稀土氧化物固体碱催化剂的表面性质Ⅰ．稀土氧化物表面活性中心的表征  

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

作　　者：赵雷洪[1] 郑小明[2] 费金华[2] 

机构地区：[1]浙江师范大学化学系 [2]杭州大学催化研究所

出　　处：《催化学报》1996年第3期227-231,共5页

基　　金：国家自然科学基金 浙江省自然科学基金

摘　　要：采用ＴＰＤ－ＭＳ，ＩＲ等技术研究了Ｌａ２Ｏ３，Ｙ２Ｏ３，Ｎｄ２Ｏ３，ＣｅＯ２及参照氧化物Ａｌ２Ｏ３，ＺｒＯ２，ＭｇＯ表面的酸碱性，氧活性及表面羟基．结果表明，上述稀土氧化物表面上不仅存在着两种碱中心，还有酸中心存在，且其表面都存在活性氧中心，表面的性质同碱土氧化物ＭｇＯ类似，但与Ａｌ２Ｏ３。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 3>Nd 2O 3>Y 2O 3>CeO 2, and the number of strong basic sites is in the order of Y 2O 3>La 2O 3>Nd 2O 3>CeO 2, but the strength of weak basic sites is Nd 2O 3>ZrO 2>Y 2O 3>CeO 2>La 2O 3, and the number is Y 2O 3>ZrO 2>La 2O 3>CeO 2>Nd 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.

关 键 词：稀土氧化物 镧 钇 钕 铈 催化剂 表面性质 

分 类 号：O643.361[理学—物理化学]