Creation of Highly Dispersed Supported Polyoxometalate Cesium Salts via Cation Exchange from Alkylammonium Salts on Supports
Creation of Highly Dispersed Supported Polyoxometalate Cesium Salts via Cation Exchange from Alkylammonium Salts on Supports
复制标题
通过载体上的烷基铵盐进行阳离子交换制备高度分散的负载型多金属氧酸铯盐
DOI：
10.1002/cnma.202200428
复制
发表时间：
2022
期刊：
影响因子：
3.8
通讯作者：
Yamaguchi Kazuya
中科院分区：
文献类型：
--
作者：
Suzuki Takaaki;Yabe Tomohiro;Wachi Keiju;Yonesato Kentaro;Suzuki Kosuke;Yamaguchi Kazuya
报道了有机溶剂中缺位多金属氧酸盐(POM)四正丁基铵(TBA)盐上金属氧簇的精确设计。然而，由于POM TBA盐的热稳定性低和/或有效比表面积低，在高温下不适用于多相催化剂的气相反应。为了避免这一问题，我们开发了一种新的制备方法，即通过与载体上相应的−盐进行阳离子交换，获得高度分散的负载型PMCs盐(Cs-TBA-POM/Support)。在本研究中，一种名为TBA4PVMo11O40(tba−PVMo11)的Keggin模型聚甲醛被负载在氧化物(tba−PVMo11/载体)上，方法是在乙腈中采用初始湿法。将该载体与三氟甲磺酸铯在乙醇中进行阳离子交换，得到负载型−Cs盐(Cs−PVMo11/载体)。各种表征结果表明，−-PVMo11/载体在阳离子交换过程中保持了原有的凯金结构，Cs-−-PVMo11高度分散在载体上。Cs-−-PVMo11/Support在573 K的有氧条件下焙烧后仍保持了Keggin结构。
We have reported several precisely designed metal‐oxo clusters on lacunary polyoxometalate (POM) tetra‐n‐butylammonium (TBA) salts in organic solvents. However, owing to their low thermostability and/or low effective surface area, POM TBA salts are not amenable to heterogeneous catalysts for gas‐phase reactions at high temperature. To avoid this problem, we developed a new preparation method that obtains highly dispersed supported‐POM Cs salts (Cs−POM/support) via cation exchange from the corresponding TBA salts on supports. In this study, a model Keggin‐type POM called TBA4PVMo11O40(TBA−PVMo11) is supported on oxides (TBA−PVMo11/support) using an incipient wetness method in acetonitrile. This TBA−PVMo11/support was cation‐exchanged with cesium trifluoromethanesulfonate in ethanol to obtain supported‐POM Cs salts (Cs−PVMo11/support). Various characterizations revealed that the TBA−PVMo11/support maintained the original Keggin structure during cation exchange and that Cs−PVMo11 was highly dispersed on the supports. Furthermore, Cs−PVMo11/support maintained the Keggin structure even after calcination at 573 K under an aerobic condition.