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Highly active and stable bimetallic Ir/Fe-USY catalysts for direct and NO-assisted N2O decomposition

Paper ID Volume ID Publish Year Pages File Format Full-Text
48214 46496 2008 8 PDF Available
Title
Highly active and stable bimetallic Ir/Fe-USY catalysts for direct and NO-assisted N2O decomposition
Abstract

The current research investigated N2O decompositions over the catalysts Ir/Fe-USY, Fe-USY and Ir-USY under various conditions, and found that a trace amount of iridium (0.1 wt%) incorporated into Fe-USY significantly enhanced N2O decomposition activity. The decomposition of N2O over this catalyst (Ir/Fe-USY-0.1%) was also partly assisted by NO present in the gas mixture, in contrast to the negative effect of NO over noble metal catalysts. Moreover, Ir/Fe-USY-0.1% can decompose more than 90% at 400 °C (i.e. the normal exhaust temperature) under simulated conditions of a typical nitric acid plant, e.g. 5000 ppm N2O, 5% O2, 700 ppm NO and 2% H2O in balance He, and such an activity can be kept for over 110 h under these strict conditions. The excellent properties of bimetallic Ir/Fe-USY-0.1% catalyst are presumably related to the good dispersion of Fe and Ir on the zeolite framework, the formation of framework Al–O–Fe species and the electronic synergy between the Ir and Fe sites. The reaction mechanism for N2O decomposition has been further discussed on the temperature-programmed desorption profiles of O2, N2 and NO2.

Keywords
Bimetallic catalyst; Ir/Fe-USY; Synergy; NO-assisted N2O decomposition; Durability
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Highly active and stable bimetallic Ir/Fe-USY catalysts for direct and NO-assisted N2O decomposition
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 84, Issues 3–4, 1 December 2008, Pages 734–741
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