Institute of Catalysis, Zhejiang University, Hangzhou, PR China.
J Hazard Mater. 2011 Feb 15;186(1):911-20. doi: 10.1016/j.jhazmat.2010.11.080. Epub 2010 Nov 26.
Ce(0.67)Zr(0.33)O(2) doped with iron oxide was prepared and the corresponding Pd-only three-way catalysts were examined and characterized. Pd/CZFe(1%) catalyst exhibits the best catalytic performance for CO, HC, NO and NO(2) elimination and the widest operation window. The doping of iron oxide with 1% loading suggests the formation of more homogeneous Ce-Zr-Fe-O ternary solid solution, which seems to facilitate the reduction of Ce(4+)→Ce(3+) or the formation of oxygen vacancy and to promote the interaction between Ce-Zr and Fe. Moreover, the Ce redox behaviour for surface reduction suggests depending not only on the formation of homogeneous Ce-Zr-Fe-O but also on the surface property of the sample. The increase in the concentration of oxygen vacancies under all atmospheres for CZFe(1%) sample also results in the enhancement of oxygen storage complete capacity.
采用氧化铈掺杂氧化锆（Ce(0.67)Zr(0.33)O(2)）并制备了相应的负载钯单原子三效催化剂（Pd-only three-way catalysts），并对其进行了考察和表征。Pd/CZFe(1%) 催化剂在 CO、HC、NO 和 NO(2) 的消除方面表现出最佳的催化性能，并且具有最宽的操作窗口。1%负载量的氧化铁掺杂形成了更均匀的 Ce-Zr-Fe-O 三元固溶体，这似乎有利于 Ce(4+)→Ce(3+)的还原或氧空位的形成，并促进了 Ce-Zr 与 Fe 之间的相互作用。此外，表面还原的 Ce 氧化还原行为不仅取决于均匀的 Ce-Zr-Fe-O 的形成，还取决于样品的表面性质。在所有气氛下，CZFe(1%) 样品中氧空位浓度的增加也导致了储氧完全容量的增强。
