Journal
RESOURCES CONSERVATION AND RECYCLING
Volume 198, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.resconrec.2023.107154
Keywords
Plastic waste; Catalytic cracking; Hierarchical; ZSM-5; Naphtha
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Catalytic cracking of plastics into naphtha as a substitute for new plastic production has the potential to contribute to the plastic circular economy. By utilizing hierarchical ZSM-5 catalysts, a significant improvement (4.3 x to 12.3 x) in catalyst lifetime has been achieved compared to conventional analogues. Increasing the Bronsted acid concentration enhances catalyst lifetime and boosts cumulative aromatic selectivity, resulting in economic benefits and reduced environmental impact.
Catalytic cracking of plastics into naphtha as a substitute for new plastic production has the potential to contribute to the plastic circular economy. However, mitigating catalyst deactivation in large-scale processes poses a significant challenge. Here, we demonstrate a remarkable improvement (4.3 x to 12.3 x) in catalyst lifetime by utilizing hierarchical ZSM-5 catalysts compared to conventional analogues. Increasing the Bronsted acid concentration from 0 to 302 & mu;mol/g enhances catalyst lifetime by over 46 x and boosts cumulative aromatic selectivity from 6 to 73%. Catalyst characterization reveals the development of significant voids after modification, enhancing molecular transport within the hierarchical ZSM-5. Economic analysis shows a pilot system with a 10 ton/day capacity yielding an annual profit of $344,999 and an 11.5% return on investment. Life cycle assessment indicates a reduction of 817.6 kg CO2 eq compared to traditional plastic-to-fuels technology. These findings advance the plastic circular economy and bring us closer to commercial implementation.
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