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

能源化学(英文) ›› 2015, Vol. 21 ›› Issue (4): 401-406.

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

Chen Zhang^a,b, Xuchen Lu^a,c, Tizhuang Wang^a

a State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences (CAS), Beijing 100190, China;
b University of Chinese Academy of Sciences, Beijing 100039, China;
c United Research Center for Resource and Materials, Wuhai 016000, Inner Mongolia, China

收稿日期:2015-04-27 修回日期:2015-06-30 发布日期:2015-08-21
通讯作者: Xuchen Lu
基金资助:
This work was supported by the National Natural Science Foundation of China (21406247).

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

Chen Zhang^a,b, Xuchen Lu^a,c, Tizhuang Wang^a

a State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences (CAS), Beijing 100190, China;
b University of Chinese Academy of Sciences, Beijing 100039, China;
c United Research Center for Resource and Materials, Wuhai 016000, Inner Mongolia, China

Received:2015-04-27 Revised:2015-06-30 Published:2015-08-21
Contact: Xuchen Lu
Supported by:
This work was supported by the National Natural Science Foundation of China (21406247).

摘要/Abstract

摘要： SAPO-34 molecular sieves were synthesized by the addition of β-cyclodextrin (β-CD) as crystal growth inhibitor using metakaolin as silicon and aluminum sources. Properties of the obtained samples were characterized by XRD, SEM, N₂ adsorption-desorption, FTIR, XRF, EDX, NH₃-TPD and ²⁹Si MAS NMR. When β-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. ²⁹Si MAS NMR results showed that β-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 β-CD on catalytic performance. The synthesized sample with molar ratio of β-CD/Al₂O₃ equaling 0.055 remained active for 610 min while the sample synthesized without β-CD for only 280 min, which indicates that the lifetime of catalyst synthesized with β-CD is greatly prolonged.

关键词: SAPO-34, Metakaolin, β-cyclodextrin, Acidity, MTO process

Abstract: SAPO-34 molecular sieves were synthesized by the addition of β-cyclodextrin (β-CD) as crystal growth inhibitor using metakaolin as silicon and aluminum sources. Properties of the obtained samples were characterized by XRD, SEM, N₂ adsorption-desorption, FTIR, XRF, EDX, NH₃-TPD and ²⁹Si MAS NMR. When β-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. ²⁹Si MAS NMR results showed that β-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 β-CD on catalytic performance. The synthesized sample with molar ratio of β-CD/Al₂O₃ equaling 0.055 remained active for 610 min while the sample synthesized without β-CD for only 280 min, which indicates that the lifetime of catalyst synthesized with β-CD is greatly prolonged.

Key words: SAPO-34, Metakaolin, β-cyclodextrin, Acidity, MTO process

Chen Zhang, Xuchen Lu, Tizhuang Wang. Synthesis of SAPO-34 using metakaolin in the presence of β-cyclodextrin[J]. 能源化学(英文), 2015, 21(4): 401-406.

Chen Zhang, Xuchen Lu, Tizhuang Wang. Synthesis of SAPO-34 using metakaolin in the presence of β-cyclodextrin[J]. Journal of Energy Chemistry, 2015, 21(4): 401-406.

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

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

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