid technology
General and physical chemistry
Partial oxidation of methane
Pt/CeO 2/Al 2O 3 and Pt/CeZrO 2/Al 2O 3 catalysts
Syngas production
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Gas-to-liquid technology
Pt/CeO 2/Al 2O 3 and Pt/CeZrO 2/Al 2O 3 catalysts
Syngas production
Partial oxidation of methane
Cerium doped alumina
Methane
Binary compound
and Pt/CeZr0
Cerium
Al
Cerium oxide
Solid solution
CeO
Synthesis gas
Supported catalyst
Mechanism
O
Lanthanide compound
Chemical reduction
Storage capacity
Platinum
Technology
catalysts
Noble metal
Structure
Oxygen
Catalytic reaction
Deactivation
Pt
Transition element compounds
Transition metal
Partial oxidation
Dispersion
Zirconia
Heterogeneous catalysis
Liquid
Surface area
Alumina
X ray absorption
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Summary:The objective of this work was to study the effects of different noble metal loadings on Pt/CeZrO 2/Al 2O 3 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. This work evaluated the effects of different noble metal loadings on Pt/CeZrO 2/Al 2O 3 catalysts for the partial oxidation of methane. The use of smaller Pt contents leads to deactivation. 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.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0926-860X
1873-3875
DOI:10.1016/j.apcata.2009.05.038