dc.contributor.author | Costa, Costas N. | en |
dc.contributor.author | Efstathiou, Angelos M. | en |
dc.contributor.author | Stathopoulos, Vassilis N. | en |
dc.contributor.author | Belessi, Vassiliki C. | en |
dc.creator | Costa, Costas N. | en |
dc.creator | Efstathiou, Angelos M. | en |
dc.creator | Stathopoulos, Vassilis N. | en |
dc.creator | Belessi, Vassiliki C. | en |
dc.date.accessioned | 2019-11-21T06:18:18Z | |
dc.date.available | 2019-11-21T06:18:18Z | |
dc.date.issued | 2001 | |
dc.identifier.uri | http://gnosis.library.ucy.ac.cy/handle/7/55387 | |
dc.description.abstract | The NO/H2/O2 reaction has been studied under lean-burn conditions in the 100-400°C range over 0.1 wt% Pt supported on La0.5Ce0.5MnO3 (mixed oxide containing LaMnO3, CeO2, and MnO2 phases). For a critical comparison, 0.1 wt% Pt was supported on γ-Al2O3 and tested under the same reaction conditions. The maximum in the NO conversion has been observed at 140°C (74% conversion) for the Pt/La0.5Ce0.5MnO3 and at 125°C (66% conversion) for the Pt/γ3-Al2O3 catalyst using a GHSV of 80, 000 h−1. Addition of 5% H2O in the feed stream influenced the performance of the catalyst in a positive way. In particular, it widened the operating temperature window of the catalyst above 200°C with appreciable NO conversion and had no negative effect on the stability of the catalyst for a 20-h run on reaction stream. Remarkable N2 selectivity values in the 80-90% range have been observed on the Pt/La0.5Ce0.5MnO3 catalyst in the 100-200°C range either in the absence or in the presence of water in the feed stream. This result is reported for the first time for the NO/H2/O2 lean-deNOx reaction at least on Pt-based catalysts. A maximum specific integral reaction rate of 397 μmol of N2/s.g of Pt metal was measured at 140°C during reaction with 0.25% NO/1% H2/5% O2/5% H2O/He gas mixture on the 0.1 wt% Pt/La0.5Ce0.5MnO3 catalyst. This value was found to be higher by 40% than that observed on the 0.1 wt% Pt/γ-Al2O3 catalyst at 125°C, and it is the highest value ever reported in the 100-200°C range. A TOF value of 0.49 s−1 was calculated at 140°C for the Pt/La0.5Ce0.5MnO3 catalyst. Temperature-programmed desorption (TPD) of NO and transient titration experiments of the catalyst surface following reaction have revealed important information concerning several mechanistic steps of the present catalytic system. A hydrogen-assisted NO dissociation step and a nitrogen-assisted mechanism for N2 and N2O formation are proposed to explain all the transient experiments performed in a satisfactory manner. © 2001 Academic Press. | en |
dc.source | Journal of Catalysis | en |
dc.source.uri | https://www.scopus.com/inward/record.uri?eid=2-s2.0-0035742795&doi=10.1006%2fjcat.2000.3101&partnerID=40&md5=2625fbae1d6af8fc38ffb9b49df3a25a | |
dc.subject | NO TPD | en |
dc.subject | NO reduction | en |
dc.subject | Lean de-NOx | en |
dc.subject | Perovskites | en |
dc.title | An investigation of the NO/H2/O2 (Lean-deNOx) reaction on a highly active and selective Pt/La0.5Ce0.5MnO3 catalyst | en |
dc.type | info:eu-repo/semantics/article | |
dc.identifier.doi | 10.1006/jcat.2000.3101 | |
dc.description.volume | 197 | |
dc.description.issue | 2 | |
dc.description.startingpage | 350 | |
dc.description.endingpage | 364 | |
dc.author.faculty | 002 Σχολή Θετικών και Εφαρμοσμένων Επιστημών / Faculty of Pure and Applied Sciences | |
dc.author.department | Τμήμα Χημείας / Department of Chemistry | |
dc.type.uhtype | Article | en |
dc.description.notes | <p>Cited By :126</p> | en |
dc.source.abbreviation | J.Catal. | en |
dc.contributor.orcid | Efstathiou, Angelos M. [0000-0001-8393-8800] | |
dc.contributor.orcid | Belessi, Vassiliki C. [0000-0002-9866-7668] | |
dc.contributor.orcid | Costa, Costas N. [0000-0002-8459-0356] | |
dc.contributor.orcid | Stathopoulos, Vassilis N. [0000-0001-8575-2313] | |
dc.gnosis.orcid | 0000-0001-8393-8800 | |
dc.gnosis.orcid | 0000-0002-9866-7668 | |
dc.gnosis.orcid | 0000-0002-8459-0356 | |
dc.gnosis.orcid | 0000-0001-8575-2313 | |