过氧杂多阴离子柱撑水滑石的合成、表征及催化性能的研究

Studies on Synthesis, Characterization and Catalytic Behavior of Hydrotalcite Pillared with Peroxoheteropolyanions

通过离子交换法,将含钛过渡金属离子一、三取代钨硅、钨磷过氧杂多配合物嵌入Zn_2Al类水滑石中,获得了柱撑化合物,并用XRD,IR,XPS,元素分析等手段对产物的结构和组成进行了表征.结果表明,过氧杂多阴离子进入水滑石层间后,水滑石的层间距从0.92nm增大到1.47nm,且O_2^(2-)链没有被破坏.柱撑产物在环己烯氧化反应中显示优良的催化性能.

The Keggin - ion [ SiW11 (TiO2) O39 ]6-, [ SiW9 ( TiO2)3O37]10-, [ PW11(TiO2)-O39]5-. [PW9(TiO2)3O37]9- intercalated Zn2Al hydrotalcite - like compounds were prepared by means of direct ion-exchange reaction in aqueous solution, and were characterized by elemental analysis , XRD , IR and XPS spectra . The interlayer space of the pillared products increased from 0.92nm to 1. 47nm with the peroxoheteropolyanions displacing the NO3- ions in the gallery. Results from IR and XPS show that the peroxoheteropolyanions structure are well remained. The pillared products showed good catalytic behavior over the cyclohexene conversion.