Ιδρυματικό Αποθετήριο
Πολυτεχνείο Κρήτης
Πολυτεχνείο Κρήτης
EN
|
EL
| URI | http://purl.tuc.gr/dl/dias/FAEEB5B1-2206-4947-8E4F-63D5AB8A165C | - |
| Αναγνωριστικό | http://www.sciencedirect.com/science/article/pii/S0920586107001575 | - |
| Αναγνωριστικό | https://doi.org/10.1016/j.cattod.2007.03.008 | - |
| Γλώσσα | en | - |
| Μέγεθος | 8 pages | en |
| Τίτλος | The effect of potassium on the Ir/C3H6 + NO + O2 catalytic system | en |
| Δημιουργός | Goula G. | en |
| Δημιουργός | Katzourakis P. | en |
| Δημιουργός | Vakakis Nikos | en |
| Δημιουργός | Βακακης Νικος | el |
| Δημιουργός | Papadam T. | en |
| Δημιουργός | Konsolakis Michail | en |
| Δημιουργός | Κονσολακης Μιχαηλ | el |
| Δημιουργός | Tikhov, M. S | en |
| Δημιουργός | Gentekakis Ioannis | en |
| Δημιουργός | Γεντεκακης Ιωαννης | el |
| Εκδότης | Elsevier | en |
| Περίληψη | The C3H6 + NO + O2 reaction has been studied in a wide range of temperatures (ca. 250–400 °C) and oxygen concentrations (0–5% O2) over potassium-modified Ir surfaces. The in situ electrochemical controlled concept of catalysts promotion was used by interfacing a polycrystalline Ir thin film with a potassium β″-Al2O3 solid electrolyte disc, a K+ conductor. At low oxygen concentrations (i.e., at reducing conditions), the effect of potassium on the Ir activity and selectivity is negligible. However, at higher oxygen concentrations (oxidizing conditions), strong K-induced poisoning on both propene and NO turnover consumption rates, as high as ∼85% and ∼65%, respectively, were recorded. Significant reduction on the system selectivity towards N2 was also recorded under these conditions (from 100% over K-free Ir surface to ∼70% on K-modified Ir surfaces). The performance of Ir under alkali promotion is dramatically different to that reported in the literature for Pt or Pd under similar conditions, where strong promotional effects have been found. This very different behaviour may be understood in terms of the electronic influence of co-adsorbed potassium on the adsorption strengths of the neighbor reactants on the Ir surface. | en |
| Τύπος | Peer-Reviewed Journal Publication | en |
| Τύπος | Δημοσίευση σε Περιοδικό με Κριτές | el |
| Άδεια Χρήσης | http://creativecommons.org/licenses/by/4.0/ | en |
| Ημερομηνία | 2015-10-31 | - |
| Ημερομηνία Δημοσίευσης | 2007 | - |
| Θεματική Κατηγορία | Iridium | en |
| Θεματική Κατηγορία | Potassium | en |
| Θεματική Κατηγορία | De-NOx | en |
| Θεματική Κατηγορία | Selective catalytic reduction | en |
| Θεματική Κατηγορία | Stoichiometric exhaust condition | en |
| Θεματική Κατηγορία | Lean-burn conditions | en |
| Θεματική Κατηγορία | N2-selectivity | en |
| Βιβλιογραφική Αναφορά | G. Goula, P. Katzourakis, N. Vakakis, T. Papadam, M. Konsolakis, M. Tikhov and I. V. Yentekakis, "The effect of potassium on the Ir/C3H6 + NO + O2 catalytic system", Catal. Today, vol. 127, no. 1-4, pp. 199-206, Sep. 2007. doi:10.1016/j.cattod.2007.03.008 | en |
Copyright © DIAS 2013
