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The effect of CeO2 structure on the activity of supported Pd catalysts used for methane steam reforming by Radu Craciun; Wayne Daniell; Helmut Knözinger is a Materials Science article available to read on EtoBox.

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Palladium (Pd) supported on CeO 2 -promoted ␥-Al 2 O 3 with various CeO 2 (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 CeO 2 structure and dispersion on the ␥-Al 2 O 3 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 CeO 2 structure. Pd is present on the oxidized CeO 2 -promoted catalysts as Pd 0 , Pd + and Pd 2+ , at ratios strongly dependent on CeO 2 structure. XRD measurements indicated that Pd is well dispersed (particles <2 nm) on crystalline CeO 2 and is agglomerated as large clusters (particles in 10-20 nm range) on amorphous CeO 2 . FTIR spectra of adsorbed CO revealed that after pre-treatment under H 2 or in the presence of amorphous CeO 2 , partial encapsulation of Pd particles occurs. CeO 2 structure influences the CH 4 steam reforming reaction rates. Crystalline CeO 2 and dispersed Pd favor high reaction rates (low activation energy)

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Author

Radu Craciun; Wayne Daniell; Helmut Knözinger

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0926-860X)

Published

2002

Language

EN

Field

Materials Science (Physical Sciences)