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

• 作者: Wang Jia Jin Qibing Zhao Tianbo
• 来源期刊: 中国炼油与石油化工（英文版）
• 年，卷（期）: 2020,（4）
• 所属期刊栏目: Catalyst Research
• 页码范围: 46-55
• 页数: 10页
• 语种: 英文

摘要

Hierarchically porous FAU monoliths were synthesized via the gel pre-aging route using seed gel as directing agent and α-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 of α-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 the α-Al2O3 skeleton surface and strengthening the interfacial interaction between them.Moreover,it may provide inspiration to the synthesis of other hierarchical zeolites.