Volume 8 Issue 2
Apr.  2023
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Article Navigation >  Green Energy&Environment  > 2023  >  8(2): 530-537
Yi Fu, Youming Ni, Wenhao Cui, Xudong Fang, Zhiyang Chen, Zhaopeng Liu, Wenliang Zhu, Zhongmin Liu. Insights into the size effect of ZnCr2O4 spinel oxide in composite catalysts for conversion of syngas to aromatics. Green Energy&Environment, 2023, 8(2): 530-537. doi: 10.1016/j.gee.2021.07.003
Citation: Yi Fu, Youming Ni, Wenhao Cui, Xudong Fang, Zhiyang Chen, Zhaopeng Liu, Wenliang Zhu, Zhongmin Liu. Insights into the size effect of ZnCr2O4 spinel oxide in composite catalysts for conversion of syngas to aromatics. Green Energy&Environment, 2023, 8(2): 530-537. doi: 10.1016/j.gee.2021.07.003
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Insights into the size effect of ZnCr2O4 spinel oxide in composite catalysts for conversion of syngas to aromatics

doi: 10.1016/j.gee.2021.07.003

  • a. National Engineering Laboratory for Methanol to Olefins, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, Liaoning, China;

  • b. University of Chinese Academy of Sciences, Beijing, 100049, China

Funds:

We acknowledge the financial support from the National Natural Science Foundation of China (Grant No. 21978285, 21991093, 21991090), and the “Transformational Technologies for Clean Energy and Demonstration”, Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA21030100). We acknowledge Mr. Yijun Zheng and Mrs. Yanli He for their assistance in the structural characterization of catalysts.

  • Received date 06 April 2021, Accepted date 12 July 2021, RevRecd date 09 June 2021, Publish date 14 July 2021,
    Abstract
  • Direct conversion of syngas to aromatics (STA) over oxide-zeolite composite catalysts is promising as an alternative method for aromatics production. However, the structural effect of the oxide component in composite catalysts is still ambiguous. Herein, we investigate the size effect by selecting ZnCr2O4 spinel, as a probe oxide, mixing with H-ZSM-5 zeolite as a composite catalyst for STA reaction. The CO conversion, aromatics selectivity and space-time yield (STY) of aromatics are all significantly improved with the crystal size of ZnCr2O4 oxide decreases, which can mainly attribute to the higher oxygen vacancy concentration and thus the rapid generation of more C1 oxygenated intermediate species. Based on the understanding of the size–performance relationship, ZnCr2O4-400 with a smaller size mixing with H-ZSM-5 can achieve 32.6% CO conversion with 76% aromatics selectivity. The STY of aromatics reaches as high as 4.79 mmol gcat-1 h-1, which outperforms the previously reported some typical catalysts. This study elucidates the importance of regulating the size of oxide to design more efficient oxide-zeolite composite catalysts for conversion of syngas to value-added chemicals.

     

    • • ZnCr2O4 was selected as a probe oxide to elucidate the size-performance relationship for syngas to aromatics reaction. • ZnCr2O4 oxide with a smaller size is conducive to promote the catalytic performance. • ZnCr2O4-400 with a smaller size mixing with H-ZSM-5 can achieve 32.6% CO conversion with 76% aromatics selectivity. • The intrinsic reason for size effect is related to oxygen vacancy and the formation of C1 intermediates. • The STY of aromatics (4.79 mmol gcat−1 h−1) exceeds the previously reported some typical catalysts.
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