Aromatization of Isophorone to 3,5-Xylenol over Cation-Exchanged Granulated Hierarchical Yh Zeolites

IF 1.1 4区工程技术 Q3 CHEMISTRY, ORGANIC

Petroleum Chemistry Pub Date : 2025-04-03 DOI:10.1134/S0965544125600572

V. Yu. Kirsanov, L. F. Korzhova, A. N. Khazipova, V. R. Bikbaeva, D. V. Serebrennikov, S. G. Karchevsky, B. I. Kutepov, N. G. Grigor’eva

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Abstract

A series of catalysts were prepared from a granulated hierarchical (micro–meso–macroporous) NaY_h zeolite: NaY_h, H-NaY_h, H-Y_h, Li-NaY_h, K-NaY_h, Ca-NaY_h, Mg-NaY_h, and La-NaY_h. Their physicochemical properties were characterized, and their catalytic activity and product selectivity were investigated in the aromatization of isophorone. The highest performance in the synthesis of 3,5-dimethylphenol was achieved in the presence of K-NaY_h, the catalyst distinguished both by the highest basicity among the tested samples and by low concentrations of weak Brønsted acid sites and Lewis acid sites. This sample exhibited a 3,5-dimethylphenol selectivity of 78.6% at an isophorone conversion of 98.9%. H-Y_h, H-NaY_h, Ca-NaY_h, Mg-NaY_h, and La-NaY_h provided the highest possible isophorone conversion (up to 100.0% at 400°C and 1 h^–1), with the reaction products mainly consisting of dimethylbenzenes and trimethylbenzenes (their selectivity reached up to 72.9 wt %). In the presence of low-activity samples (NaY_h and Li-NaY_h), the predominant products were methylbenzenes (dimethylbenzenes and trimethylbenzenes, 26.6–30.9%) and isophorone derivatives (β-isophorone and dihydroisophorone, 30.5–33.0%).

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异佛尔酮在阳离子交换的粒状分级Yh沸石上芳构化成3,5-二甲酚

以颗粒状（微-介-大孔）NaYh分子筛为原料制备了一系列催化剂：NaYh、H-NaYh、H-Yh、Li-NaYh、K-NaYh、Ca-NaYh、Mg-NaYh和La-NaYh。对它们的理化性质进行了表征，并研究了它们在异佛罗酮芳构化反应中的催化活性和产物选择性。在K-NaYh存在的情况下，合成3,5-二甲基苯酚的性能最高，该催化剂在测试样品中具有最高的碱度，并且具有低浓度的弱Brønsted酸位点和Lewis酸位点。该样品对3,5-二甲基苯酚的选择性为78.6%，对异佛酮的转化率为98.9%。H-Yh、H-NaYh、Ca-NaYh、Mg-NaYh和La-NaYh的异虫酮转化率最高（在400°C和1 h-1条件下可达100.0%），反应产物主要由二甲基苯和三甲基苯组成（其选择性可达72.9 wt %）。在低活性样品（NaYh和Li-NaYh）存在的情况下，主要产物是甲苯（二甲基苯和三甲基苯，26.6-30.9%）和异佛尔酮衍生物（β-异佛尔酮和二氢异佛尔酮，30.5-33.0%）。

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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.