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Tungstated zirconia as promising carrier for DeNOX catalysts with improved resistance towards alkali poisoning

Paper ID Volume ID Publish Year Pages File Format Full-Text
49094 46549 2006 7 PDF Available
Title
Tungstated zirconia as promising carrier for DeNOX catalysts with improved resistance towards alkali poisoning
Abstract

Use of biomass as an alternative to fossil fuels has achieved increasing interest since it is considered neutral regarding CO2 accumulation in the atmosphere. The by far most energy-efficient use of solid bio-resources in energy production is combustion in combined biomass and coal or oil-fired power plants. However, in this operation traditional catalysts exhibit significant deactivation within relatively short time. The main reason for this deactivation is the presence of a high amount of potassium compounds, which act as poisons for the catalyst. Therefore, there is a need for development of new alternative catalysts that are more resistant towards poisoning with potassium.Vanadia-based catalysts supported on traditional and tungstated zirconia has been prepared and tested in selective catalytic reduction of NO with ammonia. All prepared catalysts were characterized using N2-BET, XRD, and NH3-TPD methods. The influence of calcination temperature of zirconia modified with tungsten oxide on the textural characteristics, acidity and catalytic performance was studied. The resistance of the catalysts towards model poisoning with potassium was found to depend dramatically on the crystallinity of the zirconia and on the surface acidity. Vanadia supported on tungstated zirconia calcined at 700 °C revealed superior catalytic performance and resistance towards alkali poisoning in comparison with a traditional catalyst. The improved poisoning resistance of the samples based on tungstated zirconia can be related to the fact that a significant part of potassium on the surface of the catalyst preferentially interact with strong acidic sites now present on the support, thereby preventing vanadium species from poisoning and leaving them available for the catalytic cycle.

Keywords
Biomass; NO SCR with ammonia; Potassium poisoning; Deactivation; Tungstated zirconia; Vanadium oxide; NH3-TPD
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Tungstated zirconia as promising carrier for DeNOX catalysts with improved resistance towards alkali poisoning
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 66, Issues 3–4, 20 July 2006, Pages 161–167
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