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“Promotion by sodium in emission control catalysis: The difference betweenalkanes and alkenes in the Pd-catalysed reduction of NO by hydrocarbons

Yentekakis I.V. , Konsolakis Michail, Kiousis V. , Lambert R.M., Tikhov M.S.

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URIhttp://purl.tuc.gr/dl/dias/41D624AD-E4B8-4D69-A204-4E23116CCFBB-
Αναγνωριστικόhttp://journal.gnest.org/sites/default/files/Journal%20Papers/Yentekakis.pdf-
Γλώσσαen-
Μέγεθος9en
Τίτλος“Promotion by sodium in emission control catalysis: The difference between alkanes and alkenes in the Pd-catalysed reduction of NO by hydrocarbonsen
ΔημιουργόςYentekakis I.V. en
ΔημιουργόςKonsolakis Michailen
ΔημιουργόςΚονσολακης Μιχαηλel
ΔημιουργόςKiousis V. en
Δημιουργός Lambert R.M.en
Δημιουργός Tikhov M.S.en
ΕκδότηςGLOBAL NESTen
ΠεριγραφήΔημοσίευση σε επιστημονικό περιοδικό el
ΠερίληψηThe activity and selectivity of Pd catalysts supported on YSZ and dosed with different amounts of Na promoter has been investigated for the reduction of NO by alkenes (C3H6) or alkanes (CH4). It is found that Na strongly promotes the reduction of NO by C3H6. Rate increases by an order of magnitude are achievable, while the N2-selectivity is improved from ~75% over the unpromoted Pd catalyst to >95% over the optimally Na-promoted catalyst. With CH4 as the reductant, a very different behaviour is observed: for all loadings, Na induces only poisoning. The experimental data indicate that Na increases the strength of NO chemisorption relative to the hydrocarbons. This is accompanied by weakening of the N-O bond, thus facilitating NO dissociation, which is proposed as the critical reaction-initiating step. According to this model the promoting or poisoning effect of Na depends on the interaction strength of the catalyst surface with the hydrocarbon. The different behaviour of propene and methane reflects the weaker interaction of alkanes with metal surfaces compared to that of alkenes. XPS and Auger data demonstrate that Na coverage increases monotonically with promoter loading and that there is no significant tendency for the promoter to agglomerate with increasing promoter loading. However, a very small but constant tendency to accumulate subsurface or dissolved Na was observed as the promoter loading is increased.en
ΤύποςPeer-Reviewed Journal Publicationen
ΤύποςΔημοσίευση σε Περιοδικό με Κριτέςel
Άδεια Χρήσηςhttp://creativecommons.org/licenses/by/4.0/en
Ημερομηνία2015-11-03-
Ημερομηνία Δημοσίευσης1999-
Θεματική Κατηγορία Sodiumen
Θεματική ΚατηγορίαNO reductionen
Θεματική ΚατηγορίαMethaneen
Θεματική ΚατηγορίαPropeneen
Θεματική ΚατηγορίαPalladiumen
Θεματική ΚατηγορίαPromotionen
Βιβλιογραφική ΑναφοράI.V. Yentekakis, M. Konsolakis, V. Kiousis, R.M. Lambert and M.S. Tikhov, "Promotion by sodium in emission control catalysis: The difference between alkanes and alkenes in the Pd-catalysed reduction of NO by hydrocarbons," Global-Nest: the International Journal, vol. 1, no. 2, pp. 121-130, 1999. en

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