Abstract
The acid and catalytic properties of the modified MFI zeolite catalysts during the conversion of the propane–butane fraction of the associated petroleum gases into the aromatic hydrocarbons were studied. It was established that the high-silica zeolites synthesized with the new structure-forming additive of the alcohol fraction (ZKE-AF) belong to the high-silica MFI zeolites. The resulting zeolites were modified by 1–5 wt. % additives consisting of zinc oxide and sulfide. The influence of the modifying additive concentration containing zinc oxides and sulfides in an amount of 1–5% on the acid and catalytic properties of the catalysts in the conversion process of lower C3–C4 alkanes into liquid hydrocarbons was studied. The research of the acid properties of the modified zeolite catalysts by thermal desorption of ammonia showed that the total concentrations of the acidic centers of H-ZKE-AF modified by 3% and 5% ZnO increased. It was found that the highest yield of liquid hydrocarbons was on the zeolite catalysts modified by 3% and 5% ZnS, and is 60.6% and 60.5%, respectively, which is 9% more than in the initial H-ZKE-AF. The activity of the zeolite catalysts modified by zinc oxide and zinc sulfide was in correlation with their acid properties.
Highlights
The works [8,9,10,11,12,13,14] demonstrate that the high-silica zeolites of the types MFI and ZSM-5 modified by gallium, zinc, molybdenum, and rhenium are most active and selective in the process of conversion of lower C1 –C6 alkanes to arenes
It has been discovered that the methods for the production of the high-silica zeolites of the type ZSM-5 and introduction of the zeolite additives and their nature influence the yield and selectivity of the aromatic hydrocarbon formation from the lower alkanes [18,19,20,21]
The the organic structure-forming additive of alcohol fraction is taken in excess no more than 2–3%
Summary
Lower C3 –C4 alkanes are the main components of the propane–butane fraction of natural and associated petroleum gases and cheap hydrocarbon feedstocks for the preparation of lowerC2 –C4 olefins [1,2,3], aromatic hydrocarbons [4,5,6,7,8], and other valuable petrochemical products [9,10,11,12].The microporous zeolite catalysts of the MFI type could be the most promising materials for the conversion of lower C3 –C4 alkanes to lower olefins and aromatic hydrocarbons, as they exhibit high activity and selectivity in dehydrogenation, isomerization, dehydrocyclization, and cracking reactions of various organic compounds [13,14,15,16,17,18,19,20].The works [8,9,10,11,12,13,14] demonstrate that the high-silica zeolites of the types MFI and ZSM-5 modified by gallium, zinc, molybdenum, and rhenium are most active and selective in the process of conversion of lower C1 –C6 alkanes to arenes. The microporous zeolite catalysts of the MFI type could be the most promising materials for the conversion of lower C3 –C4 alkanes to lower olefins and aromatic hydrocarbons, as they exhibit high activity and selectivity in dehydrogenation, isomerization, dehydrocyclization, and cracking reactions of various organic compounds [13,14,15,16,17,18,19,20]. It has been discovered that the methods for the production of the high-silica zeolites of the type ZSM-5 and introduction of the zeolite additives and their nature influence the yield and selectivity of the aromatic hydrocarbon formation from the lower alkanes [18,19,20,21].
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