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

IF 1.3 4区工程技术 Q3 CHEMISTRY, ORGANIC

Petroleum Chemistry Pub Date : 2024-06-14 DOI:10.1134/S0965544124030058

G. A. Kireev, N. R. Demikhova, L. D. Zatsepina, E. M. Smirnova, Yu. F. Gushchina, Ya. A. Chudakov, E. V. Ivanov, A. P. Glotov

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Abstract

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/Al₂O₃ and Pt/ZSM-5/Hall) were tested in isomerization of the aromatic C₈ 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/Al₂O₃ 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%.

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粘合剂类型对基于 MFI 沸石的含铂催化剂在芳香族 С8 馏分异构化中的活性的影响

要将含沸石催化剂的合成技术从实验室水平提升到商业水平，其中一个步骤就是形成载体。在本研究中，使用了埃洛石纳米管和氧化铝作为粘合剂来制备基于 MFI（ZSM-5）沸石的载体。铂催化剂（Pt/ZSM-5/Al2O3 和 Pt/ZSM-5/Hall）在芳香族 C8 馏分异构化中进行了测试。载体的形成不仅影响催化剂的机械性能，还影响其物理化学性能。在催化体系中引入粘合剂后，中孔在载体总孔容积中的比例增加，样品的酸度降低，弱酸位点和强酸位点的数量比发生变化。使用氧化铝和埃洛石作为粘合剂会导致芳香族原料发生不同的转化途径。在 Pt/ZSM-5/Al2O3 和 Pt/ZSM-5/Hall 催化剂存在下观察到的主要副反应分别是烷基芳烃的加氢裂化和它们的反烃化/歧化。Pt/ZSM-5/Hall 催化剂在 380°C 和进料空间速度为 6 h-1 时取得了最佳效果：p-/о-二甲苯比率为 1.05，二甲苯损失率为 4.31%，乙苯转化率为 34%。

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来源期刊

Petroleum Chemistry 工程技术-工程：化工

CiteScore

2.50

自引率

21.40%

发文量

102

审稿时长

6-12 weeks

期刊介绍： Petroleum Chemistry (Neftekhimiya), founded in 1961, offers original papers on and reviews of theoretical and experimental studies concerned with current problems of petroleum chemistry and processing such as chemical composition of crude oils and natural gas liquids; petroleum refining (cracking, hydrocracking, and catalytic reforming); catalysts for petrochemical processes (hydrogenation, isomerization, oxidation, hydroformylation, etc.); activation and catalytic transformation of hydrocarbons and other components of petroleum, natural gas, and other complex organic mixtures; new petrochemicals including lubricants and additives; environmental problems; and information on scientific meetings relevant to these areas. Petroleum Chemistry publishes articles on these topics from members of the scientific community of the former Soviet Union.