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Thin layer of carbon-nano-fibers (CNFs) as catalyst support for fast mass transfer in hydrogenation of nitrite

Paper ID Volume ID Publish Year Pages File Format Full-Text
41993 45907 2010 9 PDF Available
Title
Thin layer of carbon-nano-fibers (CNFs) as catalyst support for fast mass transfer in hydrogenation of nitrite
Abstract

CNF-foam ‘hairy foam’ and CNF aggregates supported Pd catalysts were studied for the reduction of aqueous nitrite solution and also compared with conventional catalysts. Relatively large Pd particle size and similar Pd particle size distribution on all the catalyst supports excludes any structure sensitive effects on reaction. Intrinsic rates over hairy foam catalysts were independent of CNF-layer thickness (8–28 μm) and Pd loading (0.5–2 wt%), demonstrating the absence of any mass transfer limitations. When compared to conventional catalysts at comparable diffusion layers, CNF based catalysts showed at least three times higher rates of nitrite conversion per mole of surface palladium (TOF). Increased TOF is due to the improved mass transfer provided by macroporous structure of the entangled CNFs, which offers low tortuosity, provides accessibility to all the active sites. The intrinsic activity of graphite and CNF-supported Pd contributes significantly to the high activity for nitrite reduction.

Graphical abstractReduction of nitrite in aqueous solution was studied over CNF-supported Pd catalysts and compared with conventional supports with similar diffusion-lengths. It appears that CNF based catalysts are at least three times more active per surface area of palladium, which is due to improved mass transfer as well as due to apparent enhancement intrinsic activity.Figure optionsDownload full-size imageDownload high-quality image (193 K)Download as PowerPoint slide

Keywords
Carbon-nano-fibers; Nitrite reduction; Structured catalysts
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Thin layer of carbon-nano-fibers (CNFs) as catalyst support for fast mass transfer in hydrogenation of nitrite
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 383, Issues 1–2, 31 July 2010, Pages 24–32
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