Local structure and speciation of platinum in fresh and road-aged North American sourced vehicle emissions catalysts: An x-ray absorption spectroscopic study

Peter W. Ash; David A. Boyd; Timothy I. Hyde; Jonathan L. Keating; Gabriele Randlshofer; Klaus Rothenbacher; Gopinathan Sankar; James J. Schauer; Martin M. Shafer; Brandy M. Toner

doi:10.1021/es404974e

Local structure and speciation of platinum in fresh and road-aged North American sourced vehicle emissions catalysts: An x-ray absorption spectroscopic study

Peter W. Ash, David A. Boyd, Timothy I. Hyde, Jonathan L. Keating, Gabriele Randlshofer, Klaus Rothenbacher, Gopinathan Sankar, James J. Schauer, Martin M. Shafer, Brandy M. Toner

Soil, Water, and Climate

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Abstract

Given emerging concerns about the bioavailability and toxicity of anthropogenic platinum compounds emitted into the environment from sources including vehicle emission catalysts (VEC), the platinum species present in selected North American sourced fresh and road-aged VEC were determined by Pt and Cl X-ray absorption spectroscopy. Detailed analysis of the Extended X-ray Absorption Fine Structure at the Pt L3 and L2 edges of the solid phase catalysts revealed mainly oxidic species in the fresh catalysts and metallic components dominant in the road-aged catalysts. In addition, some bimetallic components (Pt-Ni, Pt-Pd, Pt-Rh) were observed in the road-aged catalysts from supporting Ni-, Pd-, and Rh-K edge XAS studies these detailed analyses allow for the significant conclusion that this study did not find any evidence for the presence of chloroplatinate species in the investigated solid phase of a Three Way Catalyst or Diesel Oxidation Catalysts.

Original language	English (US)
Pages (from-to)	3658-3665
Number of pages	8
Journal	Environmental Science and Technology
Volume	48
Issue number	7
DOIs	https://doi.org/10.1021/es404974e
State	Published - Apr 1 2014

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Ash, P. W., Boyd, D. A., Hyde, T. I., Keating, J. L., Randlshofer, G., Rothenbacher, K., Sankar, G., Schauer, J. J., Shafer, M. M., & Toner, B. M. (2014). Local structure and speciation of platinum in fresh and road-aged North American sourced vehicle emissions catalysts: An x-ray absorption spectroscopic study. Environmental Science and Technology, 48(7), 3658-3665. https://doi.org/10.1021/es404974e

Ash, PW, Boyd, DA, Hyde, TI, Keating, JL, Randlshofer, G, Rothenbacher, K, Sankar, G, Schauer, JJ, Shafer, MM & Toner, BM 2014, 'Local structure and speciation of platinum in fresh and road-aged North American sourced vehicle emissions catalysts: An x-ray absorption spectroscopic study', Environmental Science and Technology, vol. 48, no. 7, pp. 3658-3665. https://doi.org/10.1021/es404974e

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title = "Local structure and speciation of platinum in fresh and road-aged North American sourced vehicle emissions catalysts: An x-ray absorption spectroscopic study",

abstract = "Given emerging concerns about the bioavailability and toxicity of anthropogenic platinum compounds emitted into the environment from sources including vehicle emission catalysts (VEC), the platinum species present in selected North American sourced fresh and road-aged VEC were determined by Pt and Cl X-ray absorption spectroscopy. Detailed analysis of the Extended X-ray Absorption Fine Structure at the Pt L3 and L2 edges of the solid phase catalysts revealed mainly oxidic species in the fresh catalysts and metallic components dominant in the road-aged catalysts. In addition, some bimetallic components (Pt-Ni, Pt-Pd, Pt-Rh) were observed in the road-aged catalysts from supporting Ni-, Pd-, and Rh-K edge XAS studies these detailed analyses allow for the significant conclusion that this study did not find any evidence for the presence of chloroplatinate species in the investigated solid phase of a Three Way Catalyst or Diesel Oxidation Catalysts.",

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AU - Boyd, David A.

AU - Hyde, Timothy I.

AU - Keating, Jonathan L.

AU - Randlshofer, Gabriele

AU - Rothenbacher, Klaus

AU - Sankar, Gopinathan

AU - Schauer, James J.

AU - Shafer, Martin M.

AU - Toner, Brandy M.

PY - 2014/4/1

Y1 - 2014/4/1

N2 - Given emerging concerns about the bioavailability and toxicity of anthropogenic platinum compounds emitted into the environment from sources including vehicle emission catalysts (VEC), the platinum species present in selected North American sourced fresh and road-aged VEC were determined by Pt and Cl X-ray absorption spectroscopy. Detailed analysis of the Extended X-ray Absorption Fine Structure at the Pt L3 and L2 edges of the solid phase catalysts revealed mainly oxidic species in the fresh catalysts and metallic components dominant in the road-aged catalysts. In addition, some bimetallic components (Pt-Ni, Pt-Pd, Pt-Rh) were observed in the road-aged catalysts from supporting Ni-, Pd-, and Rh-K edge XAS studies these detailed analyses allow for the significant conclusion that this study did not find any evidence for the presence of chloroplatinate species in the investigated solid phase of a Three Way Catalyst or Diesel Oxidation Catalysts.

AB - Given emerging concerns about the bioavailability and toxicity of anthropogenic platinum compounds emitted into the environment from sources including vehicle emission catalysts (VEC), the platinum species present in selected North American sourced fresh and road-aged VEC were determined by Pt and Cl X-ray absorption spectroscopy. Detailed analysis of the Extended X-ray Absorption Fine Structure at the Pt L3 and L2 edges of the solid phase catalysts revealed mainly oxidic species in the fresh catalysts and metallic components dominant in the road-aged catalysts. In addition, some bimetallic components (Pt-Ni, Pt-Pd, Pt-Rh) were observed in the road-aged catalysts from supporting Ni-, Pd-, and Rh-K edge XAS studies these detailed analyses allow for the significant conclusion that this study did not find any evidence for the presence of chloroplatinate species in the investigated solid phase of a Three Way Catalyst or Diesel Oxidation Catalysts.

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Local structure and speciation of platinum in fresh and road-aged North American sourced vehicle emissions catalysts: An x-ray absorption spectroscopic study

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