Zeolite shape selectivity impact on LDPE and PP catalytic pyrolysis products and coke nature

Abstract

Catalytic pyrolysis of plastic waste can offer an economical process for plastic waste conversion due to the capability to produce high-quality products with high yields. A simple stirred tank reactor...

Catalytic co-pyrolysis of LDPE and PET with HZSM-5, H-beta, and HY: experiments and kinetic modelling

“…It is known that H-beta and HY both undergo significantly higher deactivation during the catalytic pyrolysis of LDPE when compared to HZSM-5. 20,47 This trend is also observed in our study as the solid residual, resemblant of catalytic coke, is higher for H-beta and HY. The conversion for LDPE/H-beta (93.8%) is similar to that reported by Pyra et al (97.5%) where the authors used a 1 : 3 catalyst to feedstock ratio and 5 °C min −1 heating rate during thermogravimetric analysis.…”

Design of trifunctional catalysts for promoting sequential condensation, deoxygenation, and aromatization of pyrolyzed mixed waste

“…64,65 Indeed, in the absence of biomass, the commercial ZSM-5 zeolite (ZSM-comm) efficiently converts PE into gas and oil products. 66 Concerning the quality of the oil (Fig. 8), 67.5% appears in the form of aromatic hydrocarbons and 7.6% as alkanes and alkenes, making the total oxygenates in this sample only 25%.…”

Pyrolysis analysis of polyethylene terephthalate: effects of carrier gases (N2, He, and Ar) and zeolite catalyst (A4) on yield

“…A decline in such vibrations implied the conversion of aromatic compounds into aliphatic ones. The carrier gas influenced the aromatic compounds of the char in this wavenumber range 18,23 …”

“…22 Hydrogen substantially rose in the presence of the catalyst, and the C H bond mainly formed through cracking dehydrogenation, which is desirable in the presence of a catalyst. 23 Hence, the water gas shift reaction probably contributed to the formation of CO. For example, the maximum H 2 in the presence of the catalyst was obtained in the N 2 medium, whereas the maximum H 2 in the absence of the catalyst was observed in the He medium. 19,20,24 Furthermore, the catalyst increased hydrocarbon gases, suggesting increased cracking and reforming reactions.…”

“…The carrier gas influenced the aromatic compounds of the char in this wavenumber range. 18,23 XRD analysis of the char Figure 5 plots the XRD patterns of the char samples. A broad peak appeared at 10-30°due to aromatic compounds in the form of carbon sheets regularly positioned on each other.…”