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Effect of ZrO2 on the Structure of NiO/CeO2/¦|/EM>-Al2O3 Composite Catalysts

Author(s): YANG Xiu-Chun,LU Zhen-Guang,KANG Xiao-Chun,WEI Ya-Nan

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 24;
Issue: 1;
Start page: 187;
Date: 2009;
Original page

Keywords: co-precipitation | NiO | NiAl2O4 spinel | Zr0.30Ce0.45Al0.25O1.87ªªsolid solution

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/A2O3 composite 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/¦|/EM>-Al2O3 catalysts disappears above 600¡䟢ecause it interact with ª«¦|/EM>-Al2O3 to form NiAl2O4 spinel. However, no NiAl2O4 spinel is found in NiO/CeO2-ZrO2/Al2O3 catalysts annealed at 700¡䟤ue to the formation of Zr0.30Ce0.45Al0.25O1.87ªª solid solution.