STUDY OF THE INFLUENCE OF THE TEMPLATE ON THE PHYSICOCHEMICAL AND CATALYTIC PROPERTIES OF Mo-CONTAINING ZEOLITE CATALYSTS FOR NON-OXIDATIVE METHANE CONVERSION

This work is devoted to the search for new structure-forming additives – templates for the synthesis of pentasil-type zeolites. Pentaerythritol, urea, choline chloride, as well as binary and ternary systems of deep eutectic solvents consisting of mixtures of these components were used as structure-forming additives. Deep eutectic solvents have low melting point and vapor pressure, and are characterized by high thermal and chemical stability, and allow to synthesize the zeolites in more environmentally friendly conditions compared to currently use chemical compounds. It has been established that the presence of urea is required to obtain zeolite as a component of a structure-forming additive in deep eutectic solvents. IR spectroscopy and X-ray phase analysis methods confirmed that the synthesized zeolites belong to the pentasil family and determined their crystallinity. The low-temperature nitrogen adsorption method determined the texture characteristics of the zeolites, the scanning electron microscopy method showed the shape and size of zeolite particles, the temperature-programmed ammonia desorption method investigated the strength and concentration of acid sites in the synthesized zeolite samples and showed the dependence of these characteristics on the type of template used. The catalytic activity of molybdenum-containing catalysts obtained on the basis of synthesized zeolites by dry mechanical mixing of nanosized molybdenum powder and the corresponding powder of synthesized zeolite was studied in the process of nonoxidative conversion of methane. It was shown that the use of binary and ternary systems as templates in the synthesis of zeolites leads to the production of more active catalysts compared to catalysts obtained using individual components included in the composition of deep eutectic solvents. For citation: Stepanov A.A., Korobitsyna L.L., Velichkina L.M., Altunina L.K. Study of the influence of the template on the physicochemical and catalytic properties of Mo-containing zeolite catalysts for non-oxidative methane conversion. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2025. V. 68. N 8. P. 41-51. DOI: 10.6060/ivkkt.20256808.14t.