Compositional Mapping of Poisoning Elements in Automobile Three-Way Catalytic Converters by Using Laser-Induced Breakdown Spectrometry

Authors: Lucena, P.; Vadillo, J. M.; Laserna, J. J.

Source: Applied Spectroscopy, Volume 55, Issue 3, Pages 106A-128A and 241-370 (March 2001) , pp. 267-272(6)

Publisher: Society for Applied Spectroscopy

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Abstract:

The use of laser-induced breakdown spectrometry (LIBS) for generating two-dimensional (2D) multielemental distribution maps of poisoning agents in automobile three-way catalysts (TWCs) is discussed. A complete in-depth analysis of P, Zn, and Pb at different locations along the central channel of a used TWC in the gas flow direction was performed. The distribution maps for the metals in charge of the catalytic action and for the stabilizer of these metals - i.e., Pt, Pd, and Ce - are also presented. The 2D maps provide a fast, useful, and intuitive tool to visualize the selective distribution of poisoning elements in a used TWC. This study may help explain the deterioration processes of a catalyst with a lifetime of about 30 000 km.

Keywords: LASER-INDUCED BREAKDOWN SPECTROMETRY; LIBS; PGMS; PLATINUM GROUP METALS; THREE-WAY CATALYST; TWC

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702011951876

Affiliations: Department of Analytical Chemistry, Faculty of Sciences, University of Málaga, E-29071 Málaga, Spain.

Publication date: March 1, 2001

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