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.
出处
《高等学校化学学报》
CSCD
北大核心
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
关键词
硅钨杂多阴离子
柱撑水滑石
合成
表征
催化性能
Tungstosilicate heteropolyanions
Pillared LDHs
Synthesis and characterization
Acid-base property.
