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Dynamic oxygen mobility and a new insight into the role of Ni doping in Pd/CeO2–ZrO2 three-way catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
55719 47063 2011 8 PDF Available
Title
Dynamic oxygen mobility and a new insight into the role of Ni doping in Pd/CeO2–ZrO2 three-way catalysts
Abstract

CZ doped by nickel oxide with different loadings was prepared through a co-precipitation and supercritical dried method and the corresponding Pd-only TWCs were prepared and characterized. The results demonstrate that Pd/CZNi(3%) catalyst exhibits the best catalytic activity and the widest operation window before and after aging, compared with that of other catalysts. Moreover, the introduction of nickel oxide with 3% loading increases the average pore diameter and broadens the range of pore size distribution of sample, which is propitious to the formation of accumulative pore favoring the adsorption/desorption of reaction species. The introduction of nickel oxide with suitable loading (3%) promotes the thermal stability of CZ corresponding to the better surface composition and more concentration of Ce3+ or oxygen vacancy. Furthermore, the introduction of nickel oxide with 3% loading exhibits the best DOSC compared with other content doping, possibly due to the better structure and better surface composition and better thermal stability of CZNi(3%).

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (114 K)Download as PowerPoint slideHighlights► Pd/CZNi(3%) catalyst exhibits the best catalytic activity before and after aging. ► The introduction of Ni with 3% loading promotes the thermal stability of CZ. ► CZNi(3%) exhibits better surface composition and more concentration of Ce3+. ► The increasing of oxygen vacancies for CZNi leads to the enhancement of DOSC.

Keywords
Dynamic oxygen mobility; Ce0.67Zr0.33O2; In situ Raman; Ni; Pd-only three-way catalyst
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Dynamic oxygen mobility and a new insight into the role of Ni doping in Pd/CeO2–ZrO2 three-way catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 175, Issue 1, 25 October 2011, Pages 40–47
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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