Catalytic Behavior of Nickel Nanoparticles Stabilized by Lower Alkyl Ammonium Bromide in Aqueous Medium

Singla, M.L. and Negi, Anjali and Mahajan, Vikram and Singh, K.C. and Jain, D.V.S. (2007) Catalytic Behavior of Nickel Nanoparticles Stabilized by Lower Alkyl Ammonium Bromide in Aqueous Medium. Applied Catalysis A:General , 323. pp. 51-57. ISSN 0926-860X

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Abstract

Heterogeneous synthesis of monodisperse pure nickel nanoparticles in aqueous medium has been carried out using cetyltrimethylammonium bromide and a lower alkylammonium bromide mixture of tetraethylammonium bromide and tetrabutylammonium bromide. The presence of cetyltrimethylammonium bromide alone results in the formation of a mixture of nickel hydroxide and nickel nanoparticles. The particles have been characterized using TEM, EDS, XRD, TGA-DSC and FTIR. The analysis showed that particles are spherical in shape, monodisperse, face-centered-cubic with average size about 15 nm and are stable in air up to 325 °C. The nanoparticles have been used as a solid phase catalyst for the reduction ofp-nitrophenol in the presence of hydrazine hydrate as reducing agent at different temperatures under varying conditions. The reduction process has been monitored by UV-vis analysis. The present study showed that nanoparticles are not poisoned after their repeated use in reduction of p-nitrophenol to p-aminophenol. TEM analysis also confirms that nanoparticles are stable in the dispersed medium for longer times.

Item Type: Article
Uncontrolled Keywords: Nickel nanoparticles; Lower alkylammonium bromide; Aqueous medium; p-Nitrophenol; Catalysis; p-Aminophenol
Subjects: CSIO > Chemistry
Depositing User: Ms. Narinder Kaur
Date Deposited: 09 Mar 2012 15:55
Last Modified: 09 Mar 2012 15:55
URI: http://csioir.csio.res.in/id/eprint/100

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