铈对SO_4^(2-)/TiO_2/Al-PILC固体超强酸改性的研究  

Studies on Solid Superacid SO_4^(2-)/TiO_2/Al-PILC Modified by Ce

作　　者：蒋月秀[1] 郭尚伟[1] 张雪[1] 童张法[1] 

机构地区：[1]广西大学化学化工学院,广西南宁530004

出　　处：《稀土》2006年第2期12-14,21,共4页Chinese Rare Earths

基　　金：广西"十百千人才工程"专项基金项目资助(2000228)

摘　　要：用铈对固体超强酸SO42-/T iO2/铝交联膨润土(SO42-/T iO2/A l-P ILC)进行改性,制备了C e-SO42-/T iO2/A l-P ILC稀土超强酸,并采用XRD、低温N2吸附法及吡啶吸附红外等方法对其进行了结构、表面性能及酸性的表征。实验结果表明,铈引人SO42-/T iO2/A l-P ILC超强酸对T iO2锐钛矿晶相的形成没有影响,但对锐钛矿晶相向金红石相的转变有促进作用,铈的引人使催化剂的酸强度及酸中心的数量略有下降,铈能有效地减少催化剂表面SO42-的流失量,从而提高了催化剂的活性稳定性。The rare earth solid superacid catalyst SO4^2-/TiO2Al-PILC was prepared by modifying SO4^2-/ TiO2/Al-PILC with Ce element. The structure,surface property and acidity properties of the catalyst were studied by XRD, the adsorption of N2 and FT-IR spectrum of absorbed pyridine technique. The results indicate that Ce has no effect on the formation of anatase TiO2, but it promotes the transformation of anatase TiO2 into rutile TiO2. Ce slightly decreases acid strength and the number of acid sites of catalyst, Ce can effectively inhibit the loss of SO4^2- in catalyst and improve activity stability of catalyst.

关 键 词：稀土 固体超强酸 催化剂 

分 类 号：O643.36[理学—物理化学] O614.33[理学—化学]