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Resolving atomic SAPO-34/18 intergrowth architectures for methanol conversion by identifying light atoms and bonds

Author

Listed:
  • Boyuan Shen

    (Tsinghua University)

  • Xiao Chen

    (Tsinghua University)

  • Xiaoyu Fan

    (Tsinghua University)

  • Hao Xiong

    (Tsinghua University)

  • Huiqiu Wang

    (Tsinghua University)

  • Weizhong Qian

    (Tsinghua University)

  • Yao Wang

    (Tsinghua University)

  • Fei Wei

    (Tsinghua University)

Abstract

The micro-structures of catalyst materials basically affect their macro-architectures and catalytic performances. Atomically resolving the micro-structures of zeolite catalysts, which have been widely used in the methanol conversion, will bring us a deeper insight into their structure-property correlations. However, it is still challenging for the atomic imaging of silicoaluminophosphate zeolites by electron microscopy due to the limits of their electron beam sensitivity. Here, we achieve the real-space imaging of the atomic lattices in SAPO-34 and SAPO-18 zeolites, including the Al–O–P atoms and bonds, by the integrated differential phase contrast scanning transmission electron microscopy (iDPC-STEM). The spatial distribution of SAPO-34 and SAPO-18 domains in SAPO-34/18 intergrowths can be clearly resolved. By changing the Si contents and templates in feed, we obtain two SAPO-34/18 catalysts, hierarchical and sandwich catalysts, with highly-mixed and separated SAPO-34 and SAPO-18 lattices respectively. The reduced diffusion distances of inside products greatly improve the catalytic performances of two catalysts in methanol conversion. Based on the observed distributions of lattices and elements in these catalysts, we can have a preliminary understanding on the correlation between the synthesis conditions and structures of SAPO-34/18 intergrowth catalysts to further modify their performances based on unique architectures.

Suggested Citation

  • Boyuan Shen & Xiao Chen & Xiaoyu Fan & Hao Xiong & Huiqiu Wang & Weizhong Qian & Yao Wang & Fei Wei, 2021. "Resolving atomic SAPO-34/18 intergrowth architectures for methanol conversion by identifying light atoms and bonds," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
  • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-22438-z
    DOI: 10.1038/s41467-021-22438-z
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    Cited by:

    1. Jiale Feng & Zhipeng Feng & Liang Xu & Haibing Meng & Xiao Chen & Mengmeng Ma & Lei Wang & Bin Song & Xuan Tang & Sheng Dai & Fei Wei & Tao Cheng & Boyuan Shen, 2024. "Real-space imaging for discovering a rotated node structure in metal-organic framework," Nature Communications, Nature, vol. 15(1), pages 1-8, December.

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