Chemical Engineering Journal, Год журнала: 2024, Номер 486, С. 150332 - 150332
Опубликована: Март 11, 2024
Язык: Английский
Polymer Degradation and Stability, Год журнала: 2024, Номер 222, С. 110712 - 110712
Опубликована: Фев. 22, 2024
Язык: Английский
Процитировано
14
Angewandte Chemie, Год журнала: 2024, Номер 136(8)
Опубликована: Янв. 6, 2024
Abstract Hydrocracking catalysis is a key route to plastic waste upgrading, but the acid site‐driven C−C cleavage step relatively sluggish in conventional bifunctional catalysts, dramatically effecting overall efficiency. We demonstrate here facile and efficient way boost reactivity of sites by introducing Ce promoters into Pt/HY thus achieving better metal‐acid balance. Remarkably, 100 % low‐density polyethylene (LDPE) can be converted with 80.9 selectivity liquid fuels over obtained Pt/5Ce‐HY catalysts at 300 °C 2 h. For comparison, only gives 38.8 LDPE conversion 21.3 fuels. Through multiple experimental studies on structure‐performance relationship, species occupied supercage are identified as actual active sites, which possess remarkably‐improved adsorption capability towards short‐chain intermediates.
Язык: Английский
Процитировано
13
Nano Research, Год журнала: 2024, Номер 17(6), С. 5645 - 5650
Опубликована: Март 7, 2024
Язык: Английский
Процитировано
12
ACS Sustainable Chemistry & Engineering, Год журнала: 2024, Номер 12(15), С. 6013 - 6022
Опубликована: Апрель 3, 2024
Conventional metal-zeolite catalysts struggle with hydrocracking polyolefin wastes due to a significant mismatch between the size of large polymer molecules and micropores zeolites. This severely constrains diffusion site accessibility, resulting in low efficiency. Here, we unveil simple hydrothermal treatment commercial Y zeolite that creates hierarchical (Y–H), which possesses substantial layers mesoporous nanoflakes on its surface, constructing unique pore architecture. network integrates (ca. 13 nm) medium 4 mesopores original (<1 critically without altering zeolite's topology, crystallinity, or acidity. Compared Pt/Al2O3, Y–H Pt/Al2O3 exhibit remarkable 4-fold increase activity, is attributed enhanced accessibility acid sites, providing sufficient cascade cracking space for macromolecular polyolefins be efficiently converted into small, branched alkanes. Notably, catalyst achieves an impressive 96.8% PE conversion 90.8% selectivity toward value-added gasoline diesel fuels (C5–20) within h at 280 °C. work not only demonstrates pivotal role networks but also highlights their broader applicability plastic waste upcycling.
Язык: Английский
Процитировано
12
Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(17)
Опубликована: Март 4, 2024
Abstract Transforming polyolefin waste into liquid alkanes through tandem cracking‐alkylation reactions catalyzed by Lewis‐acid chlorides offers an efficient route for single‐step plastic upcycling. Lewis acids in dichloromethane establish a polar environment that stabilizes carbenium ion intermediates and catalyzes hydride transfer, enabling breaking of polyethylene C−C bonds forming alkylation. Here, we show selective deconstruction low‐density (LDPE) to is achieved with anhydrous aluminum chloride (AlCl 3 ) gallium (GaCl ). Already at 60 °C, complete LDPE conversion was achieved, while maintaining the selectivity gasoline‐range over 70 %. AlCl showed exceptional rate 5000 , surpassing other acid catalysts two orders magnitude. Through kinetic mechanistic studies, rates do not correlate directly intrinsic strength or steric constraints may limit polymer access sites. Instead, processes cracking alkylation are primarily governed initiation ions subsequent intermolecular transfer. Both jointly control relative alkylation, thereby determining overall selectivity.
Язык: Английский
Процитировано
11
Nano Research, Год журнала: 2024, Номер unknown
Опубликована: Сен. 9, 2024
Язык: Английский
Процитировано
11
Nature Communications, Год журнала: 2024, Номер 15(1)
Опубликована: Ноя. 29, 2024
The surge in global plastic production, reaching 400.3 million tons 2022, has exacerbated environmental pollution, with only 11% of being recycled. Catalytic recycling, particularly through hydrogenolysis and hydrocracking, offers a promising avenue for upcycling polyolefin plastic, comprising 55% waste. This study investigates the influence water on depolymerization using Ru catalysts, revealing promotional effect when both metal acid sites, Brønsted site, are present. Findings highlight impact content, metal-acid balance, their proximity this interaction, as well role modulating isomerization process, affecting product selectivity. Additionally, interaction facilitates suppression coke formation, ultimately enhancing catalyst stability. A comprehensive techno-economic life cycle assessment underscores viability benefits presence water. These insights advance understanding offer strategies optimizing recycling processes. hydrocracking present approach plastics. Here, authors catalytic upcycling, emphasizing that catalysts an optimal balance significantly improve polyethylene is
Язык: Английский
Процитировано
11
Results in Engineering, Год журнала: 2025, Номер unknown, С. 103958 - 103958
Опубликована: Янв. 1, 2025
Язык: Английский
Процитировано
2
Nano Letters, Год журнала: 2025, Номер unknown
Опубликована: Фев. 13, 2025
Ruthenium (Ru)-based catalysts are active in catalyzing polyethylene (PE) upcycling, but their tendency for methanation devalues the process. Although previous works confirmed that regulation of Ru structure can inhibit methane yields, mechanism is still unclear, and catalytic performance remains higher upside potential. Herein, we synthesized M-Ru/H-ZSM-5 (M = Pt, Pd, Rh) PE upcycling. Pt-Ru/H-ZSM-5 had better conversion (84.36%) liquid fuel selectivity (78.38%) extremely low (8.43%), which be ascribed to its more electron-deficient Ruδ+ species synergistic effect induced by Pt doping. Through density functional theory calculations, nature inhibition was uncovered reaction pathway proposed. Furthermore, catalyst demonstrated stability reusability, as well efficacy upcycling various PEs. This work reveals Ru-based reactions, promoting plastic recycling development.
Язык: Английский
Процитировано
2
Nature Chemical Engineering, Год журнала: 2025, Номер unknown
Опубликована: Фев. 26, 2025
Язык: Английский
Процитировано
2