Structural aspects of AlPO4-5 zeotypes synthesized by microwave hydrothermal process. 1. Effect of heating time and microwave power

摘要

AlPO4-5 with AFI structure containing 12-membered rings was prepared using the aluminum isopropoxide precursor as a source of alumina and TEA as the structure directing agent via microwave technique. The influence of microwave power and heating time on the dimensions of AlPO4-5 crystals formed in the system Al2O3:P2O5:(C2H5)3N (or (C3H7)3N):H2O:HF has been studied systematically. It was found that the morphology of the AlPO4-5 depended on the microwave power andudheating time. Several mechanisms of fast crystallization existed in the microwave radiation, due to increased dissolution of the gel by lonely water molecules in almost temperature gradient-free and convection-free in situ heating.