Fabrication of Hierarchically Porous FAU/α-Al2O3 Monoliths via Gel Pre-aging Routes Using Seed Gel as Directing Agent

作者：Wang Jia,Jin Qibing,Zhao Tianbo

摘要：Hierarchically porous FAU monoliths were synthesized via the gel pre-aging route using seed gel as directing agent andα-Al2O3 as monolithic carrier.The as-synthesized samples were characterized by means of the Fourier transform infrared spectroscopy(FT-IR),X-ray powder diffraction(XRD),scanning electron microscopy(SEM),and N2 adsorption techniques.The effects of seed gel,gel pre-treatment,and gel pre-aging step were determined,while the possible mechanism for formation of alumina composites via different synthesis processes were discussed.The results showed that the crystal size,the shape,and the loading of the supported FAU could be readily tuned by varying the composition of the crystallization gel without notably changing the structure ofα-Al2O3.The proposed seed gel pre-treating and gel pre-aging route are simple,reproducible,and practically easy to integrate triple porous structures into large-dimension monoliths,which are proved to be very effective in depositing pure FAU crystals on theα-Al2O3 skeleton surface and strengthening the interfacial interaction between them.Moreover,it may provide inspiration to the synthesis of other hierarchical zeolites.

发文机构：College of Information Science and Technology Key Laboratory of Cluster Science of Ministry of Education

关键词：FAU/α-Al2O3monolithshierarchicalporosityseedgelPRE-AGINGgelpre-treatment

分类号： O64[理学—物理化学]