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SAPO-34 facilitates the formation of benzene, toluene and xylenes in direct syngas conversion over MnCrOx-SAPO-34-ZSM-5

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Abstract

Direct conversion of syngas to aromatics over metal oxide and zeolite (OXZEO) composite catalysts is promising. However, the selectivity of more valuable products such as benzene, toluene and xylenes (BTX) is limited due to undesired secondary methylation of BTX. Herein, we report that the introduction of SAPO-34 into MnCrOx-ZSM-5 catalyst enhances significantly the formation of BTX without sacrificing the aromatics selectivity. Under optimized conditions, the fraction of BTX in aromatics reaches 64.7% versus 28.9% over the catalyst without SAPO-34. A number of model reaction tests and characterizations reveal that SAPO-34 consumes partially the intermediates such as ketene, by converting them to light olefins. Thus, the methylation of BTX by ketene to heavy aromatics is inhibited over the external acid sites of ZSM-5, leading to an enhanced BTX selectivity in the products. This hybrid catalyst provides an efficient method for highly selective synthesis of BTX from syngas.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (22321002 and 22008234), the Natural Science Foundation of Liaoning Province (2022011086-JH3/107), Dalian High-level Talent Innovation Program (2021RQ111) and the Innovation Research Fund of Dalian Institute of Chemical Physics (DICP I202240).

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Authors and Affiliations

  1. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China

    Shuchi Zhang, Dengyun Miao, Yi Ding, Mengyuan Li, Xiulian Pan & Xinhe Bao

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Shuchi Zhang, Dengyun Miao, Yi Ding, Mengyuan Li, Xiulian Pan & Xinhe Bao

  3. Shaanxi Yanchang Petroleum (Group) Co., Ltd., & Dalian Institute of Chemical Physics Xi’an Clean Energy (Chemical Industry) Research Institute, Xi’an, 710000, China

    Shujing Guo & Yujuan Zhang

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  1. Shuchi Zhang
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Correspondence to Dengyun Miao or Xiulian Pan.

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Supporting information The supporting information is available online at chem.scichina.com and link.springer.com/journal/11426. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.

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Zhang, S., Miao, D., Ding, Y. et al. SAPO-34 facilitates the formation of benzene, toluene and xylenes in direct syngas conversion over MnCrOx-SAPO-34-ZSM-5. Sci. China Chem. 67, 732–740 (2024). https://doi.org/10.1007/s11426-023-1840-y

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  • DOI: https://doi.org/10.1007/s11426-023-1840-y

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