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Physicochemical and Catalytic Properties of the Mo–Zr/ZSM-5 Catalysts of Methane Dehydroaromatization

  • CHEMICAL KINETICS AND CATALYSIS
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Abstract

The effect of the method for the introduction of zirconium in the 4Mo/ZSM-5 catalyst and of its amount on the physicochemical and catalytic properties of the catalyst during the nonoxidative conversion of methane into aromatic hydrocarbons (benzene and naphthalene) has been studied. The catalyst was modified with zirconium by impregnation and solid phase mixing. The resulting zeolite catalysts were studied by IR spectroscopy, X-ray diffraction analysis, low-temperature nitrogen adsorption, temperature-programmed ammonia desorption, scanning and transmission electron microscopy, and simultaneous thermal analysis. With an increase in the zirconium concentration introduced in the 4Mo/ZSM-5 catalyst, the strength and concentration of its strong acid sites that are responsible for methane aromatization decrease regardless of the method of modification. The particle size and morphology of the catalyst, the distribution of Mo and Zr in them, and the presence of coke deposits on their surface were determined by scanning and transmission electron microscopy. The catalytic tests and subsequent thermal analysis of the samples showed that the addition of zirconium to the 4Mo/ZSM-5 catalyst leads not only to an increase in its catalytic activity, but also to operational stability due to the lower rate of coke formation. It was established that 4Mo/ZSM-5 modified with 1 wt % Zr by solid-phase synthesis is the most effective catalyst in methane dehydroaromatization (DHA).

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Funding

This study was performed under the government contract at the Institute of Petroleum Chemistry, Siberian Branch, Russian Academy of Sciences, and was financially supported by the Ministry of Science and Higher Education of the Russian Federation. The HRTEM study of the catalysts was performed using the equipment of the Multiaccess Center “National Center for the Study of Catalysts.”

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Authors and Affiliations

  1. Institute of Petroleum Chemistry, Siberian Branch, Russian Academy of Sciences, 634021, Tomsk, Russia

    Zh. B. Budaev, L. L. Korobitsyna, A. A. Stepanov & A. V. Vosmerikov

  2. Tomsk State University, 634050, Tomsk, Russia

    Zh. B. Budaev & A. V. Vosmerikov

  3. Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, Russia

    E. Yu. Gerasimov

Authors
  1. Zh. B. Budaev
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  2. L. L. Korobitsyna
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  3. A. A. Stepanov
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  4. E. Yu. Gerasimov
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  5. A. V. Vosmerikov
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Correspondence to A. V. Vosmerikov.

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Budaev, Z.B., Korobitsyna, L.L., Stepanov, A.A. et al. Physicochemical and Catalytic Properties of the Mo–Zr/ZSM-5 Catalysts of Methane Dehydroaromatization. Russ. J. Phys. Chem. 97, 2405–2414 (2023). https://doi.org/10.1134/S0036024423110055

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