新型HPW/SiO_2复合介孔材料的合成与表征  

Synthesis and Characterization of a New Mesoporous HPW/SiO_2 Composite Material

作　　者：史春风[1] 辛明红[1] 王润伟[1] 谢亚茹[1] 胡磊[1] 徐玲[1] 张荣梅[2] 朱广山[2] 裘式纶[2] 

机构地区：[1]吉林大学化学学院无机合成与制备化学国家重点实验室,长春130012 [2]吉林大学化学学院

出　　处：《高等学校化学学报》2005年第7期1198-1201,M003,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:29873017;20101004);国家重大基础研究项目(批准号:G2000077507)资助.

摘　　要：合成了一种新型的HPW/S iO2复合介孔材料,通过XRD,TEM,UV-V is和FT IR等表征证明,HPW均匀且稳定地包藏到介孔材料由S iO2网络组成的孔壁之中.催化结果表明,其在大分子催化反应中有较高的活性,在酯化反应中连续循环使用未发现活性组分流失,表明其在多相催化和大分子催化反应中有较好的工业应用前景.A new mesosilica-encapsulated Keggin type heteropolyacid-HPW/SiO_2 was synthesized by adding HPW into a sol-gel system to form mesoporous silica involving hydrolysis of tetraethyl orthosilicate under the strong acidic synthesis conditions(pH<0). The mesosilica-impregnated -{heteropolyacid-} thus synthesized are insoluble and readily separable mesoporous composite materials with uniform mesopores and high specific surface areas. Their structures and physical-chemical properties was characterized by various methods, their catalytic activity were measured by the cracking of cumene and 1,3,5-triisopropylbenzene, and esterification reactions of acetic acid with ethanol and benzoic acid with t-butanol. The results show that the HPW is tightly encapsulated into the network of mesosilica walls and does not leach from the walls of mesosilica. The HPW/SiO_2 composite materials are the promising and new catalysts for acid-catalytic reactions, and the potential replacer of the homogenous reaction catalysts to solve the separation and recycle problems.

关 键 词：SBA-15 磷钨杂多酸 包藏 复合材料 大分子催化 

分 类 号：O641[理学—物理化学]