Highly efficient synthesis of LTA-type aluminophosphate molecular sieve by improved ionothermal method†
Abstract
An LTA-type aluminophosphate molecular sieve has been successfully synthesized by an improved ionothermal method from a gel containing low-dosage ionic liquids. The optimum synthetic conditions of this material are refined. The resultant LTA molecular sieves were characterized by XRD, SEM, TG-DTA, CHN elemental analysis, solution 13C NMR, EDX, TEM and N2 physisorption. The composition of the resulting LTA-type molecular sieves is determined to be (Al12P12O48)(C4H9NO)2(C8H15N2+)2(F−)2, for which morpholine together with 1-butyl-3-methylimidazolium cations act as the structure-directing agent. The high zeolite yield, as well as the high specific surface area and micropore volume for the calcined LTA-type materials, imply that these zeolitic materials have a high potential in applications.