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Noble metal ion substituted CeO2 catalysts: Electronic interaction between noble metal ions and CeO2 lattice

Paper ID Volume ID Publish Year Pages File Format Full-Text
53421 46969 2015 11 PDF Available
Title
Noble metal ion substituted CeO2 catalysts: Electronic interaction between noble metal ions and CeO2 lattice
Abstract

•Noble metals are dispersed on CeO2 as ions leading to Ce1−xMxO2−δ (M = Pt, Pd, Rh and Ru) solid solutions.•Valence band positions of noble metals, noble metal ions and Ce stabilize noble metal ions in CeO2 lattice through electron transfer.•Noble metal ions in CeO2 based catalysts act as adsorption sites for catalysis.•Substitution of Ti, Zr, Sn and Fe in CeO2 increase oxygen storage capacities due to structural distortion.•Noble metal ionic catalysts show much higher catalytic activities than supported noble metal catalysts.

In last 40 years, CeO2 has been found to play a major role in the area of auto exhaust catalysis due to its unique redox properties. Catalytic activity is enhanced when CeO2 is added to the noble metals supported Al2O3 catalysts. Reason for increase in catalytic activity is due to higher dispersion of noble metals in the form of ions in CeO2. This has led to the idea of substitution of noble metal ions in CeO2 lattice acting as adsorption sites instead of nanocrystalline noble metal particles on CeO2. In this article, a brief review of synthesis, structure and catalytic properties of noble metal ions dispersed on CeO2 resulting in noble metal ionic catalysts (NMIC) like Ce1−xMxO2−δ, Ce1−x−yTixMyO2−δ, Ce1−x−yZrxMyO2−δ, Ce1−x−ySnxMyO2−δ and Ce1−x−yFexMyO2−δ (M = Pt, Pd, Rh and Ru) are presented. Substitution of Ti, Zr, Sn and Fe in CeO2 increases oxygen storage capacities (OSC) due to structural distortion, whereas dispersion of noble metal ions in Ti, Zr, Sn and Fe substituted CeO2 supports increase both OSC and catalytic activities. Electronic interaction between noble metal ions and CeO2 in NMICs responsible for higher OSC and higher catalytic activities is discussed.

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Keywords
Noble metal ionic catalyst; CeO2; Interaction; XRD; DFT; XPS
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Noble metal ion substituted CeO2 catalysts: Electronic interaction between noble metal ions and CeO2 lattice
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 253, 15 September 2015, Pages 40–50
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