Platinum leaching from automotive catalytic converters with aqua regia

2nd Colombian Congress of Electrochemistry; 2nd Symposium on Nanoscience and Nanotechnology

物理学;化学

Hasani, M.^1 ; Khodadadi, A.^1 ; Koleini, S.M.J.^1 ; Saeedi, A.H.^1 ; Pérez-Pacheco, Y.^2 ; Meléndez, A.M.^2

Tarbiat Modares University, Tehran, Iran^1

Universidad Industrial de Santander, CMN, Piedecuesta-Santander, Colombia^2

关键词: Autocatalysts;    Automotive catalytic converters;    Hydrochloric acid solution;    Kinetic data;    Nitric acid concentration;    Shrinking core model;    Stirring speed;    Surface chemical reactions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/786/1/012043/pdf
DOI  :  10.1088/1742-6596/786/1/012043

来源: IOP

【 摘 要 】

Herein, kinetics extraction of platinum from spent auto catalysts, using nitric acid as an oxidant in hydrochloric acid solution, was investigated. The parameters such as temperature, hydrochloric and nitric acid concentrations, stirring speed, particle size and liquid/solid ratio, were analysed. The kinetic data were analysed using the shrinking core model. A variant of this model fits the kinetic data more appropriately. At a temperature of 90°C, the values of R2in surface chemical reactions and diffusion were 0.819 and 0.937, respectively. With the alternative model, however, 0.991 was obtained. The activation energy for the dissolution was 35.75kJ/mol.