Studies of the oxidation of palladium complexes by the advanced oxidation process

The advanced oxidation process (AOP) for the pretreatment of model palladium catalysts has been studied. Most standard metal analysis techniques are for metal ions free of organic ligands. Spent palladium catalysts contain organic ligands that need to be removed prior to analysis. AOP uses a combina...

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Bibliographic Details
Published inTalanta (Oxford) Vol. 70; no. 2; pp. 426 - 431
Main Authors Rodman, D. Lynn, Carrington, Nathan A., Xue, Zi-Ling
Format Journal Article
LanguageEnglish
Published Elsevier B.V 2006
Subjects
Advanced oxidation process
Catalysts
Hydrogen peroxide
Palladium
Hydrogen peroxide
Catalysts
Palladium
Advanced oxidation process
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Summary:The advanced oxidation process (AOP) for the pretreatment of model palladium catalysts has been studied. Most standard metal analysis techniques are for metal ions free of organic ligands. Spent palladium catalysts contain organic ligands that need to be removed prior to analysis. AOP uses a combination of hydrogen peroxide and UV light to generate radicals that decompose such ligands, freeing up metals for further analysis. Palladium acetate Pd(OAc) 2, palladium acetylacetonate Pd(acac) 2, and tris(dibenzylideneacetone)dipalladium (Pd 2(dba) 3) were chosen as model precious metal catalysts for investigation. AOP was found to decompose ligands in Pd(OAc) 2, Pd(acac) 2 and give accurate Pd(II) quantification, while ligand decomposition and oxidation of Pd(0) to Pd(II) were demonstrated in treatments involving Pd 2(dba) 3. The effects of solubility of the palladium complexes, continuous addition of H 2O 2 during AOP treatments, sample pH, concentration of H 2O 2, and length of UV irradiation are reported.
ISSN:0039-9140
1873-3573
DOI:10.1016/j.talanta.2006.02.067