硅钨系列三元杂多阴离子柱撑水滑石的合成、表征及其酸碱催化性能  

Synthesis, Characterization and Acid-Base Properties of Layered Double Hydroxides Pillared with Tungstosilicate Anions

作　　者：郭军[1] 孙铁[1] 沈剑平[1] 刘丹[1] 蒋大振[1] 闵恩泽[1] 

机构地区：[1]吉林大学化学系,石油化工科学研究院

出　　处：《高等学校化学学报》1995年第3期346-350,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金

摘　　要：从ＮＯ_３－ＬＤＨ出发，通过直接交换反应合成了具有Ｋｅｇｇｉｎ结构的杂多阴离子ＳｉＷ_（１１）Ｍ·（Ｈ_２Ｏ）Ｏ　（Ｍ为第一系列过渡金属）柱撑水滑石，用元素分析、ＸＲＤ、ＩＲ和ＤＴＡ对产物的组成和结构进行了表征。结果表明，杂多阴离子进入水滑石层间，使水滑石的层间距从０．９２ｎｍ增加到１．４７ｎｍ，且热稳定性有所提高。柱撑产物在异丙醇反应中表现出酸碱双功能催化作用，但酸催化占明显优势。Layered double hydroxides(LDHs) pillared with heteropolyanions,SiW_(11)M·(H_2O)O (Mis the first row transition metals),were synthesized by means of direct ion-exchange reaction and were characterized by elementary analysis,XRD,IR and DTA.The results show that the interlayer space of the pillared products increase from 0.92 nm to 1.47 nm,and there is an increase in the thermal stability of the pillared product with the heteropolyanion intercalating into the LDH. The pillared prodticts shows the acid-base bifunctional catalysis over the isopropanol conversion,and the acidity is relatively stronger.

关 键 词：硅钨杂多阴离子 柱撑水滑石 合成 表征 催化性能 

分 类 号：O643.36[理学—物理化学]