Effect of Molar Ratio of Citric Acid to Metal Nitrate on the Structure and Catalytic Activity of NiO Nanoparticles

doi:10.1007/s40242-013-2059-1

Chemical Research in Chinese Universities ›› 2013, Vol. 29 ›› Issue (1): 154-158.doi: 10.1007/s40242-013-2059-1

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Effect of Molar Ratio of Citric Acid to Metal Nitrate on the Structure and Catalytic Activity of NiO Nanoparticles

WU Gang^1,2, TAN Xiao-yan^1,3, LI Gui-ying¹, HU Chang-wei¹

1. Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China;
2. Department of Basic Courses, Southwest Jiaotong University-E'mei, E'meishan 614202, P. R. China;
3. Institute of Applied Chemistry, Central South University of Forestry & Technology, Changsha 412006, P. R. China

Received:2012-02-17 Revised:2012-05-17 Online:2013-02-01 Published:2013-01-23
Supported by:
Supported by the National Natural Science Foundation of China(Nos.21021001, 20502017) and the Program for Changjiang Scholars and Innovative Research Team in Universities of China(No.0846).

Abstract

Abstract:

NiO nanoparticles were prepared by means of sol-gel method via varying the ratio of citric acid to nickel nitrate. The samples were characterized by powder X-ray diffraction(XRD), Fourier transform infrared(FTIR) spectroscopy, transmission electron microscopy(TEM) and X-ray photoelectron spectroscopy(XPS). It was found that the molar ratio of citric acid to nickel nitrate has a great effect on the crystal structure and particle size of NiO. The increase of the molar ratio of citric acid to nickel nitrate is favorable to the formation of NiO smaller particles within the range tested. Compared to bulk NiO obtained by thermal decomposition, NiO nanoparticles possess more surface oxygen species O^-. The activity test indicates that surface oxygen species O^- plays a crucial role in the hydroxylation of benzene to phenol with hydrogen peroxide as oxidant. The active site may be originated from Ni²⁺ on the surface of the samples, while Ni⁰ does not contribute to the hydroxylation reaction.

Key words: Nanostructure, Sol-gel growth, X-Ray diffraction, Surface property

WU Gang, TAN Xiao-yan, LI Gui-ying, HU Chang-wei. Effect of Molar Ratio of Citric Acid to Metal Nitrate on the Structure and Catalytic Activity of NiO Nanoparticles[J]. Chemical Research in Chinese Universities, 2013, 29(1): 154-158.

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Effect of Molar Ratio of Citric Acid to Metal Nitrate on the Structure and Catalytic Activity of NiO Nanoparticles

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