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Mechanism of the selective catalytic reduction of NOx with NH3 over environmental-friendly iron titanate catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
55716 47063 2011 8 PDF Available
Title
Mechanism of the selective catalytic reduction of NOx with NH3 over environmental-friendly iron titanate catalyst
Abstract

The reaction mechanism of the selective catalytic reduction (SCR) of NOx with NH3 over environmental-friendly iron titanate catalyst (FeTiOx) was investigated in detail. Over the iron titanate crystallite with specific Fe–O–Ti structure, both Brønsted and Lewis acid sites were present and involved in the SCR reaction. NH3 mainly adsorbed on titanium sites in the form of ionic NH4+ and coordinated NH3, while NOx mainly adsorbed on iron sites in the form of monodentate nitrate. In a relatively low temperature range (<200 °C), the SCR process mainly followed the Langmuir–Hinshelwood (L–H) mechanism, in which the formation of monodentate nitrate from NO oxidation by O2 over Fe3+ was the rate-determining step. In contrast, in a relatively high temperature range (>200 °C), the SCR process mainly followed the Eley-Rideal (E–R) mechanism, in which the formation of NH2NO intermediate species following the H-abstraction of NH3 by neighboring Fe3+ was the rate-determining step.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (184 K)Download as PowerPoint slideHighlights► Both Brønsted and Lewis acid sites were involved in NH3-SCR reaction over FeTiOx. ► Below 200 °C, NH4+ and monodentate nitrate reacted through an L–H mechanism. ► The formation of monodentate nitrate was the rate-determining step below 200 °C. ► Above 200 °C, surface NH2 and gaseous NO reacted through an E–R mechanism. ► The formation of NH2NO after H-abstraction of NH3 was the rate-determining step.

Keywords
Selective catalytic reduction; Iron titanate catalyst; Langmuir–Hinshelwood mechanism; Eley–Rideal mechanism; Rate-determining step
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 175, Issue 1, 25 October 2011, Pages 18–25
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