STUDY OF THE EFFECT OF H-ZSM-5 ZEOLITE ACIDITY ON THE PROCESS OF CATALYTIC TRANSFORMATION OF N-BUTANOL INTO HYDROCARBONS
Abstract
The article is devoted to study of influence of the H-ZSM-5 zeolite acdity in the n-butanol to hydrocarbons catalytic transformation process. Four H-ZSM-5 samples were synthesized by hydrothermal method using different gel compositions. Synthesized samples were characterized by similar values of the micropores and mesopores specific surface areas 300-318 m2/g and 59-82 m2/g. However, the Si/Al ratio in the samples varied in the range from 24 to 270, which contributed to a change in surface acidity from 0.1 to 1.6 mmol/g. Obtained samples with different acidic properties were tested in butanol to hydrocarbons transformation process provided at 400°C and 0.3 kg(BuOH)/((kg(Cat)·h) weight hourly space velocity. The novelty of the article is the determination of the correlation between the acidity of H-ZSM-5 and its activity in n-butanol catalytic transformation. It was found that an increase in the acidity of H-ZSM-5 zeolite surface promotes an increase in the rate of n-butanol transformation from 0.16 kg (BuOH)/((kg(Cat)·h) to 0.27 kg(BuOH)/((kg(Cat)·h). Zeolite samples with acid site concentrations of 0.1 mmol/g and 0.6 mmol/g were characterized by the absence of deactivation within 24 h, zeolite samples with the acidity of 1.2 mmol(NH3)/g and 1.6 mmol(NH3)/g were characterized by a decrease in activity by 15% and 52% due to an increase in polyaromatic hydrocarbons formation rate. An increase in the acidity of the zeolite from 0.1 to 1.6 mmol(NH3)/g leads to an increase in the aromatic hydrocarbons concentration from 12 wt.% to 55 wt.%. An increase in alkanes concentration from 14 wt.% to 32 wt.% was also observed, while the concentration of unsaturated hydrocarbons decreased from 74 wt.% to 11 wt.%. Based on the obtained data, the correlation of the initial zeolite activity in n-butanol transformation into hydrocarbons on the concentration of the active sites was determined.
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