Nature of the Active Centers of In-, Zr-, and Zn-Aluminosilicates of the ZSM-5 Zeolite Structural Type

Зайковский, В. И.; Восмерикова, Л. Н.; Восмериков, А. В.

doi:10.1134/s0036024418040349

Cited by 6 publications

(3 citation statements)

References 3 publications

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“…As such, in the alkylation reaction of the distillate fraction of T-30 oil with catalytic cracking gases, both Bronsted and Lewis acid sites participate, but Lewis acid sites to a greater extent. This is corroborated by studies examining changes in the ratio of acid sites in zeolites upon the introduction of metals during various reactions [9,10].…”

Section: Discussionmentioning

confidence: 74%

Research and Application of Modified ZSM-5 for the Process of Alkylation of Oil Distillate Fractions

Huseynova,

Aliyeva,

Gаsimоvа

2023

Catal Res

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In the oil distillate fraction alkylation process, a modified Zr zeolite ZSM-5 was obtained and studied. The modification was executed using a method that impregnated ZSM-5 with a 5% solution of ZrOCl2∙6H2O. X-ray diffraction studies were conducted on zeolite ZSM-5, zirconyl chloride modifier ZrOCl2∙6H2O, and modified zeolite ZSM-5-ZrO2, which was calcined at temperatures of 200, 400, and 550°C. The results revealed that the phase composition of modified ZSM-5-ZrO2 zeolite samples varied depending on the calcination temperature. It was determined that only at a temperature of 550°C did the modified ZSM-5 catalyst contain three phases belonging to ZrSi24O50, ZrO2, and ZSM-5. The emergence of the ZrO2 phase occurred at a calcination temperature of 550°C. An increase in temperature from 200 to 550°C facilitated the transition of the amorphous phase to the crystalline phase. The crystal structure of the ZSM-5-ZrO2 catalyst, calcined at 550°C, contributed to a rise in its activity. Consequently, during alkylation with catalytic cracking gases, the viscosity-temperature properties of the T-30 turbine oil distillate fraction significantly improved (the viscosity index increased from 49.9 to 137). An increase in zeolite ZSM-5 activity was demonstratd due to the introduction of zirconium and an elevated calcination temperature to 550°C.

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Section: Discussionmentioning

confidence: 74%

Research and Application of Modified ZSM-5 for the Process of Alkylation of Oil Distillate Fractions

Huseynova,

Aliyeva,

Gаsimоvа

2023

Catal Res

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“…With strong demands on aromatics, BTX could be produced from C6–C8 hydrocarbons via an aromatization process. − Meanwhile, BTX could also be produced from more available sources such as fossils, coal, shale gas, and biomass. ZSM-5 has been demonstrated to be the main active component of the catalysts for hydrocarbon aromatization, light alkane aromatization, methanol to aromatics (MTA), and biomass to aromatics, as a consequence of excellent shape selectivity of MFI topological structure and tunable acidity. − To further improve the selectivity toward aromatics, modifications on H-ZSM-5 catalysts have been widely developed with a focus on metal modification with Zn, Ga, Pt, Mo, Ni, La, Cu, Fe, and Ag included, among which Ga exhibited superior aromatization performance and stability. − …”

Section: Introductionmentioning

confidence: 99%

Ga Substitution during Modification of ZSM-5 and Its Influences on Catalytic Aromatization Performance

Xin

Xing

Gao

et al. 2019

Ind. Eng. Chem. Res.

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ZSM-5 zeolites, Ga modified via different methods (in situ hydrothermal synthesis, mechanical mixing, incipient wetness impregnation, solid-state ion exchange, and liquid phase ion exchange), were systematically investigated by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), 29Si, 27Al, and 71Ga magic-angle spinning (MAS) NMR, and H2 temperature-programmed reduction (H2-TPR). It is important to prove that both impregnation and liquid phase ion exchange could facilitate the incorporation of Ga species into the framework in addition to in situ hydrothermal synthesis. The liquid phase ion exchange method drove part of the Ga species into the framework, and it was further migrated into the framework by drying, while the incipient wetness impregnation method promoted part of the Ga species into the framework only during the calcination process. In the n-heptane catalytic aromatization procedure on the fixed bed, Ga modified ZSM-5 by in situ hydrothermal synthesis showed the highest benzene, toluene, ethylbenzene and xylene (BTEX) selectivity, owing to the increased strong Lewis acidic sites and mesopore volumes induced by the framework Ga species.

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“…Наиболь-шие успехи связаны с использованием цеолитов структурного типа MFI [1]. В частности, с использованием таких катализаторов удается превращать низшие алканы -компоненты природного и попутного нефтяного газов в ароматические углеводороды (АрУ) [2][3][4][5]. Целью настоящей работы явилось изучение закономерностей превращения С 3 , С 4 -алканов в ароматические углеводороды на цеолитных катализаторах, модифицированных активными металлическими компонентами.…”

Section: Introductionunclassified

Production of Aromatic Hydrocarbons from C3, C4-alkanes Over Zeolite Catalysts

A.¹,

N.²,

G.³

et al. 2019

J. Sib. Fed. Univ. Chem.

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An aluminosilicate and a galloaluminosilicate of MFI structure are synthesized by the hydrothermal method from alkaline aluminosilicates. Structural, acidic, and catalytic properties of synthesized zeolites are investigated in the course of dehydrocyclization of lower alkanes. It is found out that aromatic hydrocarbons are formed in their highest amount when butane is converted over the galloaluminosilicate, while the lowest amount of them is resulted from the conversion of propane over the aluminosilicate. It is shown that to achieve the nigh conversion of propane and butane and the yield of desired product in the presence of the catalysts under study, the process temperature during the propane conversion should be 50 degrees higher under the same other reaction conditions.

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Nature of the Active Centers of In-, Zr-, and Zn-Aluminosilicates of the ZSM-5 Zeolite Structural Type

Cited by 6 publications

References 3 publications

Research and Application of Modified ZSM-5 for the Process of Alkylation of Oil Distillate Fractions

Research and Application of Modified ZSM-5 for the Process of Alkylation of Oil Distillate Fractions

Ga Substitution during Modification of ZSM-5 and Its Influences on Catalytic Aromatization Performance

Production of Aromatic Hydrocarbons from C3, C4-alkanes Over Zeolite Catalysts

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