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Influence of organic additives on the properties of impregnation solutions and on nickel oxide particle size for Ni/Al2O3 catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
54698 47020 2014 6 PDF Available
Title
Influence of organic additives on the properties of impregnation solutions and on nickel oxide particle size for Ni/Al2O3 catalysts
Abstract

•Sorbitol, glucose and citric acid are introduced as additives in impregnation solutions.•The main role played by these additives is to increase the solution viscosity.•In solution, the additives do not behave as stable ligands toward Ni2+ ions.•Crystallization of the precursor salt and formation of larger NiO nanoparticles are inhibited.•The reducibility of smaller nanoparticles compares well with reference Ni/Al2O3 catalyst.

The introduction of organic additives, such as polyols, sugars or polyacids, in impregnation solutions has been suggested to better control the size of nanoparticles on supported catalysts. The present paper focuses on the roles played by three of these additives, sorbitol, glucose and citric acid, in the preparation of Ni/Al2O3 catalysts. ATR-IR, circular dichroism spectroscopy and viscosity measurements show that the additives act as modifiers of the physical properties of the solutions, by increasing their viscosity via hydrogen bonding, rather than as stable ligands toward Ni2+ ions. Recrystallization of the nickel precursor salt is prevented upon drying. As a consequence, no population of large particles is evidenced by XRD and TPR on the catalysts prepared with additives, unlike reference catalysts prepared by conventional impregnation of nickel nitrate. Adding these organic molecules in the impregnation solution is thus an easy way to narrow the size distribution of NiO nanoparticles without significantly affecting their reducibility.

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Keywords
Sorbitol; Glucose; Citric acid; ATR-IR; Circular dichroism; Viscosity
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Influence of organic additives on the properties of impregnation solutions and on nickel oxide particle size for Ni/Al2O3 catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 235, 15 October 2014, Pages 250–255
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