Preparation of NiO/MgO Nanoparticles Catalysts by
Heat Treatment of a Novel Molecular Chain Containing
Ni(II), Mg(II) and Oxamate Ligand
Rodrigues T. S.1, Nascimento D.R.1, Souza G. P.1, Stumpf H. O.2, Dias A.1, Nuernberg G.
B.3, Fajardo H. V.1
1
Universidade Federal de Ouro Preto, Campus Morro do Cruzeiro, MG, Brazil
Depto. de Química, ICEx, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brasil.
3
Depto. de Química, Universidade Federal de Santa Catarina, Florianópolis, SC, Brasil
2
The development of oxide-supported metal catalysts is very important due to their use in a
wide variety of reactions such as, hydrogenation, dehydrogenation, oxidation and
isomerization1. In this work the novel molecular chain, MgNi(opba)·9H2O (1), opba =
ortho-phenylenebis(oxamato)2, was synthesized and characterized by elemental analysis,
thermal analysis and IR spectroscopy. The compound (1) was heat treated at 800oC for 5 h
resulting in NiO/MgO (2) nanoparticles characterized by elemental analysis, Raman
spectroscopy, X-raydiffraction and transmission electron microscopy (TEM). The analysis
of X-ray diffractionof 2 shows the presence of NiO/MgO nanoparticles with an average
diameter of 35 nm. The catalytic properties of 2 were evaluated in the catalytic
decomposition of methane and ethanol. The catalyst was active in the proposed reactions.
The analyses after the catalytic tests indicated the presence of single-walled nanotubes
(SWNTs), multiwalled nanotubes (MWNTs) and carbon onion (Figure 1).
Fig. 1. TEM images of the catalyst: (a) before and (b and c) after the CH4 decomposition
reaction.
The preliminary results indicated that the heat treatment of a extended and organized
compound, in this case the chain [MgNi(opba)]·9H2O, may be important in the preparation
of oxide-supported metal catalysts.
Keywords: Nanoparticles of NiO / MgO, oxide-supported metal catalysts, molecular chain.
Work supported by CNPQ and Fapemig.
[1] Rostrup-Nielsen, J. R. Journal of Catalysis 1984, 85, 31.
[2] Souza, G. P.; Konzen, C.; Ardisson, J. D.; De Abreu, H. A.; Duarte, H. A.; Alcantara, A.
F. C.; Nunes, W. C.; Macedo, W. A. A.; Knobel, M.; Stumpf, H. O. Journal of the Brazilian
Chemical Society 2006, 17, 1534.
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