ACIDIC AND CATALYTIC PROPERTIES OF Mg-CONTAINING ZEOLITE CATALYST IN THE PROPANE CONVERSION TO OLEFINIC HYDROCARBONS
Abstract
In this work, we studied the conversion of propane to olefinic hydrocarbons on a zeolite catalyst of the ZSM-5 structural type modified with magnesium. Lower olefins (С2-С4) are one of the key raw materials for petrochemical processes, in particular in the production of polymeric materials (polyethylene, polypropylene), as well as various valuable products: ethylene-butene copolymers, methyl-tert-butyl ether, acrylonitrile, etc. Constant growth in demand for lower olefins is largely determined by the rapid increase in the consumption of polyethylene and polypropylene and the expansion of their technological application. The catalytic conversion of lower alkanes to olefinic hydrocarbons using zeolite-containing systems is one of the promising methods for obtaining lower monomers. The acidic properties of Mg-containing zeolite catalysts were studied by thermally programmed desorption of ammonia, and it was found that the catalysts differ from each other in the distribution and ratio of acid sites of different types. It has been shown that the introduction of magnesium oxide into the composition of the catalyst leads to an increase in the activity and selectivity of the catalyst with respect to the formation of olefinic hydrocarbons from propane. The dependence of the activity and selectivity of catalysts on the content of magnesium in them has been established. It was found that the maximum amount of olefinic hydrocarbons is formed in the presence of zeolite containing 4.0% magnesium oxide. A study was made of the time of stable operation of the most active catalytic system in the process of obtaining olefinic hydrocarbons from propane. It is shown that after 96 h of continuous operation of the 4.0 % MgO/HSZ-100 catalyst, the selectivity for the formation of olefinic hydrocarbons is more than 68% at a propane conversion of 45%.
For citation:
Vosmerikov A.A., Vosmerikova L.N., Vosmerikov A.V. Acidic and catalytic properties of Mg-containing zeolite catalyst in the propane conversion to olefinic hydrocarbons. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2023. V. 66. N 11. P. 42-49. DOI: 10.6060/ivkkt.20236611.2t.
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