PM-support interfacial effect and oxygen mobility in Pt, Pd or Rh-loaded (Ce,Zr,La)O2 catalysts

Ting Wang, Renxian Zhou

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Front. Environ. Sci. Eng. ›› 2021, Vol. 15 ›› Issue (4) : 76. DOI: 10.1007/s11783-020-1369-z
RESEARCH ARTICLE

PM-support interfacial effect and oxygen mobility in Pt, Pd or Rh-loaded (Ce,Zr,La)O2 catalysts

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Highlights

• 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.

Abstract

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.

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Keywords

Precious metal-loaded (Ce,Zr,La)O2 catalysts / Oxygen mobility / Catalytic performance

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Ting Wang, Renxian Zhou. PM-support interfacial effect and oxygen mobility in Pt, Pd or Rh-loaded (Ce,Zr,La)O2 catalysts. Front. Environ. Sci. Eng., 2021, 15(4): 76 https://doi.org/10.1007/s11783-020-1369-z

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Acknowledgements

This work was supported by Key Program of Science Technology Department of Zhejiang Province (No.2018C03037).

Conflict of Interest

The authors declare that they have no conflict of interest.

Electronic Supplementary Material

Supplementary material is available in the online version of this article at https://doi.org/10.1007/s11783-020-1369-z and is accessible for authorized users.

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