Preparation of CoFe₂O₄ Nanocrystallite by Sol-Gel Combustion Synthesis and Evaluation of its Reaction Performance

Abstract:

Sol-gel combustion synthesis method was adopted to prepare nano-sized CoFe₂O₄ using urea as fuel. The as-synthesized CoFe₂O₄ powders were characterized through such experimental means as Fourier transform infrared spectroscopy (FTIR), TG (thermogravimetric)–DSC (differential scanning calorimetry), X-ray diffraction (XRD), field-scanning electron microscopy (FSEM). FTIR analysis and XRD analysis revealed that the dried CoFe₂O₄ gel was formed by the coordination of metal with O, and consisted of various phases through the hydrolysis of urea and metal nitrates along with the coordination of the various groups produced. And then, TG-DSC analysis of the dried CoFe₂O₄ gel under air atmosphere indicated that there are two remarkable exothermic reactions occurring, related to the redox reactions between urea and nitrates used, and as-synthesized CoFe₂O₄ was porous due to the emission of large amount of gases during preparation. Finally, three cycles of temperature-programmed reduction (TPR) coupled with temperature-programmed oxidization (TPO) tests were conducted on the AutoChem 2920 system to show the good reaction and sintering-resistance performance for the synthesized CoFe₂O₄.

• Periodical: Advanced Materials Research (Volumes 341-342)
• Pages: 63-67
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.341-342.63
• Online since: September 2011
• Authors: Bao Wen Wang, Chuan Chang Gao, Hai Bo Zhao, Chu Guang Zheng
• Keywords: CoFe₂O₄, Reaction Performance, Sol-Gel Combustion Synthesis

References

[1] S.H. Xiao, W.F. Jiang, L.Y. Li, X.J. Li: Low-temperature auto-combustion synthesis and magnetic properties of cobalt ferrite nanopowder. Materials Chemistry and Physics Vol. 106(2007),P. 82-87.

DOI: 10.1016/j.matchemphys.2007.05.021

[2] N. Ballarini, F. Cavani, S. Passeri, L. Pesaresi, A.F. Lee, K. Wilson. Phenol methylation over nanoparticulate CoFe2O4 inverse spinel catalysts: The effect of morphology on catalytic performance. Applied Catalysis A: General Vol. 366(2009).

DOI: 10.1016/j.apcata.2009.07.003

[3] A. Khan, P. Chen, P. Boolchand, P.G. Smirniotis. Modified nano-crystalline ferrites for high-temerature WGS membrane reactor applications. Journal of Catalysis Vol. 253(2008) P. 91-104.

DOI: 10.1016/j.jcat.2007.10.018

[4] M.H. Khedr, A.A. Omar, S.A. Abdel-Moaty. Reduction of carbon dioxide into carbon by freshly reduced CoFe2O4 nanoparticles. Materials Science and Engineering A Vol. 432(2006) P. 26-33.

DOI: 10.1016/j.msea.2006.06.012

[5] L.J. Ma, L.S. Chen, S.Y. Chen. Studies on redox H2-CO2 cycle on CoCrxFe2-xO4. Solid State Sciences Vol. 11(2009) P. 176-181.

DOI: 10.1016/j.solidstatesciences.2008.05.008

[6] R. Keuleers, G.S. Papaefstathiou, C.P. Raptopoulou, S.P. Perlepes H.O. Desseyn. Comparative study of the metal-ligand bond strength in MnII/X/U complexes (X=Cl, Br, I; U=urea). Journal or Molecular Structures Vol. 525(2000) P. 173-183.

DOI: 10.1016/s0022-2860(00)00408-7

[7] Y. Qiu, L. Gao. Metal-urea complex- a precursor to metal nitrides. Journal of Americal Ceramic Society Vol. 87(2004) P. 352-357.

DOI: 10.1111/j.1551-2916.2004.00352.x

[8] N. Kasapoğlu, A. Baykal, Y. Köseoğlu, M.S. Toprak. Microwave-assisted combustion synthesis of CoFe2O4 with urea, and its mantiec characterization. Scripta Materialia Vol. 57 (2007) P. 441-444.

DOI: 10.1016/j.scriptamat.2007.04.042

[9] D.R. Sharma, R. Mathur, S.R. Vadera, N. Kumar, T.R.N. Kutty. Synthesis of nanocomposites of Ni-Zn ferrite in aniline formaldehyde copolymer and studies on their pyrolysis products. Journal of Alloys and Compounds Vol. 358(2003) P. 193-204.

DOI: 10.1016/s0925-8388(03)00034-3