Platinum leaching from automotive catalytic converters with aqua regia
Mohammadreza HasaniTarbiat Modares University, Tehran, IranAbbas Ali KhodadadiTarbiat Modares University, Tehran, IranS.M. Javad KoleiniTarbiat Modares University, Tehran, IranA H SaeediTarbiat Modares University, Tehran, IranYaride Pérez PachecoUniversidad Industrial de Santander, CMN, Piedecuesta, Santander, ColombiaÁngel M. MeléndezUniversidad Industrial de Santander, CMN, Piedecuesta, Santander, Colombia
2017en
ABI
Annotatsiya
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 R2 in 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.
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