Regeneration of used catalytic converters from gasoline vehicle waste
Karla Vizuete- Alexis Debut
Published 2021-07-16
Keywords
- catalytic converters,
- noble metals,
- oxidation-reduction,
- regeneration,
- technical feasibility of recovering
- re-use in cars,
- mitigating the effects of pollution ...More
How to Cite
Abstract
Two used commercial waste catalytic converters (CCU and CCA) were studied using the programmed temperature oxidation technique (TPO), temperature-programmed reduction (TPR), scanning electron microscopy (SEM), and energy dispersion spectroscopy of X-ray (EDS). The scanning electron microscopy showed the CCU and CCA converters of the morphology of the particles in uniform spheres of 0.05 and 1.5 µm and irregular of 2 µm. The results of the elemental analysis using the EDS technique showed for the CCU converter the presence of the noble metals platinum, palladium (Pt, Pd), and iron (Fe) as an active phase, and phosphorus oxide (P2O4), chromium oxide (Cr2O3) and calcium oxide (CaO) as promoters. On the contrary, the CCA converter presented as an active phase noble metals of Pt, Pd, and Rh and as promoters manganese oxide (MnO2), barium oxide (BaO), zirconia (ZrO2), and ceria (CeO2). The oxidation results at programmed temperature (TPO) showed the consumption of oxygen through the formation of the oxide species, and the subsequent reduction treatment at programmed temperature (TPR) showed the recovery of the reduction of the metallic species of Pt, Pd, Rh, and Fe (active phase) present in catalytic converters. This fact demonstrated the technical feasibility of recovering the activity phase of the reduced metallic surface in used commercial catalytic converters from waste for its re-use in gasoline internal combustion automobiles from mitigating the effects of pollution of emission gases.
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References
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