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Disproportionation of Toluene on ZSM-12 Zeolites

  • Catalysis
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Abstract

The properties of ZSM-12 zeolites (SiO2/Al2O3 = 70) synthesized under hydrothermal conditions have been studied. The prepared samples were examined by X-ray phase analysis, low-temperature nitrogen adsorption–desorption, scanning electron microscopy, solid-state 27Al NMR spectroscopy, infrared spectroscopy, NH3 thermally programmed desorption, infrared spectroscopy of adsorbed pyridine, and X-ray fluorescence spectroscopy and investigated in the toluene disproportionation reaction under the following conditions: Т = 300–480°С, mass feedstock flow rate 1.5, 3, and 6 h–1, Р(Н2) = 10 atm. It was found that a ZSM-12 zeolite sample synthesized using monoethanol-N,N-dimethyl-N-ethylammonium bromide as a template is the most effective catalyst for the toluene disproportionation. It is shown that the toluene disproportionation occurs with the formation of benzene and a mixture of ortho-, meta-, para-xylenes. The fraction of the latter in the liquid reaction products was up to 50%.

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ACKNOWLEDGMENTS

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

Funding

The study was supported by a grant from the Russian Science Foundation (project no. 22-79-10294).

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Authors and Affiliations

  1. Moscow State University, 119991, Moscow, Russia

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

  2. Topchiev Institute of Petroleum Chemistry, 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. D. N. Gorbunov
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  4. L. A. Kulikov
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  5. E. R. Naranov
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  6. S. V. Egazar’yants
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Contributions

D.E. Tsaplin: carrying out the synthesis of zeolites in the sodium form and catalysts based on them; V.A. Ostroumova: carrying out ion exchange procedures to produce ammonium forms of zeolites; D.N. Gorbunov: carrying out catalytic experiments; L.A. Kulikov: carrying out physical and chemical analyzes by the X-ray phase analysis, low-temperature nitrogen adsorption-desorption, solid-state 27Al NMR spectroscopy; E.R. Naranov: carrying out physical and chemical analyzes using NH3-TPD, infrared spectroscopy of adsorbed pyridine and X-ray fluorescence spectroscopy; S.V. Egazaryants: formulation of the study goals on synthesis of zeolites and selection of conditions for catalytic experiments.

Corresponding authors

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

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The authors declare no conflict of interest.

Additional information

Translated from Zhurnal Prikladnoi Khimii, Nos. 11–12, pp. 1400–1409, August, 2022 https://doi.org/10.31857/S0044461822110056

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Tsaplin, D.E., Ostroumova, V.A., Gorbunov, D.N. et al. Disproportionation of Toluene on ZSM-12 Zeolites. Russ J Appl Chem 95, 1767–1775 (2022). https://doi.org/10.1134/S1070427222120035

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