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Low-temperature CO oxidation by Pd/CeO2 catalysts synthesized using the coprecipitation method

Paper ID Volume ID Publish Year Pages File Format Full-Text
45701 46421 2015 13 PDF Available
Title
Low-temperature CO oxidation by Pd/CeO2 catalysts synthesized using the coprecipitation method
Abstract

•Pd/CeO2 catalysts of low-temperature CO oxidation were synthesized by coprecipitation method.•Two types of Pd components: PdO nanoparticles and PdxCe1−xO2−δ solid solution were observed.•HRTEM revealed PdO nanoparticles inside the agglomerates of support nanoparticles.•XPS showed the catalysts calcination produced Pd species with Eb(Pd3d5/2)∼336 and ∼338 eV.•TPR-CO revealed a high reactive oxygen in the composition of PdOx(s)/Pd–O–Ce(s) species.•PdOx(s)/Pd–O–Ce(s) and PdxCe1−xO2−δ species both are responsible for low-temperature activity.

Pd/CeO2 catalysts synthesized using the coprecipitation method under a wide range of palladium loading and calcination temperatures were investigated in this study. Structural (XRD, TEM), spectroscopic (XPS) and kinetic (TPR-CO) methods were used to investigate the morphological and structural forms of the catalysts and identify the states of palladium as the active component on the CeO2 surface and in its bulk. It was found that the synthesis and subsequent calcination at 450 °C resulted in the formation of two main types of the catalyst components: PdO nanoparticles and PdxCe1−xO2−δ solid solution. Application of HRTEM allowed to establish the formation of aggregates where ceria or PdxCe1−xO2−δ nanoparticles were located around PdO nanoparticles. A subsequent calcination process resulted in partial dissolution of PdO nanoparticles in ceria lattice and formation of the surface compounds of palladium and ceria, PdOx(s)/Pd–O–Ce(s), which contain high reactive oxygen according to the TPR-CO data. Based on the XPS and TPR-CO data the catalytic activity at low temperatures (<100 °C) was determined by a combination of both palladium surface structures PdOx(s)/Pd–O–Ce(s) and palladium ions Pd2+ in the PdxCe1−xO2−δ bulk phase.

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Keywords
Low-temperature CO oxidation; Pd/CeO2; Coprecipitation; XPS; TEM
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Low-temperature CO oxidation by Pd/CeO2 catalysts synthesized using the coprecipitation method
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 166–167, May 2015, Pages 91–103
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