Yu Hongchang, Li Fuwei, He Wen, Song Caifeng, Zhang Yansong, Li Zhixia, Lin Hongfei
School of Chemistry and Chemical Engineering, Guangxi University Nanning 530004 China
Guangxi Bossco Environmental Protection Technology Co., Ltd. Nanning 530007 China.
RSC Adv. 2020 Jun 9;10(37):22126-22136. doi: 10.1039/d0ra03082a. eCollection 2020 Jun 8.
Micro-mesoporous ZSM-5 with different Si/Al ratios (MZ-, = 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 ) 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.
通过在沸石水热合成过程中添加微晶纤维素（MCC）作为共模板，合成了具有不同硅铝比（MZ-，硅铝比 = 27、80、150）的微介孔ZSM-5。所得的ZSM-5用于高密度聚乙烯（HDPE）和聚丙烯的催化裂化。发现引入MCC显著增强了介孔和强酸位点的形成。MZ-27的油产率最高：HDPE为21.5%，聚丙烯为32.1%，其中轻质芳烃（BTEX）选择性分别为87.6%和79.7%。HZ-150（不含MCC的ZSM-5，硅铝比 = 150）的气体产率最高：HDPE为85.4%，聚丙烯为76.7%，其中轻质烯烃（C）选择性分别为44%和48.3%。MZ-27致密的酸性位点和介孔结构使其在生产芳烃产品方面具有更好的活性。HZ-150适度的酸度和微孔结构有助于从聚烯烃塑料的催化裂化中生产轻质烯烃。
