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Correlation between the physicochemical properties and catalytic performances of CexSn1–xO2 mixed oxides for NO reduction by CO

Paper ID Volume ID Publish Year Pages File Format Full-Text
45347 46410 2014 14 PDF Available
Title
Correlation between the physicochemical properties and catalytic performances of CexSn1–xO2 mixed oxides for NO reduction by CO
Abstract

•Sn4+ can be incorporated into the lattice of CeO2 to form uniform CexSn1–xO2 solid solution when the mole ratio of Ce:Sn is not less than 2:1.•The incorporation of Sn4+ into the lattice of CeO2 is conducive to the decrease of crystallite size, the increase of lattice strain and the improvement of reduction behavior, which further promote the enhancement of catalytic performance.•The catalytic domain (CD, -Ce3+-□-Sn2+- species) in these CexSn1–xO2 mixed oxides plays a key role in NO reduction by CO model reaction.

A series of CexSn1–xO2 mixed oxides and single oxides (CeO2 and SnO2) were prepared by inverse co-precipitation method and calcined at 450 and 750 °C to investigate the correlation between the physicochemical properties and catalytic performances of these catalysts for NO reduction by CO. The obtained samples were characterized in detail by means of XRD, UV-Raman, N2-physisorption, H2-TPR, XPS, and in situ DRIFTS technologies. Moreover, the catalytic performances of these samples were evaluated through NO reduction by CO model reaction. These results indicate that the incorporation of Sn4+ into the lattice of CeO2 can result in the decrease of crystallite size, the increase of lattice strain and the improvement of reduction behavior, which are beneficial to the enhancement of catalytic performance. Furthermore, the catalyst with the optimal mole ratio (Ce:Sn = 2:1) exhibits the best catalytic performance for NO reduction by CO model reaction, because that more catalytic domains (CD, -Ce3+-□-Sn2+- species) can be generated in the reaction process due to the enhancement of reduction behavior and the formation of uniform solid solution without crystalline SnO2 blocking the active sites. Finally, in order to explore the significant role of catalytic domain (CD, -Ce3+-□-Sn2+- species) in NO reduction by CO model reaction, a possible reaction mechanism is tentatively proposed.

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Keywords
CexSn1–xO2 mixed oxides; Reduction behavior; Surface synergetic oxygen vacancy (SSOV); Catalytic domain (CD); NO reduction by CO
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Correlation between the physicochemical properties and catalytic performances of CexSn1–xO2 mixed oxides for NO reduction by CO
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 144, January 2014, Pages 152–165
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