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Influence of the Kind of the Tin Precursor on the Properties of Pt/Sn–Al2O3–Cl Heptane Reforming Catalysts

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Abstract

The influence exerted by the kind of the tin precursor [SnCl4·5H2O or H2Sn(OH)6] and by the Cl– content (0.86–0.97 wt %) on the adsorption and catalytic properties of Pt sites in Pt/Sn–Al2O3–Cl heptane reforming catalysts was studied. The kind of the Sn precursor does not significantly influence the dispersity of the Pt particles. Among Pt sites, electron-deficient Pt forms prevail in the presence of Sn and at increased Cl– content. The acidity of the surface of the Pt/Al2O3–Cl catalyst increases on introducing Sn and with an increase in the Cl– content owing to strong acid sites. The catalyst containing 0.2 wt % Sn from H2Sn(OH)6 and 0.86 wt % Cl– exhibits the highest selectivity of the heptane aromatization and slightly increased selectivity of the С1–4 gas formation.

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Fig. 1.

Notes

  1. Ptσ sites are few-ligand platinum clusters of the composition PtClхOyLx, which are systems of several platinum atoms in oxidation states from +1 to +2, realized owing to the presence of electronegative chlorine and oxygen atoms in the platinum coordination sphere [17].

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ACKNOWLEDGMENTS

The authors are grateful to Cand. Sci. (Chem.) A.V. Babenko for analyzing catalysts containing platinum and tin, to Cand. Sci. (Chem.) A.V. Vasilevich for performing thermogravimetric experiments, to G.G. Savel’eva for measuring the nitrogen adsorption isotherms, to I.V.Muromtsev for performing X-ray diffraction analysis, to L.I. Frolova for determining the Cl– content of the samples, to G.A. Ponomareva for performing O2–H2 titration experiments, and to A.A. Bocharov for helping in catalytic trials.

The physicochemical properties of catalysts were studied using the equipment of the Center for Shared Use National Center for Studying Catalysts.

Funding

The study was financially supported by the Ministry of Science and Higher Education of the Russian Federation within the framework of the government assignment for the Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences (project АААА-А21-121011890074-4).

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Authors and Affiliations

  1. Center for New Chemical Technologies, Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, 644040, Omsk, Russia

    V. Yu. Tregubenko, T. I. Gulyaeva & A. S. Belyi

Authors
  1. V. Yu. Tregubenko
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  2. T. I. Gulyaeva
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  3. A. S. Belyi
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Contributions

V.Yu. Tregubenko: participation in setting the study, synthesis of the samples, and collection, analysis, and processing of the results of physicochemical studies and catalytic trials; T.I. Gulyaeva: experiments on studying the acid properties of the catalysts and interpretation of the data on nitrogen adsorption and desorption and on temperature-programmed NH3 desorption; A.S. Belyi: concept of the study.

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Correspondence to V. Yu. Tregubenko.

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The authors declare that they have no conflict of interest.

Additional information

Translated from Zhurnal Prikladnoi Khimii, No. 10, pp. 1273–1281, October, 2022 https://doi.org/10.31857/S0044461822100061

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Tregubenko, V.Y., Gulyaeva, T.I. & Belyi, A.S. Influence of the Kind of the Tin Precursor on the Properties of Pt/Sn–Al2O3–Cl Heptane Reforming Catalysts. Russ J Appl Chem 95, 1564–1572 (2022). https://doi.org/10.1134/S107042722210007X

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