The effect of CeO2 structure on the activity of supported Pd catalysts used for methane steam reforming

Autor:	Radu Craciun, Wayne Daniell, Helmut Knözinger
Rok vydání:	2002
Předmět:	Alkane chemistry.chemical_classification Chemistry Process Chemistry and Technology Catalyst support Inorganic chemistry Infrared spectroscopy chemistry.chemical_element Heterogeneous catalysis Catalysis Steam reforming X-ray photoelectron spectroscopy Palladium
Zdroj:	Applied Catalysis A: General. 230:153-168
ISSN:	0926-860X
DOI:	10.1016/s0926-860x(01)01003-1
Popis:	Palladium (Pd) supported on CeO2-promoted γ-Al2O3 with various CeO2 (ceria) crystallinities, were used as catalysts in the methane steam reforming reaction. X-ray diffraction (XRD) analysis, FTIR spectroscopy of adsorbed CO, and X-ray photoelectron spectroscopy (XPS) were employed to characterize the samples in terms of Pd and CeO2 structure and dispersion on the γ-Al2O3 support. These results were correlated with the observed catalytic activity and deactivation process. Arrhenius plots at steady-state conditions are presented as a function of CeO2 structure. Pd is present on the oxidized CeO2-promoted catalysts as Pd0, Pd+ and Pd2+, at ratios strongly dependent on CeO2 structure. XRD measurements indicated that Pd is well dispersed (particles
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::378fbedc0ca37d7de290f92343b678eb https://doi.org/10.1016/s0926-860x(01)01003-1 Zobrazit plný text záznamu Full Text from ScienceDirect