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Catalytic decomposition and reduction of N2O over micro-mesoporous materials containing Beta zeolite nanoparticles

Paper ID Volume ID Publish Year Pages File Format Full-Text
45188 46405 2014 11 PDF Available
Title
Catalytic decomposition and reduction of N2O over micro-mesoporous materials containing Beta zeolite nanoparticles
Abstract

•Synthesis of micro-mesoporous zeolitic materials by non-templating method•Deposition of zeolite nanoseeds on the SBA-15 surface•N2O conversion over Fe-modified micro-mesoporous zeolitic catalysts

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.

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Keywords
Nitrous oxide; Catalytic decomposition; Beta zeolite; Zeolite nanoparticles
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Catalytic decomposition and reduction of N2O over micro-mesoporous materials containing Beta zeolite nanoparticles
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 146, March 2014, Pages 112–122
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us