沸石
异丙苯
催化作用
化学工程
结晶度
材料科学
再结晶(地质)
催化裂化
焦炭
ZSM-5型
开裂
纳米颗粒
冶金
化学
纳米技术
有机化学
复合材料
古生物学
工程类
生物
作者
Toru Wakihara,Akio Ihara,Shigenori Inagaki,Junichi Tatami,Kaku Sato,Katsutoshi Komeya,Takeshi Meguro,Yoshihiro Kubota,Atsushi Nakahira
摘要
Zeolites with high external surface area allow diffusing reactants greater access to catalytically active sites, which has led to interest in the preparation of nanosized zeolites. In this study, a top-down approach has been used for zeolite synthesis by first milling the zeolite to produce nanoparticles. This technique destroys the outer portion of the zeolite framework, causing a significant decrease in its catalytic activity. To remedy this, the damaged part was recrystallized using a dilute silicate solution after bead milling. The combined bead milling and postmilling recrystallization yielded nano ZSM-5 (MFI type zeolite), approximately 60 nm in size, with high crystallinity, and the zeolite powder showed a higher catalytic activity in cumene cracking in comparison with the raw ZSM-5 zeolite. Furthermore, the decrease in crystal size suppresses catalyst deactivation through coke deposition during cumene cracking.
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