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Comparison of Physicochemical Properties and Catalytic Activity in the m-Xylene Isomerization of Catalysts Based on ZSM-12 Zeolites Prepared at Hydrothermal Conditions and under the Action of Microwave Radiation

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Abstract

The properties of ZSM-12 zeolites prepared under hydrothermal conditions and microwave radiation influence were studied. The prepared zeolites are characterized by a wide range of physicochemical methods of analysis: X-ray diffraction analysis, low-temperature nitrogen adsorption/desorption, scanning electron microscopy, solid-state 27Al and 29Si NMR spectroscopy, infrared spectroscopy, temperature-programmed desorption of ammonia, infrared spectroscopy of adsorbed pyridine, and X-ray fluorescence elemental analysis. The calcined zeolites were impregnated with 0.5 wt % Pt, which performs the hydrogenation function in the reaction under study. The obtained materials were studied in the m-xylene isomerization reaction under the following conditions: Т = 300–440°С, WHSV = 1 h–1, Р(Н2) = 10 atm. It was found that, on the ZSM-12 MW catalyst, owing to its high acidity and fine particles, which promote high mass transfer, it is possible to increase the yields of m-xylene isomers, in particular p-xylene, to 36–65%.

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ACKNOWLEDGMENTS

The work was carried out using the equipment of the Center for Collective Use “Analytical Center for the Problems of Deep Refining of Oil and Petrochemistry” of the Institute of Petroleum Engineering, Russian Academy of Sciences.

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Authors and Affiliations

  1. Moscow State University, 119991, Moscow, Russia

    D. E. Tsaplin, L. A. Kulikov, S. V. Egazar’yants & E. A. Karakhanov

  2. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, 119991, Moscow, Russia

    D. E. Tsaplin, V. A. Ostroumova & E. R. Naranov

Authors
  1. D. E. Tsaplin
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  2. V. A. Ostroumova
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  3. L. A. Kulikov
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  4. E. R. Naranov
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  5. S. V. Egazar’yants
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  6. E. A. Karakhanov
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Contributions

D.E. Tsaplin: synthesis of zeolites and catalysts based on them; V.A. Ostroumova: generalization of the results; L.A. Kulikov: catalytic experiments; E.R. Naranov: physicochemical analyzes by the methods of low-temperature adsorption–desorption of nitrogen, solid-state nuclear magnetic resonance spectroscopy on 27Al and 29Si nuclei; S.V. Egazar’yants: physicochemical analyzes by means of thermoprogrammed desorption of ammonia, infrared spectroscopy of adsorbed pyridine, and X-ray fluorescence spectroscopy; E.A. Karakhanov: formulation of the goals and objectives of the study for designing the synthesis of zeolite in microwave conditions and the selection of experimental conditions.

Corresponding authors

Correspondence to D. E. Tsaplin or V. A. Ostroumova.

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The authors declare that they have no conflicts of interest requiring disclosure in this article.

Additional information

Translated from Zhurnal Prikladnoi Khimii, No. 9, pp. 1204–1213, January, 2021 https://doi.org/10.31857/S0044461821090103

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Tsaplin, D.E., Ostroumova, V.A., Kulikov, L.A. et al. Comparison of Physicochemical Properties and Catalytic Activity in the m-Xylene Isomerization of Catalysts Based on ZSM-12 Zeolites Prepared at Hydrothermal Conditions and under the Action of Microwave Radiation. Russ J Appl Chem 94, 1292–1301 (2021). https://doi.org/10.1134/S1070427221090123

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