Synthesis of micro-mesoporous ZSM-5 zeolite with microcrystalline cellulose as co-template and catalytic cracking of polyolefin plastics

Micro-mesoporous ZSM-5 with different Si/Al ratios (MZ- X , X = 27, 80, 150) were synthesized by adding microcrystalline cellulose (MCC) as co-template into the hydrothermal synthesis process of zeolites. The resultant ZSM-5 were used for catalytic cracking of high density polyethylene (HPDE) and po...

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Veröffentlicht in:RSC advances 2020-06, Vol.1 (37), p.22126-22136
Hauptverfasser: Yu, Hongchang, Li, Fuwei, He, Wen, Song, Caifeng, Zhang, Yansong, Li, Zhixia, Lin, Hongfei
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Sprache:eng
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Zusammenfassung:Micro-mesoporous ZSM-5 with different Si/Al ratios (MZ- X , X = 27, 80, 150) were synthesized by adding microcrystalline cellulose (MCC) as co-template into the hydrothermal synthesis process of zeolites. The resultant ZSM-5 were used for catalytic cracking of high density polyethylene (HPDE) and polypropylene. It was found that introduction of MCC significantly enhanced the formation of mesopores and strong acid sites. MZ-27 achieved the highest oil yield: 21.5% for HPDE and 32.1% for polypropylene, and the light aromatics (BTEX) selectivity therein were 87.6% and 79.7%, respectively. HZ-150 (MCC-free ZSM-5, Si/Al = 150) achieved the highest gas yield: 85.4% for HDPE and 76.7% for polypropylene, and the light olefins (C &z.dbd; 2-4 ) selectivity therein were 44% and 48.3%, respectively. The dense acidic sites and mesoporous structure of MZ-27 were responsible for its better activity for producing aromatic products. The moderate acidity and microporous structure of HZ-150 were helpful for producing light olefins from catalytic cracking of polyolefin plastics. Microcrystalline cellulose as co-template enhances the formation of mesopores and strong acid sites in ZSM-5 zeolites.
ISSN:2046-2069
2046-2069
DOI:10.1039/d0ra03082a