NOx storage and reduction over Cu/K2Ti2O5 in a wide temperature range: Activity, characterization, and mechanism
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- Title
- NOx storage and reduction over Cu/K2Ti2O5 in a wide temperature range: Activity, characterization, and mechanism
- Authors
- Wang, Q; Chung, JS
- Date Issued
- 2009-04-30
- Publisher
- ELSEVIER SCIENCE BV
- 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 degrees C), with two peak temperatures at 280 and 550 degrees C, respectively. The NOx storage and reduction mechanism over Cu/K2Ti2O5 is studied in detail. We demonstrate that, at low temperature (200-400 degrees 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 degrees 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. (C) 2009 Elsevier B.V. All rights reserved.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/26254
- DOI
- 10.1016/J.APCATA.2009.01.039
- ISSN
- 0926-860X
- Article Type
- Article
- Citation
- APPLIED CATALYSIS A-GENERAL, vol. 358, no. 1, page. 59 - 64, 2009-04-30
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