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Nitrite reduction over Pd supported CNFs: Metal particle size effect on selectivity

Paper ID Volume ID Publish Year Pages File Format Full-Text
55422 47052 2012 5 PDF Available
Title
Nitrite reduction over Pd supported CNFs: Metal particle size effect on selectivity
Abstract

Pd catalysts supported on carbon-nano-fibers (CNFs) were synthesized via Pd colloids stabilized with polyvinyl-alcohol (PVA). Pd catalysts with narrow particle size distributions and mean Pd sizes between 2.6 and 30 nm were immobilized on CNFs. Characterization with CO-chemisorption and transmission electron microscopy (TEM) revealed that a significant part of the Pd surface is blocked by the polymer layer on the Pd particles. The prepared catalysts were tested for nitrite reduction in water, resulting in formation of nitrogen and ammonia. Turn over frequencies were found to be independent of Pd particle size while selectivity to ammonia clearly decreased with increasing Pd particle size.

Graphical abstractParticle size effect on activity and selectivity in nitrite hydrogenation; Pd particles partly covered with PVA.Figure optionsDownload full-size imageDownload high-quality image (144 K)Download as PowerPoint slideHighlights► The selectivity of nitrite hydrogenation shifts to ammonia with increasing Pd–PVA particle size. ► The activity of Pd particles for nitrite hydrogenation is seriously affected by the presence of PVA. ► The activity per Pd surface atom (TOF) seems independent of particle size. ► The TOF on Pd–PVA appears higher as compared to bare Pd nano-particles.

Keywords
Palladium; PVA; Nitrite-hydrogenation; Particle-size-effect
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Nitrite reduction over Pd supported CNFs: Metal particle size effect on selectivity
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 183, Issue 1, 20 March 2012, Pages 119–123
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