【摘要】 以Ni(NO3)2.6H2O、Al(NO3)3.9H2O、ZrOCl2.8H2O和Ce(NO3)3.6H2O为原料,采用共沉淀法分别制备了NiO/CeO2/γ-Al2O3和NiO/CeO2-ZrO2/Al2O3催化剂.通过X射线衍射(XRD)、透射电子显微镜(TEM)和近边X射线吸收精细结构(XANES)等方法对催化剂的组成结构进行表征.结果表明,煅烧温度高于600℃时,NiO/CeO2/γ-Al2O3催化剂中的NiO与γ-Al2O3载体发生作用,形成NiAl2O4尖晶石;而NiO/CeO2-ZrO2/Al2O3催化剂中,NiO能够稳定存在,没有NiAl2O4尖晶石生成,且Al2O3与CeO2和ZrO2作用形成一种新的Zr0.30Ce0.45Al0.25O1.87固溶体.更多还原

【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/Al2O3 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/γ-Al2O3 catalysts disappears above 600℃ because it interact with γ-Al2O3 to form NiAl2O4 spinel.However,no NiAl2O4 spinel is found in NiO/CeO2-ZrO2/Al2O3 catalysts annealed at 700℃ due to the formation of Zr0.30Ce0.45Al0.25O1.87 solid solution.更多还原