钛锆复合氧化物载体的制备、物化性质及在催化反应中的应用  

Preparation and Physico-chemical Properties of Titanium-Zirconium Mixed Oxide and Its Application as a Catalyst Support

作　　者：毛东森[1] 卢冠忠[2] 陈庆龄[1] 

机构地区：[1]中国石油化工股份有限公司上海石油化工研究院,上海201208 [2]华东理工大学工业催化研究所,上海200237

出　　处：《催化学报》2004年第6期501-510,共10页

摘　　要：TiO2 ZrO2 复合氧化物具有比TiO2 和ZrO2 更高的比表面积、更好的热稳定性和更强的表面酸碱性 ,作为催化剂载体已引起很大的研究兴趣并得到了重要的应用 .本文主要介绍了TiO2 ZrO2 复合氧化物载体的制备方法以及织构、结构和表面酸碱性等物化性质 。It is well known that the nature of supports play an important role in the catalytic performance of supported catalysts. The TiO 2-ZrO 2 binary oxide displays higher specific surface area and thermal stability than its individual TiO 2 and ZrO 2 components. Furthermore, the mixed oxide is found to exhibit high surface acidity by a charge imbalance based on the generation of Ti-O-Zr bonding. Thus, the combined TiO 2-ZrO 2 mixed oxide has attracted much attention recently as a catalyst support for various applications. In this paper, the preparation methods, and textural, structural and surface acidic and basic properties of TiO 2-ZrO 2 are introduced. The TiO 2-ZrO 2 mixed oxide is usually prepared by calcination of metal hydroxide, which can be prepared by co-precipitation, homogeneous precipitation and sol-gel methods. The XRD analysis reveals that the crystallization of the binary oxide is inhibited by the interaction of TiO 2 and ZrO 2, which explains the significant changes in its surface area, acidity and basicity. The preparation methods and conditions such as molar ratio of Ti/Zr and calcination temperature for TiO 2-ZrO 2 affect its physical and chemical properties. In the case of TiO 2-ZrO 2-supported catalysts, such changes can affect the electronic and geometric properties of active phases obtained and consequently the catalytic performance of the catalysts. Examples of the application of TiO 2-ZrO 2 as a catalyst support for various reactions such as selective catalytic reduction of NO x, hydrogenation, hydrodesulfurization and vapor phase Beckmann rearrangement of cyclohexanone oxime are reviewed and 85 references are cited.

关 键 词：二氧化钛 二氧化锆 复合氧化物 载体 表面酸性 表面碱性 

分 类 号：O643[理学—物理化学]