Synthesis of Zn Aluminosilicates and Their Physicochemical and Catalytic Properties in the Aromatization of Propane

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

doi:10.1134/s0036024422030268

Cited by 2 publications

(2 citation statements)

References 14 publications

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“…The acidic properties of the obtained catalysts were studied with the method of the thermoprogrammed desorption of ammonia (TPD-NH 3 ), which makes it possible to determine the number and the strength distribution of acid sites [29]. The samples were loaded into a quartz tubular reactor, were pretreated under Ar flow at 600 • C for 1 h, and then cooled down to 50 • C. The adsorption of ammonia was carried out at 100 • C until the sample was completely saturated; then, the physically adsorbed ammonia was removed using helium purging at the same temperature for 2 h, after which desorption was carried out in the temperature range 100-550 • C at a temperature rise rate of 10 • C/min.…”

Section: Methodsmentioning

confidence: 99%

Investigation of the Properties of Mo/ZSM-5 Catalysts Based on Zeolites with Microporous and Micro–Mesoporous Structures

2023

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The dehydroaromatization of methane (MDA) is of great interest as a promising process for processing natural and associated petroleum gases, the main component of which is methane. The rapid loss of catalyst activity because of coke formation hinders the introduction of the DHA methane process into the industry. Therefore, the aim of this research was to find ways to improve Mo/ZSM-5 catalysts for MDA. The paper presents the results of the synthesis of high-silica zeolites of the ZSM-5 type with microporous and micro–mesoporous structures, the preparation of Mo/ZSM-5 catalysts based on them, and the study of the physicochemical and catalytic properties of the obtained samples during the non-oxidative conversion of methane into aromatic hydrocarbons. Zeolite catalysts were investigated using IR spectroscopy, X-ray diffraction, TPD-NH3, SEM, HR-TEM, and N2 adsorption. It was found that the addition of carbon black in the stage of the synthesis of zeolite type ZSM-5 did not lead to structural changes, and the obtained samples had a crystallinity degree equal to 100%. The creation of the micro–mesoporous structure in Mo/ZSM-5 catalysts led to an increase in their activity and stability in the process of methane dehydroaromatization. The highest conversion of methane was observed on a 4.0%Mo/ZSM-5 catalyst prepared based on zeolite synthesized using 1.0% carbon black and was 13.0% after 20 min of reaction, while the benzene yield reached 7.0%. It was shown using HR-TEM that a more uniform distribution of the active metal component was observed in a zeolite catalyst with a micro–mesoporous structure than in a microporous zeolite.

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Section: Methodsmentioning

confidence: 99%

Investigation of the Properties of Mo/ZSM-5 Catalysts Based on Zeolites with Microporous and Micro–Mesoporous Structures

2023

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show abstract

“…The acidic properties of the obtained catalysts were studied by the method of thermoprogrammed desorption of ammonia (TPD-NH3), which made it possible to determine the number and the strength distribution of acid sites [29]. The adsorption of ammonia was carried out at 100 °C until the sample was completely saturated, then the physically adsorbed ammonia was removed by helium purging at the same temperature for 2 h, after which desorption was carried out in the temperature range 100-550 °C at a temperature rise rate of 10 K/min.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

Investigation of the Properties of Mo/ZSM-5 Catalysts Based on Zeolites With Microporous and Micro-Mesoporous Structure

Степанов¹,

Коробицына²,

Восмериков³

2023

Preprint

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Dehydroaromatization of methane (MDA) is of great interest as a promising process for processing natural and associated petroleum gases, the main component of which is methane. The rapid loss of catalyst activity because of coke formation hinders the introduction of the DHA methane process into industry. Therefore, the aim of the research was to find ways to improve Mo/ZSM-5 catalysts for MDA. The paper presents the results of the synthesis of high-silica zeolites of the ZSM-5 type with a microporous and micro-mesoporous structure, the preparation of Mo/ZSM-5 catalysts based on them, and the study of the physicochemical and catalytic properties of the obtained samples during the non-oxidative conversion of methane into aromatic hydrocarbons. Zeolite catalysts were investigated by IR spectroscopy, X-ray diffraction, TPD-NH3, SEM, HR-TEM, N2-adsorption. It was found that the addition of carbon black at the stage of synthesis of zeolite type ZSM-5 does not lead to structural changes, the obtained samples have a crystallinity equal to 100%. The creation of the micro-mesoporous structure in Mo/ZSM-5 catalysts lead to an increase in their activity and stability in the process of methane dehydroaromatization. The highest conversion of methane is observed on a 4.0%Mo/ZSM-5 catalyst prepared based on of zeolite synthesized using 1.0% carbon black, and is 13.0% in 20 minutes of reaction, while the benzene yield reaches 7.0%. It has been shown by HR-TEM that a more uniform distribution of the active metal component is observed in a zeolite catalyst with a micro-mesoporous structure than in a microporous zeolite.

show abstract

Synthesis of Zn Aluminosilicates and Their Physicochemical and Catalytic Properties in the Aromatization of Propane

Cited by 2 publications

References 14 publications

Investigation of the Properties of Mo/ZSM-5 Catalysts Based on Zeolites with Microporous and Micro–Mesoporous Structures

Investigation of the Properties of Mo/ZSM-5 Catalysts Based on Zeolites with Microporous and Micro–Mesoporous Structures

Investigation of the Properties of Mo/ZSM-5 Catalysts Based on Zeolites With Microporous and Micro-Mesoporous Structure

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