EFFECT OF CARBON CHAIN LENGTH AND SHAPE OF HYDROCARBONS MOLECULES ON CATALYTIC CRACKING AND AROMATIZATION OVER HZSM-5 CATALYSTS DURING CATALYTIC PYROLYSIS OF POLYOLEFINS

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27710%2F23%3A10252453" target="_blank" >RIV/61989100:27710/23:10252453 - isvavai.cz</a>

Result on the web

<a href="https://www.icct.cz/cs/Amca-ICCT/media/content/2023/dokumenty/ICCT2023-Book_of_abstracts.pdf" target="_blank" >https://www.icct.cz/cs/Amca-ICCT/media/content/2023/dokumenty/ICCT2023-Book_of_abstracts.pdf</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

EFFECT OF CARBON CHAIN LENGTH AND SHAPE OF HYDROCARBONS MOLECULES ON CATALYTIC CRACKING AND AROMATIZATION OVER HZSM-5 CATALYSTS DURING CATALYTIC PYROLYSIS OF POLYOLEFINS

Original language description

Presentation at ICCT2023. The catalytic dehydroaromatization of alkanes to aromatics [1] have attracted considerable attention of chemical industry, because it can be used for the upgrading of low-cost alkanes into high added-value aromatics, such as benzene, toluene, and xylene (BTX). The same process occurs during thermo-catalytic pyrolysis of plastics, especially in polyolefin treatment, where polymer chains are cracked producing aliphatic hydrocarbons which then undergo olefination and dehydroaromatization. The aromatic yield and selectivity in thermo-catalytic treatment of waste polyolefins can be improved by optimizing the catalyst properties as well as the process parameters. For this purpose, it is important to gain an enhanced understanding of the dehydroaromatization of individual hydrocarbons that result from initial cracking of polymer chains.In our recent work we have reported thermo-catalytic pyrolysis of virgin polyolefins over HZSM-5 zeolite catalysts investigating the influence of catalyst acidity, operation mode and process parameters on the production and selectivity of aromatics [2,3]. The present work is a follow-up study aiming at investigating the influence of different carbon chain length and shape of individual hydrocarbons on the product distribution in catalytic cracking and dehydroaromatization process. It was shown that the size and type of hydrocarbon chains strongly influence the conversion as well as aromatic selectivity. This is directly dependent on the ease of diffusion of the individual molecules through zeolitic pores when reaching the active centers. Moreover, since branched chain hydrocarbon (main cracking products of PP pyrolysis) have restricted diffusion in micro pores of zeolite catalysts, zeolites with hierarchical porosity (e.g. micro-meso and micro-macro) can be interesting catalytic materials for their processing.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

20400 - Chemical engineering

Project

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Continuities

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Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů