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Citation: ZHANG Xiao-Hong, HU Rui-Sheng, LI Yu-Fen, LI Chang-Yan. Synthesis and Characterization of Rare-earth Hexaaluminate Catalysts Prepared by Reverse Microemulsion Method[J]. Chinese Journal of Applied Chemistry, ;2005, 22(11): 1178-1181. shu

Synthesis and Characterization of Rare-earth Hexaaluminate Catalysts Prepared by Reverse Microemulsion Method

1.
College of Chemistry and Chemical Engineering, Inner Mongolia University, Key Laboratory of Rare Earth Materials, Hohhot 010021

Received Date: 16 December 2004
Available Online: 22 July 2005
Fund Project: 国家自然科学基金(20163001) (20163001)内蒙古自然科学基金(200408020203) (200408020203)

The Fe-doped,Co-doped and no-doped hexaaluminate catalysts were prepared by the reverse microemulsion method in the system of water/Triton X-100/n-butoanol/cyclohexane.The effects of doping elements on phase,specific surface area and activity for methane combustion were investigated by means of XRD,BET,H₂-TPR.The XRD and TPR results indicate that a single phase LaFeAl₁₁O₁₉ hexaaluminate was formed according to the XRD spectrum of Fe-doped hexaaluminate catalyst,but XRD spectrum analyses of Co-doped and no-doped catalysts indicated that hexaaluminate was dominated phase and accompanied with a few perovskite phase when calcined at 1 400℃ for 3 h.H₂-TPR patterns of the Fe-doped and Co-doped catalysts show that the reduction peaks appear in the range of 400℃ and 800℃,while no reduction peaks appear for no-doped catalyst.Reverse microemulsion method is beneficial to maintaining high surface area.The specific surface areas of prepared catalysts are about 11.6~16.3 m²/g.Compared with no-doped catalyst,the high-temperature activity of Fe-doped and Co-doped catalysts increased obviously,which made methane conversion 50% below 700℃ and methane complete conversion temperature was 800℃.However,the high-temperature activity of Fe-doped catalyst is better than that of Co-doped catalyst within 700℃,and their high-temperature activities are almost the same over 700℃.Fe-doped catalyst formed a single phase of hexaaluminate LaFeAl₁₁O₁₉ and had a higher activity for methane combustion.It might be a candidate for catalytic gas turbine combustor.
- reverse microemulsion method,
- methane,
- hexaaluminate,
- transition-metal,
- rare-earth
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