Influence of process conditions on the formation of 2–4 ring polycyclic aromatic hydrocarbons from the pyrolysis of polyvinyl chloride

Zhou, Hui; Wu, Chunfei; Onwudili, Jude A.; Meng, Aihong; Zhang, Yanguo; Williams, Paul T.

doi:10.1016/j.fuproc.2016.01.013

Cited by 60 publications

(8 citation statements)

References 33 publications

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“…In this way, one of the most recent studies was carried out by 59 Zhou et al(2016) to evaluate the effect of temperature and heating rate on 2-4 ring polycyclic 60 aromatic hydrocarbons (PAHs), gases and HCl formation during the pyrolysis of polyvinyl 61 chloride (PVC) in a laboratory fixed bed reactor. From the results, they concluded that the increase 62 of temperature produced a rise in gases and PAHs yield and a decrease in the HCl formation.…”

Section: Non-viscoelastic Polyurethane Foam 56mentioning

confidence: 99%

Pollutant emissions from the pyrolysis and combustion of viscoelastic memory foam

Garrido

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2017

Science of The Total Environment

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9Thermal degradation of viscoelastic memory foam (VMF) in a horizontal laboratory scale 10 reactor has been studied. Pyrolysis and combustion experiments under sub-stoichiometric 11 conditions were performed at four different temperatures (550ºC, 650ºC, 750ºC and 850ºC) for 12 the determination of pollutants. Analyses of gas and semivolatile compounds, including 13 polychlorodibenzo-p-dioxins and furans (PCDD/Fs) and dioxin-like polychlorobiphenyls (dl-14 PCBs) are shown. From the results, it was deduced that pyrolytic conditions favour the formation 15 of PAHs, methane, ethylene, NH 3 and dl-PCBs, whereas the presence of oxygen involves a higher 16 emission of PCDD/Fs and simple N-containing compounds such as NO and HCN. The toxic 17 levels calculated for PAHs, PCDD/Fs and dl-PCBs in all cases were low confirming that the 18 incineration of VMF mattress waste could be a good option for waste management. Nevertheless, 19

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Section: Non-viscoelastic Polyurethane Foam 56mentioning

confidence: 99%

Pollutant emissions from the pyrolysis and combustion of viscoelastic memory foam

Garrido

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Conesa

2017

Science of The Total Environment

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“…The variation of PAHs concentration in WTPO depended on the rubber components used for tire manufacture and the pyrolysis condition 24,51‐52 . Zhou et al 52 reported that the amount of PAHs formation during pyrolysis of polyvinyl chloride was influenced by the heating rate. The slow pyrolysis performed using a low heating rate (10°C/min) generated the total 2 to 4 ring PAHs content ca.…”

Section: Resultsmentioning

confidence: 99%

Production of cleaner waste tire pyrolysis oil by removal of polycyclic aromatic hydrocarbons via hydrogenation over Ni‐based catalysts

Kingputtapong

Chanlek

Poo‐arporn

et al. 2022

Intl J of Energy Research

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Summary This research aimed to improve the quality of waste tire pyrolysis oil (WTPO) via hydrogenation to eliminate polycyclic aromatic hydrocarbons (PAHs), which are classified as toxic compounds or precursors to induce the formation of particulate matter. Given the presence of organosulfurous compounds in WTPO, this research was consisted of two steps. First, the hydrogenation of naphthalene, a model PAH compound, was used to screen for suitable promoters [molybdenum (Mo), tungstate (W), and platinum (Pt)] for nickel‐supported gamma‐alumina (Ni/γ‐Al2O3) catalyst to provide a high sulfur tolerance and high PAH hydrogenation efficiency. Second, the obtained suitable catalysts were applied for the hydrogenation of 50 wt% WTPO solution in decane containing 15 982 ppm PAHs and a 0.75 wt% sulfur content. Although the NiPt/γ‐Al2O3 catalyst exhibited the highest performance with 83.8% naphthalene conversion under 40 bar initial H2 pressure at 350°C for 6 hours, it was less tolerant to the presence of thiophene, one of the organosulfurous compounds found in WTPO. Thus, the NiMo/γ‐Al2O3 and NiW/γ‐Al2O3 catalysts were selected for WTPO hydrogenation. The PAHs hydrogenation and hydrodesulfurization occurred simultaneously in both catalytic systems. Under 50 bar initial H2 pressure at 350°C, the NiMo/γ‐Al2O3 catalyst had a higher ability for hydrodesulfurization (98.4% maximum sulfur removal) than hydrogenation of PAHs (66.0% removal of PAHs), whereas NiW/γ‐Al2O3, with lower acidity, showed a preference for hydrogenation of PAHs (71.1% removal of PAHs) with a lower hydroisomerization efficiency (74.2% sulfur removal). Moreover, the chemical structure of PAHs affected the ability to be eliminated by hydrogenation. PAHs having unsubstituted rings could be easily hydrogenated, while the removal of PAHs containing alkyl substituents in both aromatic rings required severe reaction conditions due to their high steric hindrance for adsorption onto the catalyst active sites.

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“…PAHs and dioxins are formed in significantly lesser amounts under these conditions (Hu et al, 2019;Zhou et al, 2016). Furthermore, avoiding the use of certain feedstocks such as chlorine containing plastics, or copper containing materials can reduce the amounts of dioxins produced by the incomplete dehydrochlorination and de novo synthesis pathways respectively (Huang and Buekens, 1995;Zhou et al, 2016). PAHs can also be reduced through avoiding the use of certain feedstocks, mainly plastics (L. Zhou et al, 2015).…”

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

Removal of methylene blue from aqueous solutions by biochar prepared from the pyrolysis of mixed municipal discarded material

Hoslett

Ghazal

Mohamad

et al. 2020

Science of The Total Environment

137

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Influence of process conditions on the formation of 2–4 ring polycyclic aromatic hydrocarbons from the pyrolysis of polyvinyl chloride

Cited by 60 publications

References 33 publications

Pollutant emissions from the pyrolysis and combustion of viscoelastic memory foam

Pollutant emissions from the pyrolysis and combustion of viscoelastic memory foam

Production of cleaner waste tire pyrolysis oil by removal of polycyclic aromatic hydrocarbons via hydrogenation over Ni‐based catalysts

Removal of methylene blue from aqueous solutions by biochar prepared from the pyrolysis of mixed municipal discarded material

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