摘要
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。
Faujasiste zeolites(FSY) with different Si/Al ratios(4. 2-7.1) are prepared by secondary synthesis with (NH4)2SiF6. The corresponding US-SYC4. 2-7.1) samples are also prepared by the stabilization treatment of FSY samples at 500℃ hydrothermal condition. The XRD, DTA and IR studies show that the thermal stability and framework stability and acid strength of US-SY samples are higher than that of FSY samples. The catlalytic activity of USSY samples for the cumene cracking, toluene disproportionation and dealkylation actirity are superior to that of FSY samples.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1992年第5期571-575,共5页
Chemical Journal of Chinese Universities
关键词
富硅Y沸石
超稳八面沸石
催化活性
Faujasite enriched in silicon,Ultrastable faujasite zeolites, Thermal stability, Hy-droxyl acidity, Catalytic activity
