Unusual bulky solvent molecule encapsulation in the organic-amine-occupied 10-membered ring channels of aluminophosphate molecular sieve AlPO4-11

Abstract

Highly crystalline aluminophosphate molecular sieve AlPO4-11 was synthesized using both water and triethylene glycol (TEG) as solvent. The products were thoroughly characterized by powder X-ray diffraction analyses, thermogravimetric analyses (TGA), scanning electron microscope (SEM) analyses, and solid-state CP/MAS NMR analyses. The results showed that both AlPO4-11s had high degree of crystallinity and good thermal stability. The AlPO4-11 synthesized with triethylene glycol had a different morphology from that synthesized with water. Thermogravimetric analysis (TGA) and 13C CP/MAS NMR analyses showed that the bulky organic solvent molecules were encapsulated in the organic-amine-occupied channels of AlPO4-11. This is the first observation that the bulky organic solvent molecules are included in the organic structure-directing agents occupied microporous aluminophosphate molecular sieves. The solvent molecules may act as a co-structure-directing agent in the formation of AlPO4-11 under solvothermal conditions.