Thermal Catalytic-Cracking Low-Density Polyethylene Waste by Metakaolin-Based Geopolymer NaA Microsphere

Metakaolin-based geopolymer microspheres (MGM) with hierarchical pore structures were prepared by suspension dispersion method in dimethicone at 80 °C. The hydrothermal modification of MGM was carried out at a lower temperature of 80 °C, and a NaA molecular sieve converted from metakaolin-based geop...

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Bibliographic Details
Published in:Molecules (Basel, Switzerland) Switzerland), 2022-04, Vol.27 (8), p.2557
Main Authors: Tang, Shanshan, He, Yan, Deng, Xingfa, Cui, Xuemin
Format: Article
Language:English
Subjects:
Catalysts
Catalytic cracking
Crystal structure
Diesel fuels
Energy consumption
fuel oil
Fuel oils
Gasoline
Geopolymers
Heat
Liquid phases
Low density polyethylenes
Metakaolin
Methods
Microspheres
Molecular sieves
NaA molecular sieve
Plastic pollution
plastic waste
Polyethylene
R&D
Reaction time
Reactors
Research & development
Selectivity
Structural hierarchy
Waste to energy
Zeolites
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Summary:Metakaolin-based geopolymer microspheres (MGM) with hierarchical pore structures were prepared by suspension dispersion method in dimethicone at 80 °C. The hydrothermal modification of MGM was carried out at a lower temperature of 80 °C, and a NaA molecular sieve converted from metakaolin-based geopolymer (NMGM) with good crystal structure was prepared and applied in thermal catalytic cracking of low-density polyethylene (LDPE) reaction. The one-pot two-stage thermal catalytic cracking of LDPE was carried out in a 100 mL micro-autoclave under normal pressure. In this work, the optimal proportions and optimal reaction conditions of catalysts for NMGM thermal catalytic cracking of LDPE waste to fuel oil were investigated. The NMGM catalyst showed high selectivity to the liquid product of thermal catalytic cracking of waste LDPE. Under the reaction conditions of reaction time of 1 h and reaction temperature of 400 °C, the liquid-phase yield of thermal catalytic cracking of LDPE reached a high of 88.45%, of which the content of gasoline components was 10.14% and the content of diesel components was 80.97%.
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules27082557