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https://dx.doi.org/10.24412/23...
Research . 2021
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Физико-химические свойства цинкалюмосиликатов с микромезопористой структурой и их активность в процессе ароматизации пропана

PHYSICO-CHEMICAL PROPERTIES OF ZINCALUMOSILICATES WITH A MICRO-MESOPOROUS STRUCTURE AND THEIR ACTIVITY IN THE COURSE OF PROPANE AROMATIZATION

Физико-химические свойства цинкалюмосиликатов с микромезопористой структурой и их активность в процессе ароматизации пропана

Abstract

This paper presents the results of studies on the effect of the second template (carbon black) on the textural, acidic, and catalytic properties of Zn-aluminosilicates with the MFI zeolite structure during the conversion of propane into aromatic hydrocarbons. The analysis by the method of thermoprogrammed ammonia desorption has revealed that the concentration of acidic sites of the resulted zeolite increased with an increase in the amount of carbon black added during the synthesis of zeolite. It was shown that the addition of carbon black to the crystallization gel during the synthesis of zinc aluminosilicate led to an increase in its total pore volume resulted from an increase in the volume of mesopores. The amount of coke deposits formed on the surface of zinc aluminosilicates during the propane aromatization reaction was determined by the method of differential thermal analysis. It has been found out that the optimal ratio between the number of active sites of the catalyst and the volume of formed mesopores was achieved over a zinc aluminosilicate prepared on the basis of a zeolite with the addition of 1.0% carbon black at the stage of its synthesis. This led to a decrease in the rate of coke formation and thus, to an increase in the catalyst stability.

В данной работе приводятся результаты исследований по влиянию второго темплата (технического углерода) на текстурные, кислотные и каталитические свойства Zn-алюмосиликатов структурного типа цеолита MFI в процессе превращения пропана в ароматические углеводороды. С помощью метода термопрограммированной десорбции аммиака установлено, что с ростом количества технического углерода, добавляемого в процессе синтеза цеолита, концентрация кислотных центров получаемого цеолита увеличивается. Показано, что добавление технического углерода в кристаллизационный гель в процессе синтеза цинкалюмосиликата приводит к повышению общего объема его пор в результате увеличения объема мезопор. Методом дифференциального термического анализа определено количество коксовых отложений, образующихся на поверхности цинкалюмосиликатов в ходе протекания реакции ароматизации пропана. Установлено, что оптимальное соотношение между числом активных центров катализатора и объемом образовавшихся мезопор достигается на цинкалюмосиликате, полученном на основе цеолита с добавкой на стадии его синтеза 1,0% технического углерода, что приводит к уменьшению скорости коксообразования и, соответственно, к повышению стабильности работы катализатора.

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Keywords

кислотность, ароматические углеводороды, zinc aluminosilicate, пропан, aromatic hydrocarbons, template, micro-mesoporous structure, Zn-алюмосиликаты, propane, мезопористые материалы, цинкалюмосиликат, микрои мезопористая структура, темплат, темплаты, acidity, микроструктуры

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
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