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Preparation of NiB nanoparticles in water-in-oil microemulsions and their catalysis during hydrogenation of carbonyl and olefinic groups

Paper ID Volume ID Publish Year Pages File Format Full-Text
43984 45998 2007 9 PDF Available
Title
Preparation of NiB nanoparticles in water-in-oil microemulsions and their catalysis during hydrogenation of carbonyl and olefinic groups
Abstract

Surfactant-stabilized NiB catalysts (ME-NiB) were prepared using the chemical reduction method in the ternary microemulsion system of water/cetyl-trimethyl-ammonium bromide (CTAB)/n-hexanol. The surfactant molecules could adsorb onto the surface of the formed particles, and acted as a protective agent to stabilize and restrict the growth of particles. The size of the nanoparticles was not fully determined by the size of the microemulsion droplets, which depended on the composition of the microemulsion system. Additionally, the particle sizes and the reactivities of the ME-NiB nanoparticles depended on the concentration of nickel salt, the amount and speed of addition of NaBH4 and the temperature. The ME-NiB samples were characterized by X-ray diffraction (XRD) as an amorphous structure and by transmission electron microscopy (TEM) as having particle size distributions in the range 3–8 nm, which was much smaller than that of NiB (20–50 nm) prepared by the typical chemical reduction method. The ultrafine catalyst of ME-NiB was markedly more active than NiB in the hydrogenation of carbonyl and olefinic groups. A good yield of citronellal/citronellol was obtained from the selective hydrogenation of citral at a low temperature of 30 °C over the ME-NiB catalyst.

Graphical abstractThe surfactant-stabilized nanoparticles (3–4 nm) of NiB (ME-NiB) were prepared by reducing nickel acetate with sodium borohydride in the water/CTAB/n-hexanol microemulsion system. The ME-NiB catalysts were characterized as amorphous and markedly more active than NiB prepared by the typically chemical reduction method. The ME-NiB catalysts could selectively hydrogenate citral to obtain citronellal yield about 84% and citronellal/citronellol yield about 95% at a low temperature of 30 °C. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Chemical reduction; Microemulsion; NiB; Nanoparticle; Hydrogenation; Butyraldehyde; Furfural; Crotonaldehyde; Citral
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Preparation of NiB nanoparticles in water-in-oil microemulsions and their catalysis during hydrogenation of carbonyl and olefinic groups
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 319, 1 March 2007, Pages 144–152
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