Influence of the Binder Type on the Activity of Pt-Containing Catalysts Based on MFI Zeolite in Isomerization of the Aromatic С8 Fraction

One of the steps in scaling the technology for the synthesis of zeolite-containing catalysts from the laboratory to commercial level is support forming. In this study, halloysite nanotubes and aluminum oxide were used as binders for preparing a support based on MFI (ZSM-5) zeolite. The Pt catalysts...

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Published inPetroleum chemistry Vol. 64; no. 2; pp. 278 - 289
Main Authors Kireev, G. A., Demikhova, N. R., Zatsepina, L. D., Smirnova, E. M., Gushchina, Yu. F., Chudakov, Ya. A., Ivanov, E. V., Glotov, A. P.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.02.2024
Springer Nature B.V
Subjects
Aluminum
Aluminum oxide
Catalysts
Chemical synthesis
Chemistry
Chemistry and Materials Science
Disproportionation
Ethylbenzene
Hydrocracking
Industrial Chemistry/Chemical Engineering
Isomerization
Transalkylation
Xylene
Zeolites
xylene
ZSM-5 zeolite
isomerization of xylenes
catalyst supports
ethylbenzene
extrusion
halloysite nanotubes
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Summary:One of the steps in scaling the technology for the synthesis of zeolite-containing catalysts from the laboratory to commercial level is support forming. In this study, halloysite nanotubes and aluminum oxide were used as binders for preparing a support based on MFI (ZSM-5) zeolite. The Pt catalysts (Pt/ZSM-5/Al 2 O 3 and Pt/ZSM-5/Hall) were tested in isomerization of the aromatic C 8 fraction. The forming of supports influenced not only mechanical but also physicochemical properties of the catalysts. On introducing binders into the catalytic system, the fraction of mesopores in the total pore volume of the supports increased, the acidity of the samples decreased, and the ratio of the amounts of the weak and strong acid sites changed. The use of aluminum oxide and halloysite as binders leads to different pathways of the transformation of the aromatic feedstock. The main side reactions observed in the presence of Pt/ZSM-5/Al 2 O 3 and Pt/ZSM-5/Hall catalysts are hydrocracking of alkylaromatic hydrocarbons and their transalkylation/disproportionation, respectively. The best results were obtained at 380°C and feed space velocity of 6 h –1 with Pt/ZSM-5/Hall: p -/ о -xylene ratio 1.05, loss of xylenes 4.31%, and ethylbenzene conversion 34%.
ISSN:0965-5441
1555-6239
DOI:10.1134/S0965544124030058