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Kinetics of hydrogen chemisorption on high surface area Pd/Ce0.8Zr0.2O2

GENNARI F. C
•
NEYERTZ C
•
MEYER G
altro
GRAZIANI, MAURO
2005
  • journal article

Periodico
JOURNAL OF ALLOYS AND COMPOUNDS
Abstract
The effect of pre-reduction conditions on the H2 chemisorption kinetics of high surface area Pd(0.53 wt.%)/Ce0.8Zr 0.2O2 was investigated by means of temperature-programmed reduction, oxygen-storage capacity, IR spectroscopy and volumetric hydrogen measurements. In the 20-80 ° C range, the pre-reduction rate was very fast and dependent on temperature, with an apparent activation energy of 58 kJ mol-1. Distinction between PdO reduction and H spillover processes is only possible at low H2 pressures. The total H2 uptake and the chemisorption rate strongly decrease by the use of high H2 pressures during the pre-reduction process. Irreversible reduction with the concomitant oxygen vacancies formation occurs at low temperature, as demonstrated by in situ IR experiments. However, H2 uptake on the Pd(0.53 wt.%)/Ce0.8Zr0.2O2 during pre-reduction and chemisorption is recovered by reoxidation at 400 ° C.
DOI
10.1016/j.jallcom.2004.10.096
WOS
WOS:000234100100073
Archivio
http://hdl.handle.net/11368/1694264
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-28044450888
Diritti
metadata only access
Soggetti
  • kinetic

  • ceria-zirconia mixed ...

Web of Science© citazioni
3
Data di acquisizione
Mar 19, 2024
Visualizzazioni
4
Data di acquisizione
Apr 19, 2024
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