Abstract
Three aluminophosphate molecular sieve AlPO4-5s were synthesized using water, ethylene glycol, and triethylene glycol as solvent. The products were thoroughly characterized by powder X-ray diffraction analyses, thermogravimetric analyses, scanning electron microscope analyses, and solid-state cross polarization magic angle spinning nuclear magnetic resonance analyses. The results showed that solvothermally synthesized aluminophosphate molecular sieve AlPO4-5 from triethylene glycol was much less stable than that hydrothermally synthesized from water. Thermogravimetric analysis and 13C cross polarization magic angle spinning nuclear magnetic resonance analyses confirmed that the bulky solvent molecules of triethylene glycol were encapsulated within the channels of AlPO4-5 and was responsible for the significant decrease of the thermal stability of open-framework.
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