杂多酸型层柱状阴离子粘土的合成表征与酸碱催化行为

SYNTHESIS,CHARACTERIZATION AND ACID-BASE PROPERTIES OF POLYOXOMETALATE PILLARED ANIONIC CLAYS

合成了1：12系列Keggin结构磷钨钒杂多阴离子柱撑阴离子粘土，用元素分析，XRD和IR对产物的组成和结构进行了表征，考察了合成产物在异丙醇反应中的酸碱催化行为。研究表明，柱撑材料表面同时存在酸碱两类催化活性中心，但其催化性能明显优于粘土前驱体和相应杂多酸盐，且在考察的温度范围内，其酸性随温度的升高而增加。

Tungstovanadophosphate anions pillared anionic clays were syhthesized, and were characterized by XRD, IR and elemental analysis. The acid-base catalytic properties of the pillared products were examined over isopropanol conversions. Results show that the pillared products are more cataytically active than that of the clays and the corresponding sats of polyanions, and there exists two kinds of active sites (acid and base sites) on the surface of the pillared products. There is an obvious increasement in the isopropanol conversion and the propene selectivity with the increased calcined temperatures of the samples.