Conversion of Light Hydrocarbons on Modified Zeolite Catalysts

Abstract

The physicochemical properties of zeolite-containing catalysts modified via introduction of zinc, manganese, lanthanum, and phosphorus, as well as their activity in the aromatization of propane–butane and propane–propylene fractions, are studied with temperature-programmed desorption of ammonia, transmission electron microscopy, and BET. The maximum amount of aromatic hydrocarbons (40.3%) is formed during the processing of the propane–butane fraction on a Zn–La–Mn–ZSM–Al2O3 catalyst at 600°C, whereas the selectivity for aromatic hydrocarbons is 51.3%. When the propane–propylene fraction is processed within 400–600°C, the yield of aromatic hydrocarbons on the Zn–La–Mn–ZSM–Al2O3 catalyst is significantly higher in comparison with any of the other catalysts studied. The activity of the catalysts in the processing of light hydrocarbons depends on the structure and the state of the active sites.