Sustainable aviation fuel (SAF) is a promising solution for reducing aviation-related carbon emissions. However, conventional SAF production methods such as waste oil aromatization face challenges like complex processing requirements and the generation of unwanted polycyclic aromatic hydrocarbons (PAHs). This study presents a novel, aromatization-free approach to SAF production by co-upcycling waste oils and polystyrene (PS) plastics. The inherent aromatic ring structures in PS plastics are utilized to directly form aromatic hydrocarbons, bypassing the need for traditional aromatization. A two-stage pressurized fixed-bed reactor was employed, where waste oils and PS underwent co-hydropyrolysis to generate intermediates, followed by gas-phase catalytic hydrogenation. Under optimized conditions (0.15 MPa H 2 , 480 °C for co-hydropyrolysis, 350 °C for hydrogenation, and 5 mg Pd/SBA-15 catalyst), this process yielded 71.0 wt% C 8 -C 16 jet fuel components, with 84.5 % selectivity. In comparison, catalysts with higher acidity, such as Pd/HZSM-5 and Pd/USY, promoted side reactions like cracking, leading to lower liquid yields (35.7 wt% and 18.1 wt%, respectively) and a more complex product mixture. Additionally, Pd/SBA-15 catalyst demonstrated excellent stability, maintaining consistent catalytic performance over 10 repeated cycles, and showed potential for scalability with a variety of waste plastics and oils. The study underscores the feasibility of co-upcycling waste oils and PS plastics, offering an efficient, sustainable pathway to streamline SAF production while reducing the environmental impacts associated with conventional methods.
Co-upcycling of mixed plastics offers a viable approach to reusing carbon resources in plastic wastes and realizing circular economy. However, the presence of polyvinyl chloride (PVC) often complicates the co-upcycling processes, because chlorine (Cl) released from PVC can deactivate catalysts and enter final products. Moreover, existing plastic upcycling processes usually require harsh reaction conditions. Here we present a strategy enabling efficient co-upcycling of PVC and polypropylene (PP) at mild conditions. We use chlorine-resistant ionic liquids butylpyridinium chloride-aluminium chloride to dechlorinate PVC and simultaneously depolymerize the PP–PVC mixture into Cl-free liquid hydrocarbons, with the co-production of hydrogen chloride (HCl) as byproduct. This conversion approach operates at room temperature without the use of external hydrogen or noble metal catalysts. The Cl-free liquid hydrocarbon yield is up to 97.4 wt% of C and H in the feed PP–PVC mixture. This work can incentivize further technical development in plastic upcycling and improve the sustainability of plastic waste management.
Chuanchuan Zhao,Xuehui Liu,Xinhao Chang,Shimei Xu,Yu-Zhong Wang
The high-value recycling of waste wind turbine blades not only mitigates environmental pollution but also advances resource circularity, but the current recycling approaches predominantly focus on the segregated recovery of degraded products and fibers, in which a fundamental challenge lies in reconciling high-quality fiber recovery with value-added utilization of degraded products. Furthermore, the practical application of the recycled fibers is constrained by size and structure limitations. Herein, we developed an innovative strategy for synergistic co-upcycling of fiber and degraded products through one-pot catalytic oxidation approach. Under the joint action of oxygen and only 4 wt% vanadium catalyst, the C O bond in epoxy resin (EP) is selectively cleaved to yield hydroxyl-rich degraded products (DEP), the fibers are simultaneously oxidized and modified. By integrating DEP and modified fibers in situ, a strong and tough adhesive (DEP-RGF) is obtained, its adhesion strength and fracture displacement on wood are 5.30 MPa and 1.44 mm, respectively, both parameters doubling those of pure DEP. Notably, the adhesive performances of DEP-RGF are better than that of the composite fabricated by mixing DEP with original fibers. Furthermore, DEP-RGF also exhibits strong adhesion to diverse substrates such as metal, plastics and glass, achieving a maximum adhesion strength of 10.86 MPa. This simple and efficient recycling method not only offers a viable solution for the sustainability of wind energy technologies, but also provides valuable insights into the upcycling of other types of mixed plastics.
危险品化学品经营许可证（带存储）