Abstract
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.
Highlights
Polyethylene terephthalate (PET) is one of the most widely used polymers in packaging, electronics, storage, and personal care products across the world
Du et al investigated ZSM-5 zeolite, CaO as catalysts in the pyrolysis of PET-based waste carpet at different temperatures and using different pyrolysis methods and analyzed the gas and liquid products by gas chromatography mass spectrometry (GC-MS). They studied different heating rates, thermal, and catalytic pyrolysis, with/without the co-feeding of steam and indicated that the conversion from PET to aromatic hydrocarbons was favored at higher temperatures and that slow heating rates can facilitate the production of benzene
It was reported that the selectivity of aromatic hydrocarbon can be influenced by the introduction of Driven by prior studies in PET or lignin pyrolysis, we found that most of the previous catalytic pyrolysis studies have focused on the effect of several parameters such as temperature, heating rate, different type of PET, and common catalysts on pyrolysis products and its distribution
Summary
Polyethylene terephthalate (PET) is one of the most widely used polymers in packaging, electronics, storage, and personal care products across the world. Du et al investigated ZSM-5 zeolite, CaO as catalysts in the pyrolysis of PET-based waste carpet at different temperatures and using different pyrolysis methods and analyzed the gas and liquid products by gas chromatography mass spectrometry (GC-MS) They studied different heating rates, thermal, and catalytic pyrolysis, with/without the co-feeding of steam and indicated that the conversion from PET to aromatic hydrocarbons was favored at higher temperatures and that slow heating rates can facilitate the production of benzene. Al-asadi et al pyrolyzed real PET-containing waste plastics in a horizontal tubular reactor with different Ni-loaded catalysts, including Ni/ZSM5, Ni/y-zeolite, Ni/beta-zeolite, and Ni/natural zeolite from 600 to 900 ◦ C They concluded that the highest yield of oil product was achieved in the presence of Ni/γ-zeolite and Ni/β-zeolite and oxygenates were significantly converted to non-oxygenated compounds in the oil products using Ni/ZSM-5 [16]. Based on the detailed structure information of pyrolytic products provided by 13 C nuclear magnetic resonance (NMR) analysis, the change of functional groups in the liquid products can be found before and after using the catalyst [27]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
