Rapid synthesis and characterization of aluminophosphate molecular sieve: EMM-8

摘要

The crystallization of microporous aluminophosphate EMM-8 has been investigated under microwave-hydrothermal (M-H) conditions. The crystallization was performed by employing pseudoboehmite and ortho-phosphoric acid as alumina and phosphorous precursors respectively, using 4-dimethylaminopyridine (4-DMAP) as a structure directing agent (SDA). The crystallized phases were characterized by means of X-ray diffraction, scanning electron microscopy (SEM), and N_2 adsorption measurement at 77 K. EMM-8 was achieved within 4 h at 453 K through the formation of AlPO-5 as an intermediate phase. The presence of AlPO-5 phase is judged from SEM studies wherein the presence of crystallization of hexagonal rods, characteristic of AlPO-5 phase is noticed.