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NOx storage and reduction over Cu/K2Ti2O5 in a wide temperature range: Activity, characterization, and mechanism

Paper ID Volume ID Publish Year Pages File Format Full-Text
42928 45947 2009 6 PDF Available
Title
NOx storage and reduction over Cu/K2Ti2O5 in a wide temperature range: Activity, characterization, and mechanism
Abstract

A novel NOx storage-reduction catalyst Cu/K2Ti2O5, which uses K2Ti2O5 rather than Ba and Al2O3 as NOx storage compound as well as support, has been synthesized and investigated. Activity tests including temperature-programmed ramping, isothermal storage, and lean-rich cycling reveal that Cu/K2Ti2O5 adsorbs NOx over a very wide temperature range (200–600 °C), with two peak temperatures at 280 and 550 °C, respectively. The NOx storage and reduction mechanism over Cu/K2Ti2O5 is studied in detail. We demonstrate that, at low temperature (200–400 °C), NOx is adsorbed on the oxygen vacancy sites which are formed on K2Ti2O5 support during the lean-period; whereas at high temperature (500–600 °C), the NOx storage and reduction is explained by a structure switching between K2Ti2O5 and K2Ti6O13 caused by NO2 adsorption and de-sorption. Our results also provide another option for synthesizing NSR catalysts with K2Ti2O5 or even with other potassium containing compounds.

Graphical abstractCu/K2Ti2O5, synthesized as novel NOx storage-reduction catalyst, adsorbs NOx at both low (100–400 °C) and high temperature (500–600 °C). The experimental data reveal that the oxygen vacancies are the sites for NOx adsorption at low temperature, whereas the high temperature NOx adsorption is accompanied by a structure change between K2Ti2O5 and K2Ti6O13.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Potassium titanate; NOx storage; Oxygen vacancy; Structure change; K2Ti6O13; Vehicle emission
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NOx storage and reduction over Cu/K2Ti2O5 in a wide temperature range: Activity, characterization, and mechanism
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 358, Issue 1, 30 April 2009, Pages 59–64
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