The influence of temperature on the deactivation of commercial Pd/Rh automotive catalysts

Thermal deactivation of Pt/Rh commercial automotive catalysts

“…This phenomenon has already been reported by other authors [21][22][23]. Fernandes et al [10] also observed this when studying Pd/Rh commercial automotive catalysts [24].…”

“…The adsorption isotherms obtained for the fresh catalyst were of type IV, typical of mesoporous solids [10]. Table 2 presents the textural characterization results after ageing at 900 • C. The loss of surface area reached 50% for samples aged for 12 h or more, while the pore volumes decreased and the pore diameters increased, as expected.…”

“…Its chemical homogeneity was analyzed using XRF, following the same procedure as described in Fernandes et al [10].…”

“…The catalytic evaluation and characterization techniques employed such as N 2 physisorption, X-ray diffraction (XRD), scanning electron microscopy coupled with energy-dispersive X-ray analysis (SEM-EDX) and TPR experiments were carried out according to Fernandes et al [10]. The MPP1 mixture was used to evaluate the catalytic activity on propane and CO oxidation.…”

“…Fernandes et al [10] verified the influence of ageing temperature and the atmosphere when they studied the activity of Pd/Rh commercial catalysts. Alumina and Ce/Zr phase transitions and clear textural modifications were visualized, which demonstrated that thermal ageing may cause severe changes in the commercial catalyst properties.…”