fulltext.study @t Gmail

Identification of active sites for CO and CH4 oxidation over PdO/Ce1−xPdxO2−δ catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
46643 46444 2012 6 PDF Available
Title
Identification of active sites for CO and CH4 oxidation over PdO/Ce1−xPdxO2−δ catalysts
Abstract

A PdO/Ce1−xPdxO2−δ catalyst containing surface PdOx (x = 1–2) species and Ce1−xPdxO2−δ solid solution was prepared by a solution combustion method. It was found that the surface PdOx species could be removed by nitric acid treatment. Also, partial Pd4+ cations in the CeO2 lattice migrated to the surface to form surface PdOx species after high temperature calcination (500 °C). The catalyst was tested for catalytic CO and CH4 oxidation. For CO oxidation, the specific reaction rate of the surface PdOx species (673.4 μmolCO gPd−1 s−1) was 249 times as high as that of the Ce1−xPdxO2−δ solid solution (2.7 μmolCO gPd−1 s−1), due to the fact that the surface PdOx species provided CO chemisorption sites. While for CH4 oxidation, the specific reaction rate of the Ce1−xPdxO2−δ solid solution (7.5 μmolCH4 gPd−1 s−1) was higher than that of the PdO/Ce1−xPdxO2−δ catalyst (2.8 μmolCH4 gPd−1 s−1), due to the covered Ce1−xPdxO2−δ surface by surface PdOx species.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► PdO/Ce1−xPdxO2−δ contains surface PdOx (x = 1–2) and Ce1−xPdxO2−δ solid solution. ► Surface PdOx are more active for CO oxidation than Pd4+ cations in Ce1−xPdxO2−δ. ► Pd4+ cations in Ce1−xPdxO2−δ are more active for CH4 oxidation than surface PdOx. ► A portion of Pd4+ in Ce1−xPdxO2−δ transform to surface PdOx at high temperature.

Keywords
PdOx species; Ce1−xPdxO2−δ solid solution; Active site; Specific reaction rate; Acid treatment
First Page Preview
Identification of active sites for CO and CH4 oxidation over PdO/Ce1−xPdxO2−δ catalysts
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
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 119–120, 30 May 2012, Pages 117–122
Authors
, , , , , , , ,
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