Synthesis of the composite material Y/ASA and its catalytic performance for the cracking of n-decane

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• 作者：Qinglei Meng^a ; Baijun Liu^a ; ^{bjliu@cup.edu.cn} ; Jiarui Piao^b ; Qiwu Liu^b
• 关键词：Y/ASA composite ; Wrapping ; Brø ; nsted acid site ; Mesopore ; n-Decane ; Catalytic cracking
• 刊名：Journal of Catalysis
• 出版年：2012
• 期刊代码：97_00219517
• 类别：ce
• 出版时间：June, 2012
• 卷：290
• 期：Complete
• 页码：55-64
• 文件大小：1030 K

摘要

Y/ASA composite was successfully prepared by wrapping NaY zeolite with small-crystal size in amorphous silica-alumina (ASA) gel. Characterization results show that bonding action between zeolite Y and ASA contributes new acid sites in HY/ASA, which are responsible for its higher activity in the catalytic cracking of n-decane and light diesel, comparing with the mixture-derived catalysts. HY/ASA catalyst possesses larger surface area and mesoporous volume and uniform slit-shaped mesopores, which are beneficial to the diffusion of the products and responsible for higher yield of the middle distillates. The smaller zeolite Y crystallites in Y/ASA lead to more contact points between Y crystallites and ASA and thus provide more new acid sites for the HY/ASA catalyst. The high conversion of n-decane and yield of middle distillates over the HY/ASA catalyst can be ascribed to its acid quantity and super pore structure.