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  • 刘新 ( 副教授 )

    的个人主页 http://faculty.dlut.edu.cn/xliu/en/index.htm

  •   副教授   博士生导师   硕士生导师
论文成果 当前位置: 中文主页 >> 科学研究 >> 论文成果
Solid-State and Organic Template-Free Synthesis of Zeolite Omega by Conversion of Magadiite in the Presence of Seed Crystals and Investigation of Conversion Mechanism

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论文类型:期刊论文
发表时间:2021-01-10
发表刊物:INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
卷号:59
期号:44
页面范围:19574-19583
ISSN号:0888-5885
摘要:In this work, we developed a sustainable synthesis of zeolite omega via the conversion of magadiite under solid-state and organic template-free conditions. The conversion behavior and mechanism were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, Raman spectroscopy, and Al-27 magic-angle spinning nuclear magnetic resonance (MAS NMR) in detail. It can be found that most of the 5Rs and part of 6Rs in magadiite were maintained as medium-range structures to participate in the formation of zeolite omega; additive seed crystals underwent destruction due to collapse of the four-membered rings and five-membered rings in the MAZ framework, while the remaining six-membered rings from seed crystals acted as the secondary crystal nucleus to provide direction function; Al species preferred to enter T2 positions, which are located in the six-membered rings in zeolite omega. In addition, the influences of synthesis parameters were discussed in detail.

 

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