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X-ray Absorption Spectroscopic Studies of Platinum Speciation in Fresh and Road Aged Light-Duty Diesel Vehicle Emission Control Catalysts

DOI: 10.1595/147106711X598910 DOI Help

Authors: Tim Hyde (Johnson Matthey) , Peter Ash (Johnson Matthey Technology Centre) , David Boyd (Johnson Matthey Technology Centre) , Gabriele Randlshofer (International Platinum Group Metals Association) , Klaus Rothenbacher (European Precious Metals Association) , Gopinathan Sankar (University College London)
Co-authored by industrial partner: Yes

Type: Journal Paper
Journal: Platinum Metals Review , VOL 55 (4) , PAGES 233-245

State: Published (Approved)
Published: October 2011

Abstract: The species present in a variety of fresh and road aged light-duty diesel catalysts were determined by platinum L3 edge X-ray absorption spectroscopy (XAS). It was found that it is not sufficient to use the analysis of X-ray absorption near edge structure (XANES) alone to determine the nature of species present in fresh and road aged catalysts. Detailed analysis of the extended X-ray absorption fine structure (EXAFS) revealed the presence of a mixture of oxidic and metallic species in the fresh catalysts. Metallic components were predominantly found in the road aged catalysts. The present study did not find any chloroplatinate species in the systems investigated.

Journal Keywords: Catalysis

Subject Areas: Materials


Instruments: B18-Core EXAFS