Surface properties, textural features and catalytic performance for NO plus CO abatement of spinels MAl2O4 (M = Mg, Co and Zn) developed by reverse and bicontinuous microemulsion method
Φόρτωση...
Ημερομηνία
Συγγραφείς
Giannakas, A. E.
Ladavos, A. K.
Armatas, G. S.
Pomonis, P. J.
Τίτλος Εφημερίδας
Περιοδικό ISSN
Τίτλος τόμου
Εκδότης
Elsevier
Περίληψη
Τύπος
Είδος δημοσίευσης σε συνέδριο
Είδος περιοδικού
peer reviewed
Είδος εκπαιδευτικού υλικού
Όνομα συνεδρίου
Όνομα περιοδικού
Applied Surface Science
Όνομα βιβλίου
Σειρά βιβλίου
Έκδοση βιβλίου
Συμπληρωματικός/δευτερεύων τίτλος
Περιγραφή
Three typical spinels of general formula MAl2O4 (M = Mg, Co and Zn) have been successfully prepared via a microemulsion method both in the reverse and bicontinuous state. The final solids were characterized by X-ray diffraction followed by Rietveld analysis, N-2 adsorption-desorption porosimetry and SEM. Pore connectivity (c) was also calculated with Seaton's method. The analysis of all these properties shown that spinels prepared via reverse microemulsion route have better surface and textural properties than bicontinuous ones. The spinels were tested for NO + CO reaction and reverse spinels shown better catalytic activity than bicontinuous ones while the full sequence of catalytic activity is: ZnAl2O4-r > ZnAl2O4-b > MgAl2O4-r > MgAl2O4-b > CoAl2O4-r > CoAl2O4-b. The Rietveld analysis helped us to give an explanation about the catalytic activity and shown that the configuration of inverse spinel phase is the critical factor for the catalytic behavior of final solids. The reactants NO and CO react in a 2: 1 ratio at low temperature but they convert in a 1:1 ratio at high temperatures. From the kinetic analysis the heats of NO adsorption are estimated and are in full agreement with the results of catalytic activity. (C) 2007 Elsevier B.V. All rights reserved.
Περιγραφή
Λέξεις-κλειδιά
microemulsion, spinels, catalysis, no plus co, nitrogen sorption measurements, sol-gel method, porous solids, mixed oxides, connectivity, combustion, area, similarities, aluminate, oxidation
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
<Go to ISI>://000247156100048
http://ac.els-cdn.com/S0169433207002255/1-s2.0-S0169433207002255-main.pdf?_tid=63ecf008b5b9c4063cc67a72c753e7d7&acdnat=1333036263_8d1d7b82744c171a290d29e817aaf19f
http://ac.els-cdn.com/S0169433207002255/1-s2.0-S0169433207002255-main.pdf?_tid=63ecf008b5b9c4063cc67a72c753e7d7&acdnat=1333036263_8d1d7b82744c171a290d29e817aaf19f
Γλώσσα
en
Εκδίδον τμήμα/τομέας
Όνομα επιβλέποντος
Εξεταστική επιτροπή
Γενική Περιγραφή / Σχόλια
Ίδρυμα και Σχολή/Τμήμα του υποβάλλοντος
Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας