An investigation of the NO/H-2/O-2 (lean de-NOx) reaction on a highly active and selective Pt/La0.7Sr0.2Ce0.1FeO3 catalyst at low temperatures

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dc.contributor.authorCosta, C. N.en
dc.contributor.authorSavva, P. G.en
dc.contributor.authorAndronikou, C.en
dc.contributor.authorLambrou, P. S.en
dc.contributor.authorPolychronopoulou, K.en
dc.contributor.authorBelessi, V. C.en
dc.contributor.authorStathopoulos, V. N.en
dc.contributor.authorPomonis, P. J.en
dc.contributor.authorEfstathiou, A. M.en
dc.date.accessioned2015-11-24T16:48:50Z
dc.date.available2015-11-24T16:48:50Z
dc.identifier.issn0021-9517-
dc.identifier.urihttps://olympias.lib.uoi.gr/jspui/handle/123456789/9377
dc.rightsDefault Licence-
dc.subjectlean de-noxen
dc.subjectno reductionen
dc.subjectno tpden
dc.subjectperovskitesen
dc.subjectnoble-metal catalystsen
dc.subjectnitric-oxideen
dc.subjectnitrogen monoxideen
dc.subjectcarbon-monoxideen
dc.subjectno+h-2 reactionen
dc.subjectburn conditionsen
dc.subjectexcess oxygenen
dc.subjectplus coen
dc.subjectreductionen
dc.subjecth-2en
dc.titleAn investigation of the NO/H-2/O-2 (lean de-NOx) reaction on a highly active and selective Pt/La0.7Sr0.2Ce0.1FeO3 catalyst at low temperaturesen
heal.abstractA 0.1 wt% Pt supported on La0.7Sr0.2Ce0.1FeO3 solid (mixed oxide containing LaFeO3, SrFeO3-x, CeO2, and Fe2O3 phases) has been studied for the NO/H-2/O-2 reaction in the 100-400degreesC range. For a critical comparison, 0.1 wt% Pt was supported on SiO2, CeO2, and Fe2O3 and tested under the same reaction conditions. For the Pt/La0.7Sr0.2Ce0.1FeO3 catalyst a maximum in the NO conversion (83%) has been observed at 150degreesC with a N-2 selectivity value of 93%, while for the Pt/SiO2 catalyst at 120degreesC (82% conversion) with a N-2 selectivity value of 65% using a GHSV of 80,000 h(-)1 Low N-2 selectivity values, less than 45%, were obtained with the Pt/CeO2 and Pt/Fe2O3 catalysts in the 100-400degreesC range. For the Pt/La0.7Sr0.2Ce0.1FeO3 catalyst, addition of 5% H2O in the feed stream at 140degreesC resulted in a widening of the operating temperature window with appreciable NO conversion and no negative effect on the stability of the catalyst during 20 h on stream. In addition, a remarkable N-2 yield (93%) after 20 h on 0.25% NO/1% H-2/5% O-2/5% H2O/He gas stream at 140degreesC has been observed. Remarkable N-2 selectivity values in the range of 80-90% have also been observed in the 100-200degreesC low-temperature range either in the absence or in the presence of water in the feed stream. A maximum specific integral reaction rate of 443.5 mumol N-2/S . 9 Of Pt metal was measured at 160degreesC during reaction with a 0.25% NO/1% H-2/5% O-2/5% H2O/He gas mixture. This value is higher by 90% than the corresponding one observed on the 0.1 wt% Pt/SiO2 catalyst at 120degreesC and it is the highest value ever reported for the reaction at hand in the 100-200degreesC low-temperature range on Pt-based catalysts. A TOF value of 13.4 x 10(-2) s(-1) for N-2 formation was calculated at 110degrees'C for the Pt/La0.7Sr0.2Ce0.1FeO3 catalyst. Temperature-programmed desorption (TPD) of NO and transient titration experiments of the catalyst surface following NO/H-2/O-2 reaction have revealed important information concerning the amount and chemical composition of active and inactive (spectator) adsorbed N-containing species present under reaction conditions. (C) 2002 Elsevier Science (USA).en
heal.accesscampus-
heal.fullTextAvailabilityTRUE-
heal.identifier.primaryDOI 10.1006/jcat.2002.3645-
heal.identifier.secondary<Go to ISI>://000176916300018-
heal.identifier.secondaryhttp://ac.els-cdn.com/S0021951702936456/1-s2.0-S0021951702936456-main.pdf?_tid=5f8618acf1f0db7679a144f052ffd08a&acdnat=1333036498_32dfcce635e9575bbce5f6a0ee7b0758-
heal.journalNameJournal of Catalysisen
heal.journalTypepeer reviewed-
heal.languageen-
heal.publicationDate2002-
heal.publisherElsevieren
heal.recordProviderΠανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείαςel
heal.typejournalArticle-
heal.type.elΆρθρο Περιοδικούel
heal.type.enJournal articleen

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