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Methanol to Aromatic Reaction over HZSM-5: Co-Effect Desilication and SiO2 Deposition

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Abstract

In this work Si/HZSM-5-0.09M catalyst was prepared using desilication and regrowth of SiO2 method, which was characterized by XRF, XRD, SEM, NH3-TPD, and N2 adsorption/desorption. Meanwhile, the structure–activity relationship was comprehensively discussed. The results revealed that the aromatics total selectivity of Si/HZSM-5-0.09M catalyst was significantly improved, from 33 to 54.8% compared to HZSM-5 under the optimal conditions. Also, the selectivity of p-xylene over Si/HZSM-5-0.09M catalyst increased from 4.6 to 19.8% compared to HZSM-5. The total selectivity of benzene, toluene, and xylene over Si/HZSM-5-0.09M catalyst was significantly improved by 66.1% compared to that of HZSM-5. Thus, an excellent catalytic effect has been found, which indicates that the SiO2 deposition on the surface favors the enhancement of the p-xylene selectivity in the methanol aromatization reaction.

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Funding

We acknowledge financial support from the National Natural Science Foundation of China (no. 21666019) and the science and technology support project of Gansu province (1604GKCD026).

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Authors and Affiliations

  1. College of Petrochemical Technology, Lanzhou University of Technology, 730050, Lanzhou, China

    Hui Li, Peng Dong, Dong Ji, Xinhong Zhao, Chunqiang Li & Guixian Li

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  1. Hui Li
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  2. Peng Dong
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  3. Dong Ji
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  4. Xinhong Zhao
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  5. Chunqiang Li
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  6. Guixian Li
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Correspondence to Guixian Li.

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Abbreviarions: BTX, benzene-toluent-xylene; MTG, methanol to gasoline; MTO, methanol to olefins; MTP, methanol to propylene; MTA, methanol to aromatic; MTH, methanol to hydrocarbon; TEOS, tetraethoxysilane; XRD, X-ray diffraction; SEM, scanning electron microscopy; XRF, X-ray fluorescence analysis; NH3-TPD, temperature-programmed desorption of NH3; L, Lewis acid sites; B, Brönsted acid sites.

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Hui Li, Dong, P., Ji, D. et al. Methanol to Aromatic Reaction over HZSM-5: Co-Effect Desilication and SiO2 Deposition. Kinet Catal 62, 418–427 (2021). https://doi.org/10.1134/S0023158421030058

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  • DOI: https://doi.org/10.1134/S0023158421030058

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