SCI和EI收录∣中国化工学会会刊

›› 2010, Vol. 18 ›› Issue (6): 979-987.

• • 上一篇    下一篇

In situ Synthesis of SAPO-34 Zeolites in Kaolin Microspheres for a Fluidized Methanol or Dimethyl Ether to Olefins Process

朱杰, 崔宇, NAWAZ Zeeshan, 王垚, 魏飞   

  1. Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
  • 收稿日期:2010-06-03 修回日期:2010-08-12 出版日期:2010-12-28 发布日期:2010-12-28
  • 通讯作者: WEI Fei, E-mail: weifei@flotu.org
  • 基金资助:
    Supported by the National Natural Science Foundation of China(20736004)

In situ Synthesis of SAPO-34 Zeolites in Kaolin Microspheres for a Fluidized Methanol or Dimethyl Ether to Olefins Process

ZHU Jie, CUI Yu, NAWAZ Zeeshan, WANG Yao, WEI Fei   

  1. Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
  • Received:2010-06-03 Revised:2010-08-12 Online:2010-12-28 Published:2010-12-28
  • Supported by:
    Supported by the National Natural Science Foundation of China(20736004)

摘要: SAPO-34 zeolite is considered to be an effective catalyst for methanol or dimethyl ether conversion to olefins. In this study,we developed the In situ synthesis technology to prepare SAPO-34 zeolite in kaolin microspheres as a catalyst for fluidized methanol or dimethyl ether to olefins process. The silicoaluminophosphate zeolite was first time reported to be synthesized in kaolin microspheres. The SAPO-34 content of synthesized catalyst was about 22% as measured by three different quantitative methods(micropore area,X-ray fluorescence and energy dispersive spectroscopy element analysis). Most of the SAPO-34 zeolites were in nanoscale size and distributed uniformly inside the spheres. The catalytic performance was evaluated in fixed bed and fluidized bed reactors. Compared with the conventional spray-dry catalyst,SAPO/kaolin catalyst showed superior catalytic activities,better olefin selectivities(up to 94%,exclusive coke),and very good hydrothermal stability. The In situ synthesis of SAPO-34 in kaolin microspheres is a facile and economically feasible way to prepare more effective catalyst for fluidized MTO/DTO(methanol to olefins/dimethyl ether to olefins) process.

关键词: SAPO-34, In situ synthesis, kaolin, fluidized bed, methanol to olefins

Abstract: SAPO-34 zeolite is considered to be an effective catalyst for methanol or dimethyl ether conversion to olefins. In this study,we developed the In situ synthesis technology to prepare SAPO-34 zeolite in kaolin microspheres as a catalyst for fluidized methanol or dimethyl ether to olefins process. The silicoaluminophosphate zeolite was first time reported to be synthesized in kaolin microspheres. The SAPO-34 content of synthesized catalyst was about 22% as measured by three different quantitative methods(micropore area,X-ray fluorescence and energy dispersive spectroscopy element analysis). Most of the SAPO-34 zeolites were in nanoscale size and distributed uniformly inside the spheres. The catalytic performance was evaluated in fixed bed and fluidized bed reactors. Compared with the conventional spray-dry catalyst,SAPO/kaolin catalyst showed superior catalytic activities,better olefin selectivities(up to 94%,exclusive coke),and very good hydrothermal stability. The In situ synthesis of SAPO-34 in kaolin microspheres is a facile and economically feasible way to prepare more effective catalyst for fluidized MTO/DTO(methanol to olefins/dimethyl ether to olefins) process.

Key words: SAPO-34, In situ synthesis, kaolin, fluidized bed, methanol to olefins