1. Dynamic oxygen mobility and a new insight into the role of Ni doping in Pd/CeO2–ZrO2 three-way catalysts
- Author
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Li, Guangfeng, Wang, Qiuyan, Zhao, Bo, and Zhou, Renxian
- Subjects
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SEMICONDUCTOR doping , *OXYGEN , *NICKEL , *METALLIC oxides , *PALLADIUM catalysts , *PRECIPITATION (Chemistry) , *PARTICLE size distribution , *RAMAN spectroscopy - 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]
- Published
- 2011
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