层柱水滑石(Ⅰ)ZnAl-La(TiW_(11))_2的合成、表征及其催化性能  

Synthesis, Characterization and Catalytic Properties of a Pillared-Layered Double Hydroxide ZnAl-La(TiW_(11))_2

作　　者：蒋维[1] 刘杰凤[1] 周统武[1] 曾和平[2] 

机构地区：[1]茂名学院应用化学系,茂名525000 [2]华南师范大学化学系

出　　处：《应用化学》2006年第1期99-105,共7页Chinese Journal of Applied Chemistry

摘　　要：以十四酸根阴离子柱撑Zn-Al水滑石为预撑前体,在水溶液中用离子交换法将稀土杂多配阴离子 La(TiW11)2成功地插层组装到水滑石层板间,获得了一种新型的超分子插层材料Zn0．76Al0．24(OH)2·0．018 [La(Ti0．97W11．5O39)2]·0．012C13H27COO·0．71H2O。用元素分析、IR、XRD和TG-DTA测试技术对产物的组成与结构进行了表征。结果表明,该产物中[La(TiW11O39)2]13-配阴离子沿其长轴垂直于层板的方向分布于水滑石层板间,产物有规整的层状结构、大的层间距(d 003=3．29 nm)、良好的结晶度和热稳定性,产物对二甘醇与苯甲酸的酯化反应、二甘醇的脱水环化反应和苯甲醛的氧化反应具有良好的催化性能。Heteropoly complex ion with lanthanum—La （TiW11）2 was successfully intercalated into the interlayer space of Zn-Al, with Zn0.78Al0.22（OH2）·0.22C13H27COO·0.81H2O as precursor in an aqueous solution via ion exchange reaction, and a new type of pillared layered microporous compound, Zn0.76Al0.24（OH）2·0.018[La（Ti0.97W11.5O39）2]·0.012C13H27C9OO·0.81H2O with higher basal space （ d003 = 3.29 nm） was obtained. The composition, structure and properties of the new pillared material were characterized by elemental analysis, XRD, IR spectra and TG-DTA curves. The results show that myristic acid radical anion of precursor Zn0.78 Al0.22（OH）2·0.22c13h27COO·0.81H2O can be almost completely replaced by complex anion [ La（ TiW11 O39） 2 ]^3- under special controlled reaction conditions. The new pillared hydrotalcite has a good crystallinity, a regular layered structure and a good thermal stability. The orientation of the intercalated anion [ La（ TiW11 O39）2 ] ^13- was deduced. It has also been found that the new material has a good catalytic activity and selectivity for the esterification of benzoic acid with diethylene glycol, the dehydrationcyclization of diethylene glycol, and the oxidation of benzaldehyde.

关 键 词：稀土杂多配离子 柱撑水滑石 合成 表征 催化性能 

分 类 号：O643[理学—物理化学] O611.4[理学—化学]