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Titolo:
Transient response method applied to the kinetic analysis of the DeNO(x)-SCR reaction
Autore:
Nova, I; Lietti, L; Tronconi, E; Forzatti, P;
Indirizzi:
Politecn Milan, Dipartimento Chim Ind & Ingn Chim G Natta, I-20133 Milan, Italy Politecn Milan Milan Italy I-20133 gn Chim G Natta, I-20133 Milan, Italy
Titolo Testata:
CHEMICAL ENGINEERING SCIENCE
fascicolo: 4, volume: 56, anno: 2001,
pagine: 1229 - 1237
SICI:
0009-2509(200102)56:4<1229:TRMATT>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
SELECTIVE CATALYTIC REDUCTION; VANADIA-TITANIA CATALYSTS; NITRIC-OXIDE; MECHANISTIC ASPECTS; MONOLITH CATALYSTS; SO2 OXIDATION; NO REDUCTION; AMMONIA; SCR; DYNAMICS;
Keywords:
selective catalytic reduction; dynamics of SCR surface reaction; transient kinetics; H2O inhibition;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Nova, I Politecn Milan, Dipartimento Chim Ind & Ingn Chim G Natta, Pzza L Da Vinci32, I-20133 Milan, Italy Politecn Milan Pzza L Da Vinci 32 Milan Italy I-20133 ilan, Italy
Citazione:
I. Nova et al., "Transient response method applied to the kinetic analysis of the DeNO(x)-SCR reaction", CHEM ENG SC, 56(4), 2001, pp. 1229-1237

Abstract

The dynamics of the selective catalytic reduction (SCR) reaction over a commercial V2O5-WO3/TiO2 catalyst is investigated by concentration programmedsurface reaction (CPSR), i.e. a modified transient response method based on linear temporal evolution of the reactant feed concentrations. The adsorption-desorption of the reactants NH3 and NO and their surface reaction are addressed independently. The data confirm that over the investigated catalyst NH, is stored on the catalyst surface, and that the reaction occurs between adsorbed NH3 and gaseous or weakly adsorbed NO. H2O significantly inhibits the SCR reaction, but this effect is not due to competition with NH3 for the adsorption on the surface acid sites at any surface coverage. A slight inhibiting effect of adsorbed NH3 on the SCR reaction is also evident. The whole set of data is quantitatively described according to a dynamic kinetic model which superimposes the surface reaction of NO reduction to the NH3 adsorption-desorption processes, and accounts for NH3 oxidation at high temperatures. It is also shown that the transient SCR-DeNO(x) data, as well as the related kinetic analysis, approach steady-state data in the limit ofslow variations. (C) 2001 Elsevier Science Ltd. All rights reserved.

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Documento generato il 14/07/20 alle ore 05:40:50