Microwave synthesis of AFI-type aluminophosphate molecular sieve under solvent-free conditions

• AlPO4-5 was synthesized by microwave irradiation under solvent-free conditions.
• AFI molecular sieves have hierarchical micro- and meso-porous structure.
• Pretreated activated carbon was used as the reaction medium for AFI synthesis.

AlPO4-5 aluminophosphate molecular sieve with AFI topology has been successfully synthesized by microwave irradiation under solvent-free conditions. The key influential factors controlling the crystallization of AFI structure were thoroughly investigated. The optimum synthetic conditions of this material are as follows: the initial composition is 1.0Al2O3: 3.0P2O5: 2.0HF: 8.0TEABr(tetraethylammonium bromide): 125C, aluminum isopropoxide is the best aluminum source, and activated carbon needs to be pretreated before used as the reaction medium and hard template. The resultant AlPO4-5 molecular sieves were characterized by X-ray diffraction (XRD), N2 physisorption, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results reveal that the obtained samples exhibit hierarchically porous characteristic.

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