Year: 2026
Type: article
Abstract: Catalytic systems based on anion-modified zirconium dioxide and metalmodified HMFI zeolite were synthesized and the isomerization hydroconversion of n-hexane at atmospheric pressure and low temperature (160-230C) was studied on these systems.Tungsten, sulfate, orthophosphate, nitrate and perchlorate anions were taken as modifying anions.It is known that catalysts modified with nitrate and perchlorate anions quickly lose their activity during the reaction and the conversion of n-hexane on these catalysts, isoselectivity is not high.Although the catalyst modified with tungstate anions shows high activity, isoselectivity and stability, it operates at relatively high temperatures and is suitable for the conversion of C7 and higher alkanes.Although modification with sulfate anions leads to high activity of the catalyst, such catalysts lag behind catalysts treated with tungstate and orthophosphate in terms of stability and isoselectivity.Orthophosphate anions were chosen as the most optimal modifying anion.Catalysts modified with this anion were superior to catalysts modified with tungstate anion in terms of their operation at lower temperatures, and to catalysts modified with sulfate anion in terms of both isoselectivity and stability.An orthophosphate-modified catalyst was chosen as the most effective catalyst for the hydroconversion of n-hexane, and the regularities of the conversion of n-hexane on it were studied.The effect of the metal in the catalyst and the preliminary treatment of the catalyst in a hydrogen environment on its activity was investigated.It was found that the modification of zeolite with Co provides high isoselectivity on the catalyst, and the preliminary treatment of the catalyst containing Co in a hydrogen environment at 500C allows the transformation of n-hexane at 180C and in atmospheric pressure with a conversion of about 70% and an isoselectivity of more than 90% Keywords: anion modification, isomerization, sulfur anion, tungstate anion, orthophosphate anion, n-hexane, high-octane gasoline componentIsomerization of hydrocarbons is widely used in industry for the production of both fuels and petrochemicals.Isomerization is a chemical reaction that is a special type of molecular rearrangement that occurs with the breaking of bonds and the formation of new bonds.This is a
Source: PPOR
Language: English
Subfield: Inorganic Chemistry
Field: Chemistry
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W7127050822