Ιδρυματικό Αποθετήριο
Πολυτεχνείο Κρήτης
Πολυτεχνείο Κρήτης
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| URI | http://purl.tuc.gr/dl/dias/3E483F09-EC79-4365-B516-A0D943A9B8E5 | - |
| Αναγνωριστικό | https://doi.org/10.1007/s11244-016-0584-0 | - |
| Αναγνωριστικό | https://link.springer.com/article/10.1007/s11244-016-0584-0 | - |
| Γλώσσα | en | - |
| Μέγεθος | 8 pages | en |
| Τίτλος | Effect of alkali promoters (K) on nitrous oxide abatement over Ir/Al2O3 catalysts | en |
| Δημιουργός | Papista Eleni | en |
| Δημιουργός | Pachatouridou Eleni | en |
| Δημιουργός | Παχατουριδου Ελενη | el |
| Δημιουργός | Goula Maria A. | en |
| Δημιουργός | Marnellos, Georges E | en |
| Δημιουργός | Iliopoulou Eleni F. | en |
| Δημιουργός | Konsolakis Michail | en |
| Δημιουργός | Κονσολακης Μιχαηλ | el |
| Δημιουργός | Gentekakis Ioannis | en |
| Δημιουργός | Γεντεκακης Ιωαννης | el |
| Εκδότης | Springer Nature [academic journals on nature.com] | en |
| Περίληψη | The promoting impact of potassium (0–1 wt% K) on nitrous oxide (N2O) catalytic decomposition over Ir/Al2O3 is investigated under both oxygen deficient and oxygen excess conditions. All samples were characterized by means of X-ray powder diffraction (XRD), temperature-programmed reduction (H2-TPR), ammonia desorption (NH3-TPD) and Fourier Transform Infrared Spectroscopy of pyridine adsorption (FTIR-Pyridine). The results reveal that the K-free Ir/Al2O3 catalyst consists mainly of the IrO2 phase, exhibiting also significant Lewis acidity, which is gradually eliminated by the addition of K. Catalytic performance results showed that the deN2O performance in the absence of O2 in the feed mixture is negatively affected upon increasing potassium loading. However, under oxygen excess conditions, a pronounced effect of K is observed. Although the catalytic performance of the un-doped catalyst is drastically hindered by the presence of O2, the K-promotion notably prohibits the oxygen poisoning. The optimum deN2O performance under oxygen excess conditions is obtained with potassium loading of 0.5 wt% K, which offers complete conversion of N2O at 580 °C, instead of the corresponding 50 % N2O conversion achieved with the un-modified sample. On the basis of characterization results, it was concluded that alkali-doping in combination with oxygen excess conditions are required towards the formation of active Ir entities. | 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 | 2018-10-10 | - |
| Ημερομηνία Δημοσίευσης | 2016 | - |
| Θεματική Κατηγορία | Alumina | en |
| Θεματική Κατηγορία | Iridium | en |
| Θεματική Κατηγορία | N2O decomposition | en |
| Θεματική Κατηγορία | Potassium promoter | en |
| Βιβλιογραφική Αναφορά | E. Papista, E. Pachatouridou, M. A. Goula, G. Ε. Marnellos, E. Iliopoulou, M. Konsolakis and I. V. Yentekakis, "Effect of alkali promoters (K) on nitrous oxide abatement over Ir/Al2O3 catalysts," Top. Catal., vol. 59, no. 10-12, pp. 1020-1027, Jul. 2016. doi: 10.1007/s11244-016-0584-0 | el |
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