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Surface oxygen generated upon N2O activation on iron containing ZSM-5 type zeolites with different elemental composition

Paper ID Volume ID Publish Year Pages File Format Full-Text
46668 46444 2012 11 PDF Available
Title
Surface oxygen generated upon N2O activation on iron containing ZSM-5 type zeolites with different elemental composition
Abstract

Various ZSM-5 zeolites with iron contents ranging from of 0.86 to 4.98 and Si/Al ratios of 11.5–140 were prepared by solid-state ion exchange with FeCl2. The catalysts were characterised by XRD, H2-TPR and NH3-TPD. The formation and stability of surface oxygen over these zeolites were investigated with a transient multipulse technique combined with subsequent temperature-programmed desorption (TPD). Higher iron contents enhance the formation of surface oxygen. However, when a critical iron content is reached, larger iron oxide clusters and particles are formed and these larger clusters do not contribute significantly to surface oxygen formation. Moreover, the amount of desorbed oxygen is more than that formed from N2O due to the additional desorption of oxygen present in the lattice of such oxide clusters. TPD studies indicate the presence of different surface oxygen species depends on both the zeolite iron content and Si/Al ratio.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► The formation of surface oxygen depends on the certain types of iron species. ► Multinuclear iron species contributes to the surface oxygen formation. ► Bulky oxide species has only a minor impact on surface oxygen formation. ► Zeolites containing bulky iron oxide clusters also release additional oxygen. ► The Si/Al ratio of parent zeolite indirectly affects the surface oxygen formation.

Keywords
Nitrous oxide decomposition; Fe-ZSM-5; Multipulse method; Surface oxygen
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Surface oxygen generated upon N2O activation on iron containing ZSM-5 type zeolites with different elemental composition
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 119–120, 30 May 2012, Pages 329–339
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