Meso- and macro-porous Pd/CexZr1-xO2 as novel oxidation catalysts

Chunman Ho, Jimmy C. Yu*, Xinchen Wang, Suk Yin LAI, Yongfu Qiu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)

Abstract

A new class of high-efficiency oxidation catalysts has been prepared using a combined surfactant and colloidal crystal templating method. The Pd/Ce xZr1-xO2 products possess mesoporous structures and macrochannels. XRD and EXD analyses confirmed the formation of a 0.8 wt.% Pd/Ce0.6Zr0.4O2 with a cubic phase at temperatures above 700°C. With increasing calcination temperature, better crystallization of the cubic phase and incorporation of more zirconium into the ceria lattice were observed. The extent of surface Ce3+ and oxygen vacancies on the samples were studied by the XPS measurements. The T 50 and T90 for CO oxidation over Pd supported catalysts were 65°C and 75°C respectively. These values were better than those obtained from catalysts without macrochannel structures and the one prepared by the co-precipitation method. Such high catalytic efficiency can be explained by the high crystal phase homogeneity, availability of more oxygen vacancies and an enlarged surface area.

Original languageEnglish
Pages (from-to)2193-2201
Number of pages9
JournalJournal of Materials Chemistry
Volume15
Issue number22
DOIs
Publication statusPublished - 14 Jun 2005

Scopus Subject Areas

  • Chemistry(all)
  • Materials Chemistry

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