共沉淀CuO-ZrO_2复合氧化物分散态结构研究

Studies on the Dispersion Structure of Co-precipitated CuO-ZrO_2 Mixed Oxides

用XRD、EXAFS、XPS表征了共沉淀法制备的CuO-ZrO2复合氧化物的分散态结构.500℃焙烧的样品在一定组成范围内形成大体均匀的无定形态固溶体.CuO含量超过其在ZrO2中溶解度时,多余的CuO以CuO晶体形式存在;当ZrO2含量超过其在CuO中溶解度时,多余的ZrO2以四方相ZrO2晶体形式存在.焙烧温度达到800℃时,样品由单斜相ZrO2和CuO晶体组成.

Co-precipitated CuO-ZrO2 mixed oxides were characterized by XRD, EXAFS, XPS methods. For the samples calcined at 500degreesC, amorphous solid solution forms between CuO and ZrO2 in the co-precipitated samples. The extra CuO crystal exists if CuO is more than its solubility in ZrO2, and extra tetragonal ZrO2 crystal exists if ZrO2 content is more than its solubility in CuO. After calcined at 800degreesC, the samples compose of monoclinic ZrO2 and CuO crystals.