The kinetic laws of the catalytic degidroaromatization reaction of methane
Annotatsiya
In this article, the effect of temperature and reaction rate on a catalyst consisting of [(MoO3)x·(ZrO2)y·(ZnO)z/HSZ], which has high productivity, selectivity, stability, robustness, activity, low cost and minimal coking properties, was studied for the catalytic dehydroaromatization of methane. The effect of reaction duration on methane conversion and the yield of target products was studied. In the case of catalytic aromatization of methane, at temperatures of 650-700°C, the yield of aromatic hydrocarbons is small, with methane conversion reaching the highest value 120 minutes after the start of the reaction. At 750 ℃, the highest conversion of methane is observed at 390 minutes of reaction. At 360 minutes of reaction between 650-750 ℃, aromatic hydrocarbons are formed in the highest yield. Over time, the decrease in the total conversion of methane is explained by the formation of coke on the surface of the catalyst and the increase in the yield of aromatic hydrocarbons by the increase in the amount of C2Hy−fragments. According to the conducted experimental studies, the concentration of hydrogen in the gaseous products of the catalytic dehydroaromatization of methane in the vapour phase increases with increasing reaction temperature, and the amount of saturated hydrocarbons and unsaturated hydrocarbons containing double bonds decreases. In the catalytic dehydroaromatization reaction of methane on the catalyst of a Mo-HSZ catalyst in the vapour phase, the conversion rate and the yield of aromatic hydrocarbons increase with increasing temperature and reach 32.3 and 25.2%, respectively, at 750 ℃. For the catalytic aromatization reaction of methane, the acidity centers of the catalyst obtained using ammonium bicarbonate are stronger than the acidity sites of the catalyst prepared by adding hexamethylenediamine. The effect of volume velocity on the reaction rate in the presence of a selected catalyst was studied.