Effect of ZrO2 on the Structure of NiO/CeO2/γ-Al2O3 Composite Catalysts

doi:10.3724/SP.J.1077.2009.00187

Abstract

Abstract: Using Ni(NO₃)₂·6H₂O, Al(NO₃)₃·9H₂O，ZrOCl₂·8H₂O and Ce(NO₃)₃·6H₂O as raw materials, NiO/CeO₂/Al₂O₃ and NiO/CeO₂-ZrO₂/A₂O₃composite catalysts were prepared by co-precipitation method. Structures of the composite catalysts were investigated by X-ray diffraction (XRD), high resolution transmission electron microscope (TEM) and X-ray absorption near edge structure (XANES) spectroscope. Results indicate that NiO phase in NiO/CeO₂/γ-Al₂O₃catalysts disappears above 600℃ because it interact with γ-Al₂O₃to form NiAl₂O₄ spinel. However, no NiAl₂O₄ spinel is found in NiO/CeO₂-ZrO₂/Al₂O₃ catalysts annealed at 700℃ due to the formation of Zr_0.30Ce_0.45Al_0.25O_1.87 solid solution.

Key words: co-precipitation, NiO, NiAl₂O₄ spinel, Zr_0.30Ce_0.45Al_0.25O_1.87solid solution

CLC Number:

TB383

YANG Xiu-Chun,LU Zhen-Guang,KANG Xiao-Chun,WEI Ya-Nan. Effect of ZrO₂ on the Structure of NiO/CeO₂/γ-Al₂O₃ Composite Catalysts[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2009.00187.

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Effect of ZrO₂ on the Structure of NiO/CeO₂/γ-Al₂O₃ Composite Catalysts

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