Chinese Journal of Catalysis ›› 2016, Vol. 37 ›› Issue (9): 1496-1501.DOI: 10.1016/S1872-2067(15)61110-X

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Methanol-to-olefin induction reaction over SAPO-34

You Zhoua,b, Liang Qia,b, Yingxu Weia, Cuiyu Yuana, Mozhi Zhanga,b, Zhongmin Liua   

  1. a. Dalian National Laboratory for Clean Energy, National Engineering Laboratory for Methanol to Olefins, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
    b. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2016-03-26 Revised:2016-04-18 Online:2016-09-21 Published:2016-09-21
  • Contact: Zhongmin Liu

Abstract:

The methanol-to-olefin induction reaction over the SAPO-34 was performed using a fluidized-bed system. We found that the whole induction period could be divided into three reaction stages. Further investigation of the reaction kinetics revealed that this induction reaction behavior was different from that over H-ZSM-5 catalyst. Compared with the H-ZSM-5, the generation of initial active centers is easier over SAPO-34 because of its limited diffusivity and the spatial confinement effect of the cages. However, the autocatalysis reaction stage is difficult over SAPO-34 because of the continuous formation of inactive methyladamantanes.

Key words: Methanol-to-olefin, Activation energy, SAPO-34, Hydrocarbon pool, Induction period