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SURFACE PROPERTIES OF RARE EARTH OXIDE SOLID BASE CATALYSTS Ⅰ. Characterization of Surface Active Sites of Rare Earth Oxide Catalysts

Zhao Leihong (Department of Chemistry, Zhejiang Normal University, Jinhua 321004) Zheng Xiaoming, Fei Jinhua [WT5”BX](Catalysis Institute, Hangzhou University, Hangzhou 310028)  
The properties of surface acidity basicity, oxygen mobility and surface hydroxyl of several rare earth oxide catalysts (Y 2O 3, La 2O 3, CeO 2, Nd 2O 3) were studied by means of the techniques of IR and TPD MS. The results show that there are many quite strong basic sites and a few acidic sites on the surface of rare earth oxides. The strength of strong basic sites is in the order of La 2O 3Nd 2O 3Y 2O 3CeO 2, and the number of strong basic sites is in the order of Y 2O 3La 2O 3Nd 2O 3CeO 2, but the strength of weak basic sites is Nd 2O 3ZrO 2Y 2O 3CeO 2La 2O 3, and the number is Y 2O 3ZrO 2La 2O 3CeO 2Nd 2O 3. There are two acidic sites on Nd 2O 3, a strong acidic site on Y 2O 3, a middle acidic site on La 2O 3, and almost no acidic site on CeO 2. There are two acidic sites on ZrO 2, one is strong and the other is middle. The TPD peak of oxygen adsorbed on La 2O 3, Nd 2O 3, Y 2O 3 appeared at 395℃, 295℃ and 445℃, respectively, which means those rare earth oxides have oxygen mobility and can transmit oxygen when oxygen is present.
【Fund】: 国家自然科学基金 浙江省自然科学基金
【CateGory Index】: O643.36
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