Studies of the oxidation of palladium complexes by the advanced oxidation process Pretreatment of model catalysts for precious metal analysis |
| |
| Authors: | Rodman D Lynn Carrington Nathan A Xue Zi-Ling |
| |
| Institution: | Department of Chemistry, The University of Tennessee, Knoxville, Tennessee 37996-1600, USA |
| |
| Abstract: | 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 (Pd2(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 Pd2(dba)3. The effects of solubility of the palladium complexes, continuous addition of H2O2 during AOP treatments, sample pH, concentration of H2O2, and length of UV irradiation are reported. |
| |
| Keywords: | Palladium Advanced oxidation process Catalysts Hydrogen peroxide |
| 本文献已被 ScienceDirect PubMed 等数据库收录！ |
|
