Accurate determination of three-way catalyst dissolution samples and precious metals of automobile exhaust waste

The three-way catalyst (TWC) of automobile exhaust waste has a huge proportion of precious metal recycling resources, which not only has important environmental significance for its recycling, but also has extremely high economic value. However, the content of Pt, Pd and Rh in the three-way catalyst of automobile exhaust waste is low and the distribution is uneven, which leads to inaccurate detection results and large errors, which is the main problem faced by the research on the recovery of precious metals. In this study, we focused on the sampling methods and dissolution methods of platinum, palladium and rhodium in automobile exhaust waste three-way catalysts, and the samples were subjected to conventional acid solubilization, microwave digestion and alkali roasting, respectively. The results showed that compared with other methods, the microwave digestion had the best effect, the sample was completely dissolved, and the inductively coupled plasma spectroscopy (ICP-AES) was used for detection and analysis, and the measured Pt, Pd and Rh contents were stable and accurate. This study is of great significance for the recovery of secondary precious metal resources, and also provides a reference for the accurate detection of platinum, palladium and rhodium contents in automobile exhaust waste catalysts.