Institutional Repository
Technical University of Crete
Technical University of Crete
EN
|
EL
| URI | http://purl.tuc.gr/dl/dias/0ABAF449-5706-444A-85EC-4F42591D9840 | - |
| Identifier | https://doi.org/10.1007/s11244-011-9734-6 | - |
| Language | en | - |
| Extent | 10 | en |
| Title | Thermal aging behavior of Pt-only TWC converters under simulated exhaust conditions: Effect of rare earths (CeO2, La2O3) and Alkali (Na) modifiers | en |
| Creator | Matsouka Vasiliki | en |
| Creator | Ματσουκα Βασιλικη | el |
| Creator | Konsolakis Michail | en |
| Creator | Κονσολακης Μιχαηλ | el |
| Creator | Yentekakis Ioannis.V. | en |
| Creator | Papavasiliou Aggeliki | en |
| Creator | Tsetsekou Athina | en |
| Creator | Boukos Nikolaos | en |
| Publisher | Springer US | en |
| Description | Δημοσίευση σε επιστημονικό περιοδικό | el |
| Content Summary | In 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. | el |
| Type of Item | Peer-Reviewed Journal Publication | en |
| Type of Item | Δημοσίευση σε Περιοδικό με Κριτές | el |
| License | http://creativecommons.org/licenses/by/4.0/ | en |
| Date of Item | 2015-11-03 | - |
| Date of Publication | 2011 | - |
| Subject | Thermal aging | en |
| Subject | Catalyst promotion | en |
| Subject | Simulated exhaust conditions | en |
| Bibliographic Citation | V. Matsouka, M. Konsolakis, I.V. Yentekakis, A. Papavasiliou, A. Tsetsekou, N. Boukos ," Thermal aging behavior of Pt-only TWC converters under simulated exhaust conditions: Effect of rare earths (CeO2, La2O3) and Alkali (Na) modifiers," Topics in Catalysis, vol. 54, no. 16, pp. 1124-1134, Nov. 2011. doi: 10.1007/s11244-011-9734-6 | en |
Copyright © DIAS 2013
