Hongcai Su,Yuheng Wu,Jie Pan,Lingjun Zhu,Shurong Wang,Yanjun Hu
Mixed plastic wastes are posing substantial challenges to the environment due to their mass production and difficulty in separation, especially mixed polyvinyl chloride/polyethylene terephthalate (PVC/PET) plastic wastes. In this work, a novel tandem thermochemical process including hydrothermal depolymerization of mixed PVC/PET plastic wastes, and subsequent catalytic aqueous phase reforming (APR) of hydrolysate solution was developed. The activated carbon derived from PVC (PVC-AC) supported Ru catalysts were prepared and successfully used in the catalytic APR of hydrolysate solution for high-purity H 2 production. Besides, the presence of NaOH realized in-situ capture of CO 2 in APR process, which promoted the water-gas shift reaction and inhibited methanation reactions. As a result, a high H 2 yield of 12.23 mol/kg Plastic with H 2 concentration of ca. 98% was obtained via tandem hydrothermal conversion of mixed PVC/PET plastic wastes. The by-products from the entire tandem process including the terephthalic acid (TPA) and sodium chloride (NaCl) were separated and purified for further industrial application. This work provided a sustainable route for conversion of mixed plastic wastes into value-added fuel.
Yiyun Zhang,Jianchun Jiang,Jiang Wu,Mengyuan Wen,Jia Wang
Chemical upcycling of waste polycarbonate (PC) into jet fuels through catalytic tandem hydropyrolysis/hydrodeoxygenation (THH) is a practical strategy to generate value from polymer wastes. A process which combining hydropyrolysis with vapor phase hydrodeoxygenation (HDO) was proposed in a two-stage pressurized fixed-bed reactor. A cobalt-based Metal-Organic Framework (MOF) derived material supported with nickel was designed for the vapor-phase HDO of phenolic compounds derived from PC hydropyrolysis. The product distribution could be regulated by optimizing reaction pressure in the reactor and catalyst to PC mass ratio. Experimental results showed that the products are all phenolic compounds in the absence of catalysts, while a high yield of jet-fuel range cycloalkanes (100%) was obtained under optimized conditions (7 bar H 2 pressure and 5:1 catalyst to PC mass ratio) over NiCo/C. The high HDO activity of NiCo/C depends on the synergistic effect of nickel and cobalt atoms, which facilitates the elimination of phenolic hydroxyl group and hydrogenation of benzene ring . This work puts forward an efficient approach for upcycling PC waste into jet fuels with MOF-derived NiCo/C as a catalyst.
危险品化学品经营许可证（带存储）