关键词: UZM-8, 二乙基二甲基氢氧化铵, 层状沸石, 合成, 表征

Novel layered UZM-8 zeolite was hydrothermally synthesized using diethyldimethyl-ammonium hydroxide (DEDMAOH) as structure-directing agent, and the effects of Si/Al ratio and DEDMAOH dosage on the structures of resultant UZM-8 were also discussed. The UZM-8 zeolite was systematically characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TG, DTG) and infrared (IR) spectrum methods to clarify its framework topology, layer arrangement, and morphology. Its framework topology was similar to that of MWW type MCM-56, but their distinct inter-layer distances and stack patterns were different. UZM-8 could not be fabricated when the DEDMAOH/SiO2 molar ratio was less than 0.3. With the increase of SiO2/Al2O3 molar ratio, the characteristic diffraction peaks indexed as 6.6° and 7.1° contracted into one diffraction peak, which indicated that the interlayer distances were reduced along the c axis.

Key words: UZM-8, DEDMAOH, layered zeolite, synthesis, characterization