Utilization of SAPO-18 or SAPO-35 in the bifunctional catalyst for the direct conversion of syngas to light olefins.

Journal: RSC advances
Published Date: Apr 13, 2021

Abstract

SAPO-18 and SAPO-35 were synthesized and utilized as the zeotype in the bifunctional catalyst for the STO process, respectively. SEM and Ar physisorption proved that SAPO-18 displayed abundant outer cages, and facilitated the diffusion of the reactant and products. NH-TPD revealed the adequate acid strength of SAPO-18, thus ZnCrO + SAPO-18 bifunctional catalyst showed high selectivity to light olefins during the whole stage of the STO process. 19.9% CO conversion and 68.6% light olefins selectivity (free of CO) was achieved over ZnCrO + SAPO-18(0.048) at 653 K, 1.0 MPa, GHSV = 6000 mL g h. The catalytic performance was stable after 6000 minutes of reaction because of the good diffusibility of SAPO-18. GC-MS and TG demonstrated that the ZnCrO + SAPO-35 bifunctional catalyst deactivated very quickly because of the severe formation of the heavy coke deposits, which should be attributed to the acidic properties of SAPO-35 and the poor diffusibility originating from its 2-dimensional channel system. Although the ZnCrO + SAPO-35 bifunctional catalyst exhibited high CO conversion and light olefins selectivity at the early stage of the STO process as well, its catalytic performance was unsustainable.

Authors

  • Yuxuan Huang
    Engineering Research Center of Large Scale Reactor Engineering and Technology, Ministry of Education, State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology Shanghai 200237 China wying@ecust.edu.cn +86 21 64252192 +86 21 64252151.
  • Hongfang Ma
    Engineering Research Center of Large Scale Reactor Engineering and Technology, Ministry of Education, State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology Shanghai 200237 China wying@ecust.edu.cn +86 21 64252192 +86 21 64252151.
  • Zhiqiang Xu
    Engineering Research Center of Large Scale Reactor Engineering and Technology, Ministry of Education, State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology Shanghai 200237 China wying@ecust.edu.cn +86 21 64252192 +86 21 64252151.
  • Weixin Qian
    Engineering Research Center of Large Scale Reactor Engineering and Technology, Ministry of Education, State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology Shanghai 200237 China wying@ecust.edu.cn +86 21 64252192 +86 21 64252151.
  • Haitao Zhang
    Graduate School, Hebei North University, 075000 Zhangjiakou, Hebei, China.
  • Weiyong Ying
    Engineering Research Center of Large Scale Reactor Engineering and Technology, Ministry of Education, State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology Shanghai 200237 China wying@ecust.edu.cn +86 21 64252192 +86 21 64252151.

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