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Deactivation mechanisms of iron-exchanged zeolites for NH3-SCR applications

Paper ID Volume ID Publish Year Pages File Format Full-Text
53618 46977 2015 9 PDF Available
Title
Deactivation mechanisms of iron-exchanged zeolites for NH3-SCR applications
Abstract

•Deactivation mechanisms of Fe-BEA as NH3-SCR catalyst.•Regeneration using high temperature hydrogen treatment.•Hydrothermal deactivation.•Chemical deactivation due to phosphorous and potassium exposure.•Kinetic deactivation model.

Emissions of nitrogen oxides (NOX) from internal combustion engines are a major contributor to global air pollution, and with more stringent environmental legislations, the need for more efficient and durable NOX emission control systems increases. In the present paper, experimental results of hydrothermal deactivation and regeneration using hydrogen, and chemical deactivation due to phosphorous and potassium exposure of Fe-BEA as NH3-SCR catalyst are summarized. Based on the experimental results, a multi-site kinetic model is developed to predict deactivation of Fe-BEA. The kinetic model predicts deactivation well by decreasing the number of active sites in the model representing loss of active iron sites due to migration or chemical blockage of the sites. It is discussed that by performing a systematic study of different deactivation mechanisms, a deactivation expression for the active sites could be formulated.

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Keywords
Deactivation; Mechanisms; Regeneration; NH3-SCR; Iron; Zeolite
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Deactivation mechanisms of iron-exchanged zeolites for NH3-SCR applications
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 258, Part 2, 1 December 2015, Pages 432–440
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
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