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Structure and morphology of Pd/Al2O3 and Pd/CeO 2/Al2O3 combustion catalysts in Pd-PdO transformation hysteresis

COLUSSI, Sara
•
TROVARELLI, Alessandro
•
Vesselli, Erik
altro
Llorca, Jordi
2010
  • journal article

Periodico
APPLIED CATALYSIS A: GENERAL
Abstract
Catalytic combustion of methane has been studied for many years due to its applications in power generation and emissions clean-up Among different catalysts Pd-based materials are the most active for the catalytic combustion of methane In this work we have investigated the Pd-PdO transformation process on Pd-alumina and Pd-ceria-alumina combustion catalysts by combining different analytical techniques Both decomposition of PdO and reoxidation of Pd take place via the formation of an intermediate which has been identified as a surface or interfacial PdOx on the basis of X-ray Photoelectron Spectroscopy analysis The results obtained by coupling temperature programmed oxidation with high resolution transmission electron microscopy and X-ray photoelectron spectroscopy indicate that PdO decomposition is a thermodynamically driven process in which the support affects only the amount of PdO species involved in each decomposition step On the contrary Pd reoxidation is a kinetically limited process which is strongly affected by the environment In particular the presence of promoters such as CeO2 or residual PdO significantly speeds up Pd oxidation thus reducing the characteristic Pd-PdO hysteresis
DOI
10.1016/j.apcata.2010.09.033
WOS
WOS:000285856800002
Archivio
http://hdl.handle.net/11390/1070125
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-78649455476
Diritti
metadata only access
Soggetti
  • Catalytic combustion

  • Ceria

  • Methane

  • Palladium

  • Catalysi

  • Process Chemistry and...

Scopus© citazioni
105
Data di acquisizione
Jun 2, 2022
Vedi dettagli
Web of Science© citazioni
110
Data di acquisizione
Mar 16, 2024
Visualizzazioni
8
Data di acquisizione
Apr 19, 2024
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