Seed-assisted, solvent-free synthesis of a CHA-type aluminophosphate molecular sieve

Abstract

Triclinic AlPO₄-34 with CHA topology has been successfully synthesized under seed-assisted, solvent-free conditions. The synthetic conditions of this material were refined. The resultant CHA molecular sieves were characterized by PXRD, SEM, TG-DTA, CHN elements analysis, liquid ¹³C NMR and N₂ physisorption. The results indicate that the CHA molecular sieve has the composition (Al₆P₆O₂₄)(C₄H₉NO)₂, for which morpholine acts as the structure-directing agent. The high surface area and micropore volume for the calcined CHA material imply that it can potentially be used in zeolite-related applications.