In situ measurement of the redox behavior of individual ceria zirconia nanoparticles

Ruigang Wang, Peter Crozier, Renu Sharma, James Adams

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Ceria zirconia solid solution nanopowders have been widely used as automobile three-way catalysts to adjust the local oxygen environment in order to reduce pollution. The correlations between the structure, chemistry, and reducibility of individual ceria zirconia nanoparticles were studied and the critical factors that may improve their performance were identified. Nanoparticles with similar size were sometimes observed to have different redox property. A comparison of reduction behavior of two particles as a function of temperature confirmed that activity in one particle was higher as its oxidation state changed from 4 to 3 while negligible change was observed for the other. Structure of one particle had changed during ex-situ heat treatment in reducing environment, probably due to oxygen vacancy ordering. Statistical measurements obtained from 10 individual particles showed that the activity of Ce might be directly related to the variation in local chemical composition (Ce/Zr ratio) and dropped with increasing Ce concentration. This is an abstract of a paper presented at the 2007 AIChE Annual Meeting (Salt Lake City, UT 11/4-9/2007).

Original languageEnglish (US)
Title of host publication2007 AIChE Annual Meeting
StatePublished - 2007
Event2007 AIChE Annual Meeting - Salt Lake City, UT, United States
Duration: Nov 4 2007Nov 9 2007

Other

Other2007 AIChE Annual Meeting
CountryUnited States
CitySalt Lake City, UT
Period11/4/0711/9/07

Fingerprint

Cerium compounds
Zirconia
Nanoparticles
Oxidation-Reduction
Oxygen
Automobiles
Oxygen vacancies
Solid solutions
Pollution
Thermodynamic properties
Hot Temperature
Heat treatment
Oxidation
Catalysts
Temperature
Chemical analysis
zirconium oxide

ASJC Scopus subject areas

  • Biotechnology
  • Chemical Engineering(all)
  • Bioengineering
  • Safety, Risk, Reliability and Quality

Cite this

In situ measurement of the redox behavior of individual ceria zirconia nanoparticles. / Wang, Ruigang; Crozier, Peter; Sharma, Renu; Adams, James.

2007 AIChE Annual Meeting. 2007.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Wang, R, Crozier, P, Sharma, R & Adams, J 2007, In situ measurement of the redox behavior of individual ceria zirconia nanoparticles. in 2007 AIChE Annual Meeting. 2007 AIChE Annual Meeting, Salt Lake City, UT, United States, 11/4/07.
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