Title
Catalytic decomposition and reduction of <tex>$N_{2}O$</tex> over micro-mesoporous materials containing Beta zeolite nanoparticles Catalytic decomposition and reduction of <tex>$N_{2}O$</tex> over micro-mesoporous materials containing Beta zeolite nanoparticles
Author
Faculty/Department
Faculty of Sciences. Chemistry
Publication type
article
Publication
Amsterdam ,
Subject
Chemistry
Source (journal)
Applied catalysis : B : environmental. - Amsterdam
Volume/pages
146(2014) , p. 112-122
ISSN
0926-3373
ISI
000327904000013
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Zeolitic materials with combined micro and mesoporous structure were synthesized using two different approaches. A first series of the samples was obtained by impregnation method. Suspension of Beta nanoparticles was impregnated on SBA-15 mesoporous silica. In the second synthesis route, called non-templating method, Beta nanoparticles were aggregated under specified conditions with the formation of micro-mesoporous material (without the use of the mesopore directing agent). Micropores were present in the zeolite nanoparticles, while mesopores were located in the interparticle space. The combined micro and mesoporous structure of the obtained materials, exhibiting the properties of Beta zeolite, was confirmed by nitrogen sorption measurements, XRD, TGA and DRIFT techniques. The hierarchical porous structure of the samples resulted in an improved accessibility of ion-exchange positions in comparison to conventional Beta zeolite and allowed the introduction of iron, nearly exclusively in the form of monomeric Fe3+ cations and oligomeric FexOy species. The iron modified micro-mesoporous samples as well as SBA-15 and Beta zeolite (as reference samples), were tested as catalysts of N2O decomposition. The most promising micro-mesoporous sample (Fe-Beta/meso) was tested as catalyst in the reactions of N2O decomposition and N2O reduction with CO at different composition of gas mixture (in the presence of O2, H2O and NO). Catalytic activity of iron-exchanged, micro-mesoporous Beta and conventional Beta zeolites in the reaction of N2O conversion was very similar.
E-info
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