锆
立方氧化锆
煅烧
X射线光电子能谱
材料科学
苯
吸附
路易斯酸
无机化学
傅里叶变换红外光谱
吡啶
化学工程
化学
催化作用
有机化学
复合材料
陶瓷
工程类
作者
Arnaldo C. Faro,Kátia R. de Souza,Vera Lúcia Doria Camorim,Mauri B. Cardoso
摘要
Materials containing 2–20 wt% zirconia supported on γ-alumina were prepared by multiple step incipient wetness impregnation with solutions of zirconium acetylacetonate in benzene. The materials were calcined at 823 K and were characterised by X-ray diffraction, XPS, DRS in the UV-visible region and FTIR in the regions of OH stretching and skeletal vibrations of adsorbed pyridine. The results demonstrated that the zirconium is present as isolated species at the surface and in the bulk of a mixed zirconia–alumina phase formed by migration of the zirconium ions into the subsurface layers of the support. The presence of zirconia at the alumina surface caused the appearance of basic hydroxyl groups bonded to a single zirconium ion, of weak Lewis acidic sites, probably associated with zirconium sites, and a decrease in concentration of stronger Lewis sites associated with the alumina surface.
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