Decomposition of samples of used ceramic-based automotive catalytic converters in analytical autoclaves with resistive heating

Abstract

Different ways of chemical sample preparation of used automotive catalytic converters (ACCs) in analytical autoclaves with resistive heating are studied for subsequent determination of platinum, palladium, and rhodium by AES ICP. Conditions of autoclave decomposition of ACCs samples using binary mixtures of HCl-HNO 3 and HCl-H 2 O 2 that allow achieving quantitative extraction of platinum group metals into a solution without complete decomposition of the sample are determined. Universal methods of analysis of used ceramic based automotive catalytic converters are developed. The relative standard deviation of the analysis results according to the developed techniques is 11-5% rel. at contents of platinum, palladium, and rhodium from 0.03% to 0.3%.

Atomic spectrometry update. Review of advances in the analysis of metals, chemicals and functional materials

“…The application of atomic spectrometry for the analysis of catalysts continues to cover a huge diversity of materials, although a mainstay of this section is the automotive catalytic converter (ACC). Decomposition of ceramic based ACC using autoclave reaction vessels has been described by D'Yachkova et al 97 Ground catalyst materials were decomposed with HCl-HNO 3 or HCl-H 2 O 2 mixtures in a Teon autoclave, followed by determination of Pd, Pt and Rh by ICP-OES. The group investigated the effects of heating temperature (160-240 C), reaction duration (0.5-4 h) and sample mass (0.25-1 g) on the completeness of extraction in both mixtures.…”