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Effect of yttrium on the performances of zirconia based catalysts for the decomposition of N2O at high temperature

Paper ID Volume ID Publish Year Pages File Format Full-Text
49062 46544 2006 8 PDF Available
Title
Effect of yttrium on the performances of zirconia based catalysts for the decomposition of N2O at high temperature
Abstract

Abatement processes for the reduction of N2O emissions from acid nitric plants can be implemented in different positions. Among the different possibilities, a catalytic process set up between the ammonia converter and the absorber could be a practicable solution. In those running conditions, at high temperature, in the presence of NO, O2 and water, the catalytic decomposition of N2O (in the absence of a reducing agent) can take place. However, catalysts usually suffer from a strong deactivation owing to the occurrence of thermal sintering which significantly lowers their specific surface area. Catalytic testing performed at laboratory scale showed that zirconia based catalysts stabilised by yttrium incorporation could be of potential interest. However, the mode of yttrium incorporation seems to be a key factor. According to the preparation procedure, surface yttrium enrichment may occur and then strongly inhibit the catalytic decomposition of N2O. Co-precipitation methods can be profitably used for the preparation of modified-ZrO2 catalysts in order to obtain yttrium homogeneously distributed in the bulk material. According to this preparation method, a synergy effect on the catalytic activity and also on the stability has been observed on ZrO2 containing low amount of yttrium whereas an inhibiting effect prevails on highly loaded yttrium based catalysts irrespective of the mode of yttrium incorporation.

Keywords
Green house gas; Nitrous oxide; N2O catalytic decomposition; Zirconia based catalysts; Nitric acid plant
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Effect of yttrium on the performances of zirconia based catalysts for the decomposition of N2O at high temperature
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 62, Issues 3–4, 22 February 2006, Pages 236–243
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