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Preparation and catalysis of amorphous CoNiB and polymer-stabilized CoNiB catalysts for hydrogenation of unsaturated aldehydes

Paper ID Volume ID Publish Year Pages File Format Full-Text
43001 45950 2008 10 PDF Available
Title
Preparation and catalysis of amorphous CoNiB and polymer-stabilized CoNiB catalysts for hydrogenation of unsaturated aldehydes
Abstract

CoNiB and polymer polyvinylpyrrolidone (PVP)-stabilized CoNiB (PVP-CoNiB) catalysts were prepared by chemical reduction with NaBH4. They were characterized and examined for their catalysis in the hydrogenation of unsaturated aldehydes. CoNiB and PVP-CoNiB catalysts were characterized by X-ray diffraction as amorphous structures and by transmission electron microscopy as having particle sizes in the range 3.5–7 nm – smaller than those of NiB (7–15 nm) and CoB (5–10 nm). CoNiB catalysts were significantly more active than NiB and CoB in the hydrogenations of furfural, crotonaldehyde and citral, and the PVP-CoNiB catalysts were significantly more active than CoNiB. The catalytic properties of CoNiB and PVP-CoNiB catalysts during the selective hydrogenations of crotonaldehyde and citral were similar to those of NiB, but different from those of CoB. The conjugated CC bonds in crotonaldehyde and citral were preferentially reduced to form butyraldehyde and citronellal. PVP-CoNiB could hydrogenate citral to citronellal at a low reaction temperature of 30 °C.

Graphical abstractThe CoNiB and PVP-stabilized CoNiB catalysts were prepared by chemical reduction with NaBH4. They were significantly more active than NiB and CoB in the hydrogenation of furfural, crotonaldehyde and citral. The most active catalyst PVP(2)-CoNiB(0.5) could selectively hydrogenate citral to citronellal at a low reaction temperature of 30 °C, with a good citronellal selectivity of about 86%. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Chemical reduction; Nanoparticle; CoNiB; Hydrogenation; Unsaturated aldehydes
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Preparation and catalysis of amorphous CoNiB and polymer-stabilized CoNiB catalysts for hydrogenation of unsaturated aldehydes
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 346, Issues 1–2, 31 August 2008, Pages 179–188
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