| Title |
3D-printed monolithic ZSM-5@nano-ZSM-5: Hierarchical core-shell structured catalysts for enhanced cracking of polyethylene-derived pyrolysis oils |
| ID_Doc |
13667 |
| Authors |
Wang, RY; Gong, YX; Wang, P; Zheng, AG; Wang, ZQ; Sha, YC; Jiang, QQ; Xin, MD; Cao, DX; Song, HT; Lin, W |
| Title |
3D-printed monolithic ZSM-5@nano-ZSM-5: Hierarchical core-shell structured catalysts for enhanced cracking of polyethylene-derived pyrolysis oils |
| Year |
2024 |
| Published |
|
| DOI |
10.1016/j.addma.2023.103890 |
| Abstract |
The catalytic upgrading of polyethylene-derived pyrolysis oils using ZSM-5 zeolites enables the cost-effective production of valuable chemicals from plastic waste, fostering a circular economy through resource recycling. To achieve high-performance catalyst design, balancing active site accessibility and selectivity is crucial. Here, we report a monolithic ZSM-5 @nano-ZSM-5 core-shell catalyst (mZ@nZ) fabricated via vat photo-polymerization, in situ crystal engineering, and a one-step desilication-recrystallization treatment. The micro -morphologies and microstructures of the core-shell catalysts are investigated using electron microscopies and physical adsorption methods. The mZ@nZ catalyst features a self-supporting face-centered cubic macrostructure with a layer of compositionally heterogeneous ZSM-5 zeolites, which comprises a catalytically benign nano-ZSM-5 shell (Si-rich) and a catalytically active ZSM-5 core (Al-rich). Abundant mesopores are created in mZ@nZ through desilication and zeolite agglomeration processes. This design offers three significant advantages: (1) enhanced active site accessibility via in situ zeolite growth, (2) surface passivation using a Si-rich shell to minimize side reactions, and (3) improved diffusion facilitated by the hierarchical structure, reducing light olefin secondary reactions and coke formation. Compared to pristine monolithic ZSM-5 and a reference pelletized catalyst, the mZ@nZ catalyst demonstrates superior performance in terms of higher light olefin yields and se-lectivities, with enhanced resistance to coking in the model compound and real LDPE pyrolysis oil cracking reactions. This research showcases a rational design approach at both macroscopic and microscopic scales, of-fering valuable insights for advancing polyolefin waste upgrading and novel zeolite catalyst design. |
| Author Keywords |
3D printing; ZSM-5; Monolith; Core-shell catalyst; LDPE pyrolysis oil |
| Index Keywords |
Index Keywords |
| Document Type |
Other |
| Open Access |
Open Access |
| Source |
Science Citation Index Expanded (SCI-EXPANDED) |
| EID |
WOS:001128254300001 |
| WoS Category |
Engineering, Manufacturing; Materials Science, Multidisciplinary |
| Research Area |
Engineering; Materials Science |
| PDF |
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