Determination of Platinum and Palladium Content in Precious Metal Catalysts by Fire Assay-Inductively Coupled Plasma Atomic Emission Spectroscopy
Precious metal catalysts are new materials that can change the rate of chemical reactions without participating in the reactions themselves,they involve fields such as fine chemicals,basic chemicals,environmental protection,and new energy,and are composed of carriers and active components.The catalytic active components of precious metal catalysts are mainly palladium(Pd),platinum(Pt),ruthenium(Ru),rhodium(Rh),iridium(Ir),gold(Au),etc.,mostly supported by Al2O3,SiO2,and activated carbon.Fire assay is a classic method for enriching precious metals.The experiment combines fire assay with inductively coupled plasma atomic emission spectroscopy(ICP-AES),adding silver as a protective agent to enrich Pt and Pd to form composite particles,after dissolving the precious metal composite particles in aqua regia,the content of Pt and Pd in the solution is determined by ICP-AES.The experimental results show that using a combination method to determine the content of Pt and Pd in catalysts can eliminate the matrix interference that exists when ICP-AES directly determines Pt and Pd in catalysts,the measurement results have high accuracy and good precision,with a recovery rate of 98.4%～101.2%,the method is simple and fast to operate,and can be used as a method for determining Pt and Pd in catalysts.
precious metal catalystsplatinumpalladiumfire assayenrichment and separationICP-AESdetermination
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