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Dynamic oxygen mobility and a new insight into the role of Ni doping in Pd/CeO2–ZrO2 three-way catalysts
- Source :
-
Catalysis Today . Oct2011, Vol. 175 Issue 1, p40-47. 8p. - Publication Year :
- 2011
-
Abstract
- Abstract: CZ doped by nickel oxide with different loadings was prepared through a co-precipitation and supercritical dried method and the corresponding Pd-only TWCs were prepared and characterized. The results demonstrate that Pd/CZNi(3%) catalyst exhibits the best catalytic activity and the widest operation window before and after aging, compared with that of other catalysts. Moreover, the introduction of nickel oxide with 3% loading increases the average pore diameter and broadens the range of pore size distribution of sample, which is propitious to the formation of accumulative pore favoring the adsorption/desorption of reaction species. The introduction of nickel oxide with suitable loading (3%) promotes the thermal stability of CZ corresponding to the better surface composition and more concentration of Ce3+ or oxygen vacancy. Furthermore, the introduction of nickel oxide with 3% loading exhibits the best DOSC compared with other content doping, possibly due to the better structure and better surface composition and better thermal stability of CZNi(3%). [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 09205861
- Volume :
- 175
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Catalysis Today
- Publication Type :
- Academic Journal
- Accession number :
- 65944719
- Full Text :
- https://doi.org/10.1016/j.cattod.2011.04.043