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The pH-dependent Release of Platinum Group Elements (PGEs) From Gasoline and Diesel Fuel Catalysts: Implication for Weathering in Soils

The pH-dependent Release of Platinum Group Elements (PGEs) From Gasoline and Diesel Fuel Catalysts: Implication for Weathering in Soils

Veronika Suchá, Martin Mihaljevič, Vojtěch Ettler, Ladislav Strnad

J Environ Manage. 2016 Apr 15;171:52-59.

PMID: 26874614

Abstract:

Powdered samples of new and old gasoline catalysts (Pt, Pd, Rh) and new and old diesel (Pt) catalysts were subjected to a pH-static leaching procedure (pH 2-9) coupled with thermodynamic modeling using PHREEQC-3 to verify the release and mobility of PGEs (platinum group elements). PGEs were released under acidic conditions, mostly exhibiting L-shaped leaching patterns: diesel old: 5.47, 0.005, 0.02; diesel new: 68.5, 0.23, 0.11; gasoline old: 0.1, 11.8, 4.79; gasoline new 2.6, 25.2, 35.9 in mg kg(-1) for Pt, Pd and Rh, respectively. Only the new diesel catalyst had a strikingly different leaching pattern with elevated concentrations at pH 4, probably influenced by the dissolution of the catalyst carrier and washcoat. The pH-static experiment coupled with thermodynamic modeling was found to be an effective instrument for understanding the leaching behavior of PGEs under various environmental conditions, and indicated that charged Pt and Rh species may be adsorbed on the negatively charged surface of kaolinite or Mn oxides in the soil system, whereas uncharged Pd and Rh species may remain mobile in soil solutions.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
IAR42162	Gasoline in Soil - PT			Price

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