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用(NH_4)_2SiF_6二次合成法制备了Si/Al=4.2～7.1、结晶度大于94％的系列八面沸石(FSY样品),再于500℃水热处理得到相应的US-SY样品。XRD、DTA及IR研究发现US-SY样品较FSY样品有更高的热稳定性、骨架稳定性和酸强度,其裂解、歧化活性也优于FSY样品。
A series of faujasite zeolites (FSY samples) with Si / Al = 4.2 ~ 7.1 and crystallinity greater than 94% were prepared by (NH_4) _2SiF_6 secondary synthesis. The corresponding US-SY samples were obtained by hydrothermal treatment at 500 ℃. The results of XRD, DTA and IR show that the US-SY sample has higher thermal stability, backbone stability and acid strength than the FSY sample, and its cleavage and disproportionation activity is also superior to that of the FSY sample.