Studies of Ultrastable Faujasites Enriched in Silicon--Preparation, Characterization, Stability, Hydroxyl Acidity andcatalytic Activity

Abstract

Abstract: Faujasiste zeolites(FSY) with different Si/Al ratios(4.2～7.1) are prepared by secondary synthesis with (NH₄)₂SiF₆.The corresponding US-SYC 4.2～7.1) 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-SYsamples are higher than that of FSYsamples.The catlalytic activity of USSY samples for the cumene cracking, toluene disproportionation and dealkylation actirity are superior to that of FSY samples.

Key words: Faujasite enriched in silicon, Ultrastable faujasite zeolites, Thermal stability, Hy-droxyl acidity, Catalytic activity

TrendMD:

WANG Qiu-ying, SHENG Fen-ling, Jian Pan-ming, ZHU Chao, XU Yan-he, YAN Zi-feng, CHE Biao . Studies of Ultrastable Faujasites Enriched in Silicon--Preparation, Characterization, Stability, Hydroxyl Acidity andcatalytic Activity[J]. Chem. J. Chinese Universities, 1992, 13(5): 571.

References

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