Effects of Substitution in Perovskites La2-Xsrxnio4-Lambda on Their Catalytic Action for the Nitric-Oxide + Carbon-Monoxide Reaction
Φόρτωση...
Ημερομηνία
Συγγραφείς
Ladavos, A. K.
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 Catalysis B-Environmental
Όνομα βιβλίου
Σειρά βιβλίου
Έκδοση βιβλίου
Συμπληρωματικός/δευτερεύων τίτλος
Περιγραφή
The catalytic activity of the perovskite series La2-xSrxNiO4-lambda (x = 0.00, 0.25, 0.50, 0.75, 1.00, 1.25 and 1.50) has been studied for the reduction of nitric oxide by carbon monoxide in equimolecular mixture. The conversion (X%) of reactants approaches the value X(NO)/X(CO) = 2 at low temperatures and low degree of substitution of lanthanum by strontium but tends to unity at high temperatures and high degree of substitution. This behaviour is due to the change of the rate determining step of the reaction which at low temperature is the oxygen formation through decomposition of nitric oxide while at high temperatures it is the reaction between the adsorbed oxygen species and carbon monoxide. The apparent activation energies for the nitric oxide elimination drop with the process of substitution from x = 0.00 to x = 1.00 and increase thereafter. The controlling factor of the catalytic activity of the series seems to be the strength of adsorption of oxygen on the perovskite surface. Thus it is shown that the sum of the enthalpies of the metal-oxygen bonds in the material is closely related to the temperature where reaction switches mechanism. Besides, the differential mean electronegativity of the solids is related both to the reaction rate as well as to the apparent activation energy for nitric oxide reduction.
Περιγραφή
Λέξεις-κλειδιά
perovskite la2-xsrxnio4-lambda, nitric oxide reduction, carbon monoxide oxidation, supported rhodium, absolute electronegativity, co, reduction, no, hardness, chemistry, oxidation, parameter, kinetics
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
<Go to ISI>://A1992JE30300004
http://ac.els-cdn.com/092633739280036Y/1-s2.0-092633739280036Y-main.pdf?_tid=6e1df0470d36e8cbb75c15441b31e744&acdnat=1333036420_76b00924fb98885dda3b557c0366fe96
http://ac.els-cdn.com/092633739280036Y/1-s2.0-092633739280036Y-main.pdf?_tid=6e1df0470d36e8cbb75c15441b31e744&acdnat=1333036420_76b00924fb98885dda3b557c0366fe96
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