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Structural and electronic effects in bimetallic PdPt nanoparticles on TiO2 for improved photocatalytic oxidation of CO in the presence of humidity

Paper ID Volume ID Publish Year Pages File Format Full-Text
45732 46421 2015 12 PDF Available
Title
Structural and electronic effects in bimetallic PdPt nanoparticles on TiO2 for improved photocatalytic oxidation of CO in the presence of humidity
Abstract

•PdxPt1−x/TiO2 photocatalysts were prepared by direct chemical reduction of salts on TiO2.•Pt and Pd atoms were randomly distributed at the particle surface with no segregation.•Photocatalysts with x = 0.5 do not loose activity in CO conversion under UV in presence of humidity.•Structural and electronic effects in bimetallic PdPt nanoparticles were proposed.

Bimetallic PdxPt1−x/TiO2-P25 photocatalysts have been proven to maintain high activity for CO photocatalytic oxidation even under 50% relative humidity for 0.3 < x < 0.5 molar compositions, whereas humidity traces are highly detrimental when the reaction was performed over TiO2 supported monometallic particles. The catalysts were characterized by XPS, TEM, HAADF-STEM, TPR, CO-TPD and FTIR-CO adsorption characterization. The results suggested a random distribution of Pd and Pt atoms within the bimetallic nanoparticles, and in particular at their surface. It was proposed that the synergy observed in bimetallic PdxPt1−x/TiO2 may be explained by their modified electronic structure, playing a key role in overcoming the negative effects of humidity on the photocatalytic CO conversion. The behavior of PdxPt1−x/TiO2 under humid air was assumed to result from a preferential oxygen and water adsorption on surface Pt sites, leaving Pd sites free for CO adsorption, Pd being more resistant to oxidation than Pt in Pt-rich PtPd particles.

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Keywords
Photocatalytic CO oxidation; TiO2; Bimetallic PdxPt1-x nanoparticles; Structural and electronic effects; HAADF-STEM
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Structural and electronic effects in bimetallic PdPt nanoparticles on TiO2 for improved photocatalytic oxidation of CO in the presence of humidity
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 166–167, May 2015, Pages 381–392
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