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Enhanced activity for CO oxidation over Pd/Al2O3 catalysts prepared by atmospheric-pressure cold plasma

Paper ID Volume ID Publish Year Pages File Format Full-Text
53957 46990 2015 5 PDF Available
Title
Enhanced activity for CO oxidation over Pd/Al2O3 catalysts prepared by atmospheric-pressure cold plasma
Abstract

•Pd/Al2O3 catalysts were fabricated by atmospheric-pressure dielectric barrier discharge cold plasma.•The influences of the Pd precursors on the Pd/Al2O3 catalysts were investigated.•Pd/Al2O3 catalysts fabricated by the fast and facile plasma method using Pd(NO3)2 as Pd precursor exhibited enhanced CO oxidation activity.•The promoted activity may be attributed to the small size of the Pd nanoparticles and the chemisorbed oxygen species.

Atmospheric-pressure dielectric barrier discharge (DBD) cold plasma was employed to prepare Pd/Al2O3 catalysts by simple incipient wetness impregnation using Pd(NO3)2 and PdCl2 as precursors, respectively. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), temperature-programmed reduction (TPR) and N2 adsorption–desorption measurement were used to characterize the Pd/Al2O3 catalysts. CO catalytic oxidation reaction was adopted to investigate the activity of the catalysts. The activity for the Pd/Al2O3 samples prepared by cold plasma using the same Pd precursor was higher than that prepared by thermal reduction method, which indicated that cold plasma is an efficient method for preparing high-performance Pd/Al2O3 catalysts. The results also showed that the Pd/Al2O3 catalysts prepared using Pd(NO3)2 as precursor possess smaller size of Pd nanoparticles, and most of the Pd nanoparticles were distributed on the surface of the Al2O3 support. In addition, a certain amount of chemisorbed oxygen species were detected on the surface of Al2O3 support due to the oxygen-containing Pd precursor. Therefore, they exhibited significantly enhanced activity for CO oxidation than that prepared using PdCl2 as Pd precursor. Atmospheric-pressure DBD cold plasma is a fast and facile method (just 6-min reduction) for fabricating high-performance Pd/Al2O3 catalysts using Pd(NO3)2 as Pd precursor.

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Keywords
Atmospheric-pressure cold plasma; Dielectric barrier discharge (DBD); Pd/Al2O3; PdCl2; Pd(NO3)2; CO oxidation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 256, Part 1, 1 November 2015, Pages 148–152
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