The role of Lewis acidic centers in stabilized zirconium dioxide

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• 作者：Teterycz ; Helena ; Klimkiewicz ; Roman ; Laniecki ; Marek
• 关键词：Zirconium dioxide ; Magnesium oxide ; Yttrium oxide ; Ketonization ; Lewis acidic centers ; Oxygen vacancy
• 刊名：Applied Catalysis A: General
• 出版年：2003
• 出版时间：August 28, 2003
• 年：2003
• 卷：249
• 期：2
• 页码：313-326
• 全文大小：361 K

文摘

The physico-chemical properties of ZrO₂, MgO and admixtured (stabilized) zirconium dioxide are presented. The synthesis of stabilized ZrO₂ was conducted in a low-temperature process. The catalysts obtained on the basis of zirconium dioxide were monophase materials of a regular structure. The lattice parameter of the materials did not differ much from the standard value. The character of the surface active centers was being changed as a result of the admixturing. Synthesized monophase materials of catalytic properties, Zr-Mg-O and Zr-Mg-Y-O, have many strong Lewis centers at surfaces. There appeared not only the stabilization of the regular polymorphous structure of ZrO₂, but also a modification of catalytic properties of the materials when the basic admixture (MgO and Y₂O₃) was being introduced to basic zirconium dioxide.