多金属氧酸盐
介孔材料
金属有机骨架
材料科学
水溶液
化学工程
结晶学
催化作用
吸附
热液循环
无机化学
化学
物理化学
有机化学
工程类
作者
Romain Canioni,Catherine Roch‐Marchal,Francis Sécheresse,Patricia Horcajada,Christian Serre,Menaschi Hardi-Dan,Gérard Férey,Jean‐Marc Grenèche,Frédéric Lefèbvre,Jong‐San Chang,Young‐Kyu Hwang,Oleg I. Lebedev,Stuart Turner,Gustaaf Van Tendeloo
摘要
Successful encapsulation of polyoxometalate (POM) within the framework of a mesoporous iron trimesate MIL-100(Fe) sample has been achieved by direct hydrothermal synthesis in the absence of fluorine. XRPD, 31P MAS NMR, IR, EELS, TEM and 57Fe Mössbauer spectrometry corroborate the insertion of POM within the cavities of the MOF. The experimental Mo/Fe ratio is 0.95, in agreement with the maximum theoretical amount of POM loaded within the pores of MIL-100(Fe), based on steric hindrance considerations. The POM-MIL-100(Fe) sample exhibits a pore volume of 0.373 cm3 g−1 and a BET surface area close to 1000 m2 g−1, indicating that small gas molecules can easily diffuse inside the cavities despite the presence of heavy phosphomolybdates. These latter contribute to the decrease in the overall surface area, due to the increase in molar weight, by 65%. Moreover, the resulting Keggin containing MIL-100(Fe) solid is stable in aqueous solution with no POM leaching even after more than 2 months. In addition, no exchange of the Keggin anions by tetrabutylammonium perchlorate in organic media has been observed.
科研通智能强力驱动
Strongly Powered by AbleSci AI