Synthesis of SAPO-34 using metakaolin in the presence of β-cyclodextrin

被引：10
作者：
Zhang, Chen [1 ,2 ]
Lu, Xuchen [1 ,3 ]
Wang, Tizhuang [1 ]
机构：
[1] Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100039, Peoples R China
[3] United Res Ctr Resource & Mat, Wuhai 016000, Inner Mongolia, Peoples R China
来源：
JOURNAL OF ENERGY CHEMISTRY | 2015年 / 24卷 / 04期
基金：
中国国家自然科学基金;
关键词：
SAPO-34; Metakaolin; beta-cyclodextrin; Acidity; MTO process; MOLECULAR-SIEVES; HYDROTHERMAL SYNTHESIS; LIGHT OLEFINS; MTO REACTION; CONVERSION; METHANOL; CATALYSTS; LIFETIME; COMBINATION; TEMPLATES;
D O I：
10.1016/j.jechem.2015.06.008
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
SAPO-34 molecular sieves were synthesized by the addition of beta-cyclodextrin (beta-CD) as crystal growth inhibitor using metakaolin as silicon and aluminum sources. Properties of the obtained samples were characterized by XRD, SEM, N-2 adsorption-desorption, FTIR, XRF, EDX, NH3-TPD and Si-29 MAS NMR. When beta-CD was added, crystal size of the SAPO-34 crystals decreased. Variation of Si content from the crystal center to surface decreased while total Si content hardly changed. Si-29 MAS NMR results showed that beta-CD contributed to better Si dispersion and decreased the size of Si(4Si) patches. Moreover, the MTO (methanol-to-olefin) process was conducted to investigate the influence of beta-CD on catalytic performance. The synthesized sample with molar ratio of beta-CD/Al2O3 equaling 0.055 remained active for 610 min while the sample synthesized without beta-CD for only 280 min, which indicates that the lifetime of catalyst synthesized with beta-CD is greatly prolonged. (C) 2015 Science Press and Dalian Institute of Chemical Physics. All rights reserved.
引用
收藏
页码：401 / 406
页数：6
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