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The pyrolysis of poly (ethylene terephthalate) (PET) in the presence of ZSM-5 zeolite and NiCl2 as a catalyst was studied at different temperatures under N2 atmosphere. Quantitative 13C nuclear magnetic resonance (NMR) and Fourier transform infrared spectroscopy (FT-IR) were applied to characterize the waxy and solid residue. The carboxyl and aliphatic hydroxyl groups in the waxy residue have been greatly depleted after the use of zeolite during pyrolysis on the basis of the results of 13C NMR and FT-IR analysis. The proportion of aromatic hydroxyl groups increased by 21.82% when the mass ratio of zeolite to PET was set to 2.0/1.0. The results indicate that ZSM-5 is able to facilitate the decomposition of carboxyl, aliphatic groups, and ether bonds in the primary products produced from the pyrolysis of PET. In addition, the deoxygenation effects on the waxy products have been significantly enhanced with the addition of zeolite based on the results of NMR.
Hang Jia; Haoxi Ben; Ying Luo; Rui Wang. Catalytic Fast Pyrolysis of Poly (Ethylene Terephthalate) (PET) with Zeolite and Nickel Chloride. Polymers 2020, 12, 705 .
AMA StyleHang Jia, Haoxi Ben, Ying Luo, Rui Wang. Catalytic Fast Pyrolysis of Poly (Ethylene Terephthalate) (PET) with Zeolite and Nickel Chloride. Polymers. 2020; 12 (3):705.
Chicago/Turabian StyleHang Jia; Haoxi Ben; Ying Luo; Rui Wang. 2020. "Catalytic Fast Pyrolysis of Poly (Ethylene Terephthalate) (PET) with Zeolite and Nickel Chloride." Polymers 12, no. 3: 705.
Abundant studies have been completed about factors on the pyrolysis of coal and biomass. However, few articles laid emphasis on using CO2 as a carrier gas to explore the compositional changes of pyrolysis products in coal and biomass pyrolysis for industrial application and commercial value. The experiments on coal and biomass pyrolysis in N2 and CO2 using a horizontal tube furnace were conducted at 500 °C. The impact of introducing CO2 on the pyrolysis process of bituminous coal and Platanus sawdust was investigated. The nuclear magnetic resonance (NMR) spectra of tar and the characterizations of char including Brunner-Emmet-Teller (BET) measurements, scanning electron microscope (SEM), Fourier transform infrared (FT-IR) spectroscopy, and element analysis were studied. The findings in light of the experimental results show that introducing CO2 enhances the coal and biomass pyrolysis in a solid product by promoting the fracture of hydroxyl groups. It also promotes tar decomposition and the release of volatiles, which contribute to the occurrence of char with high porosity, pore volume, and specific surface. Furthermore, higher specific surface enhances the adsorption performance of char as active carbon. Simultaneously, CO2 promotes the increase of oxygen-containing aromatics especially the methoxy-containing aromatics, and the decrease of deoxygenated aromatic hydrocarbons in pyrolysis oils. In addition, the introduction of CO2 changes the amount of aliphatic compounds in various ways for the pyrolysis of coal and biomass. From a perspective of business, the changes in the composition of pyrolysis oil brought by CO2 may create new value for fuel utilization and industrial products.
Ying Luo; Haoxi Ben; Zhihong Wu; Kai Nie; Guangting Han; Wei Jiang. Impact of CO2 on Pyrolysis Products of Bituminous Coal and Platanus Sawdust. Polymers 2019, 11, 1370 .
AMA StyleYing Luo, Haoxi Ben, Zhihong Wu, Kai Nie, Guangting Han, Wei Jiang. Impact of CO2 on Pyrolysis Products of Bituminous Coal and Platanus Sawdust. Polymers. 2019; 11 (8):1370.
Chicago/Turabian StyleYing Luo; Haoxi Ben; Zhihong Wu; Kai Nie; Guangting Han; Wei Jiang. 2019. "Impact of CO2 on Pyrolysis Products of Bituminous Coal and Platanus Sawdust." Polymers 11, no. 8: 1370.