Thermal aging behavior of Pt-only TWC converters under simulated exhaust conditions: Effect of rare earths (CeO2, La2O3) and Alkali (Na) modifiersThermal aging behavior of Pt-only TWC converters under simulated exhaust conditions: Effect of rare earths (CeO2, La2O3) and Alkali (Na) modifiers Peer-Reviewed Journal Publication Δημοσίευση σε Περιοδικό με Κριτές 2015-11-032011enIn the present work, the feasibility to design monometallic (Pt-only), low metal loading (0.1 wt% Pt) three-way catalytic converters (TWCs), with comparable catalytic efficiency and thermostability to that of commercial bimetallic Pt/Rh TWCs has been explored. It is shown that this can be accomplished by modifying Pt/γ-Αl2O3 washcoat of TWC via two different methods of promotion: support-mediated promotion by modifying the γ-Al2O3 support with rare earth structure-modifiers (CeO2–La2O3) and surface-induced promotion by directly modifying the Pt surface with alkalies (e.g., Na), producing a doubly-promoted Pt(Na)/Al2O3-(CeO2–La2O3) TWC. The catalytic performance of as prepared TWCs in comparison to that of a commercial bimetallic (Pt–Rh) TWC, under simulated exhaust conditions at the stoichiometric point appears to be superior, even after severe thermal treatment at 900 °C for 5 h in air and despite the fact that the latter contain 4.5-fold higher noble metals loading. Moreover, the evolution of structural, textural and surface behavior of aged catalysts was identified by means of X-ray diffraction, scanning electron microscopy, transmission electron microscopy and diffuse reflectance infrared Fourier transform spectroscopy and appropriately correlated with the catalytic performance and thermostability of TWCs.Δημοσίευση σε επιστημονικό περιοδικό http://creativecommons.org/licenses/by/4.0/Topics in Catalysis16541124-1134 Matsouka Vasiliki Ματσουκα Βασιλικη Konsolakis Michail Κονσολακης Μιχαηλ Yentekakis Ioannis.V. Papavasiliou Aggeliki Tsetsekou Athina Boukos Nikolaos Springer US Thermal aging Catalyst promotion Simulated exhaust conditions