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Different methods are used to prepare gallium-containing zeolites of a ZSM-5 structure. Their acidic and structural characteristics are investigated and the effect of the method of gallium introduction into a zeolite on distribution and ratio of acid sites of different strengths, as well as on pore volume and diameter is determined. The relationship between the localization of gallium introduced into a zeolite by different methods and its electronic state and the catalytic activity and selectivity of the resulting contacts in the course of propane aromatization is established. The Ga-containing zeolite prepared by impregnation is found to be the most efficient catalyst for conversion of propane into aromatic hydrocarbons.

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Abstract. Galloalumosilicates having ZSM-5 structure are manufactured from the alkali alumina silica gels via the method of hydrothermal crystallization using different organic templating agents. Their physico-chemical and acidic properties are investigated and their catalytic reactivity is determined in the course of propane conversion into aromatic hydrocarbons. The highest catalytic reactivity and stability are exhibited by the Ga-containing zeolite synthesized using hexamethylenediamine as a structure-forming additive.