Effect of phosphorus content on the physicochemical and catalytic properties of pentasils in the ethylbenzene disproportionation reaction

Mamedov, S. E.; Ахмедов, Э. И.; Ismailova, S. B.; Shamilov, N. T.

doi:10.1134/s0965544109020054

Cited by 4 publications

(2 citation statements)

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“…The Texture of a zeolite, the type of acid sites, and the reaction medium significantly influence the activity and selectivity of disproportionation reactions of toluene and diethylbenzene, which result in the formation of dialkylbenzenes, including the distribution of para-, m-, and o-isomers (Cejka et al, 2002;Suganuma et al, 2017;Albahar et al, 2020;Mamedov et al, 2009;Raj et al, 2007;Zilkova et al, 2009). The majority of the papers on disproportionation, transalkylation of toluene, and C8 aromatic hydrocarbons are devoted to studying the effects of acid sites, reaction mechanisms, and the type of zeolite catalysts.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the content of p-DEB in the reaction products exceeds the thermodynamic equilibrium value on large-pore zeolites during disproportionation of EB. Hence, in order to enhance p-DEB selectivity, it is indispensable to passivate strong acid sites on the zeolite surface and reduce their pore size by chemical modification (Suganuma et al, 2017;Mamedov et al, 2009;Zhu et al, 2006;Mitsuyoshi et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

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STUDY OF CATALYTIC BEHAVIOURS OF THE SPINEL STRUCTURE NdxMg1- xAl2O4 COMPOSITION WITH ZSM-5 ZEOLITE IN ETHYLBENZENE DISPROPORTIONATION

Mahmudova

2024

NMCA

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Nanosized (10–15 nm) powders of spinel structures NdxMg1–xAl2O4 were obtained by low-temperature combustion of aluminium, magnesium, neodymium nitrate solutions, diethylmalonate, and hydrazine monohydrate with further calcination of nanopowders at 1000 °C, which were used in the preparation of catalytic compositions with ZSM-5 zeolite. The obtained catalytic compositions were characterized by X-ray diffraction, pyridine adsorption, and low-temperature nitrogen adsorption. The acidic properties and porosity of the catalysts were altered by controlling the concentration of nanopowder (1.0–7.0 wt.%) in the catalytic composition. The interaction of the modifier with HZSM-5 zeolite leads to a decrease in specific surface area and pore volume, as well as reduse of strong Bronsted acid sites (B) and an increase in the concentration of medium Lewis acid sites (L), resulting in a change in the B/L ratio from 3.61 to 0.23. The ongoing variations contributed mainly to an enhancement of the para-selectivity of the catalytic composition in the ethylbenzene disproportionation reaction. The catalytic composition of 5% Nd0.1Mg0.9Al2O4 with a pore volume of 0.15 cm3/g and an acid site B/L ratio of 0.27 demonstrates a maximum selectivity to p-diethylbenzene of 75.6% with a conversion of ethylbenzene of 23.7%.

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