Optimized Preparation of Fe₂O₃/Al₂O₃ Composite with Sol-Gel Combustion Synthesis Method Based on Orthogonal Experimental Design

Abstract:

Fe₂O₃/Al₂O₃ composite at the mass ratio of 3:2 was prepared by sol-gel combustion synthesis using urea as fuel. The optimized preparation parameters were determined by the robust orthogonal experimental design (OED) method. Standard L₉(3⁴) orthogonal array was adopted, and the four factors were determined as the molar ratio of oxidizer nitrates to fuel urea Ф, relative amount of the deionized water added R_w, ignition temperature and sintering temperature. Range analysis of the relative importance of those four factors on the mean weight loss rate for the reduction of synthesized Fe₂O₃/Al₂O₃ with 50 vol% H₂ indicated that the most influential factor was Ф, sintering temperature, R_w and ignition temperature in the descending order. And the optimized preparation parameters for Fe₂O₃/Al₂O₃ composite were Ф=1, R_w=7.5, ignition and sintering temperatures stabilized as 600°C and 950°C,respectively. Finally, the reaction characteristics of Fe₂O₃/Al₂O₃ prepared by SGCS and the other two reference methods (including sol-gel method and mechanical mixing method) were compared and the results verified that the optimized SGCS was the best option to synthesize Fe₂O₃/Al₂O₃ composite with good reaction performance.

• Periodical: Advanced Materials Research (Volumes 341-342)
• Pages: 215-220
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.341-342.215
• Online since: September 2011
• Authors: Bao Wen Wang, Chuan Chang Gao, Hai Bo Zhao, Chu Guang Zheng
• Keywords: Fe₂O₃/Al₂O₃ Composite, Orthogonal Experimental Design (OED), Sol-Gel Combustion Synthesis

References

[1] Liu, M., Li,H.B., Li,X., Yu,W.X., Lu,Y., Zhao, Z.D. XRD and Mossbauer spectroscopy investigation of Fe2O3-Al2O3 nano-composite [J]. Journal of Magnetism and Magnetic Materials 2005, 294(3): 294-297.

DOI: 10.1016/j.jmmm.2004.12.026

[2] Prieto, M.D.C., Amores, J.M.G., Escribano, V.S., Busca, G. Charaterization of coprecipitated Fe2O3-Al2O3 powders [J]. Journal of Materials Chemistry 1994, 4(7): 1123-1130.

[3] Tartaj, P., Tartaj, J. Preparation, characterizaiton and sintering behavior of spherical iron oxide doped alumina particles [J]. Acta Materialia, 2002, 50(1): 5-12.

DOI: 10.1016/s1359-6454(01)00336-6

[4] Erri, P., Pranda,P., Varma, A. Oxidizer-fuel interactions in aqueous combustion synthesis. 1. iron(III) nitrate-model fuels. [J]. Industrial Engineering Chemistry Research, 2004, 43(12): 3092-3096.

DOI: 10.1021/ie030822f

[5] Zhao, H.B., Liu L.M., Wang, B.W., Xu, D., Jiang, L.L., Zheng C.G. Sol-gel-derived NiO/NiAl2O4 oxygen carrier for chemical looping combustion by coal char. [J]. Energy and Fuels, 2008, 22(2): 898-905.

DOI: 10.1021/ef7003859