%A Ting Wang, Renxian Zhou %T PM-support interfacial effect and oxygen mobility in Pt, Pd or Rh-loaded (Ce,Zr,La)O2 catalysts %0 Journal Article %D 2021 %J Front. Environ. Sci. Eng. %J Frontiers of Environmental Science & Engineering %@ 2095-2201 %R 10.1007/s11783-020-1369-z %P 76- %V 15 %N 4 %U {https://journal.hep.com.cn/fese/EN/10.1007/s11783-020-1369-z %8 2021-08-15 %X

• Pt/CZL exhibits the optimum catalytic performance for HC and NOx elimination.

• The strong PM-Ce interaction favors the oxygen mobility and DOSC.

• Pd/CZL shows higher catalytic activity for CO conversion due to more Olatt species.

• Great oxygen mobility at high temperature broadens the dynamic operation window.

• The relationship between DOSC and catalytic performance is revealed.

The physicochemical properties of Pt-, Pd- and Rh- loaded (Ce,Zr,La)O2 (shorted for CZL) catalysts before/after aging treatment were systematically characterized by various techniques to illustrate the relationship of the dynamic oxygen storage/release capacity and redox ability with their catalytic performances for HC, NOx and CO conversions. Pt/CZL catalyst exhibits the optimum catalytic performance for HC and NOx elimination, which mainly contribute to its excellent redox ability and dynamic oxygen storage/release capacity (DOSC) at lower temperature due to the stronger PM (precious metals)-support interaction. However, the worse stability of Pt-O-Ce species and volatile Pt oxides easily result in the dramatical decline in catalytic activity after aging. Pd/CZL shows higher catalytic activity for CO conversion by reason of more Olatt species as the active oxygen for CO oxidation reaction. Rh/CZL catalyst displays the widest dynamic operation window for NOx elimination as a result of greater oxygen mobility at high temperature, and the ability to retain more Rh-O-Ce species after calcined at 1100°C effectively restrains sintering of active RhOx species, improving the thermal stability of Rh/CZL catalyst.