Employing CO2 as reaction medium for in-situ suppression of the formation of benzene derivatives and polycyclic aromatic hydrocarbons during pyrolysis of simulated municipal solid waste

Lee, Jechan; Choi, Dongho; Tsang, Yiu Fai; Oh, Jeong-Ik; Kwon, Eilhann E.

doi:10.1016/j.envpol.2017.02.028

Cited by 41 publications

(8 citation statements)

References 38 publications

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“…18 It has also been discussed how adding CO 2 during the pyrolysis stage lowers the release of benzene derivatives and polycyclic aromatic hydrocarbons (PAHs) by hindering aromatization, cyclization, polymerization, and secondary char-formation reactions. 19 Finally, it was reported that the addition of CO 2 during pyrolysis and gasification influenced the final gas yield through homogeneous gaseous reactions such as the reverse water gas shift reaction. 16 The commonly reported higher 16,20,21 This relationship has been described as advantageous, as CO 2 could be used as a moderator or in situ control to tune the H 2 /CO ratio of the syngas for the intended application.…”

Section: Introductionmentioning

confidence: 99%

“…Biomass gasification and the effects on the final char yield have been discussed at length, with many describing the lower final char mass due to char gasification via the Boudouard reaction. − It has been reported that CO 2 gasification can promote tar cracking reactions such as the dry reforming of tars, small hydrocarbons, and methane . It has also been discussed how adding CO 2 during the pyrolysis stage lowers the release of benzene derivatives and polycyclic aromatic hydrocarbons (PAHs) by hindering aromatization, cyclization, polymerization, and secondary char-formation reactions . Finally, it was reported that the addition of CO 2 during pyrolysis and gasification influenced the final gas yield through homogeneous gaseous reactions such as the reverse water gas shift reaction .…”

Section: Introductionmentioning

confidence: 99%

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Syngas Quality Enhancement by CO₂ Injection during the Co-Gasification of Biomass and Plastic

Cullen

Kang

Klinghoffer

2023

Ind. Eng. Chem. Res.

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Gasification technologies have been considered to be viable waste enhancement avenues for diverting mixed nonrecycled plastic-containing waste from landfills. The main objective of this work was to investigate CO2 utilization with the air gasification of mixed plastics and biomass. High-density polyethylene (HDPE) was co-gasified with Douglas fir, air, and CO2 in a semibatch updraft gasifier with supporting thermogravimetric analyzer (TGA) testing. Possible reaction mechanisms of the mixed feedstock with CO2 injections were discussed by comparing the gas, tar, and char products of the gasifier with the TGA data. Injecting 10 and 20 vol % CO2 in air gasification with an air to fuel ratio of 0.3 improved carbon conversion from the tar to the gas phase by 28 and 43 carbon weight %, respectively. CO2 addition was an effective moderator of the H2/CO ratio, beneficial to tar reduction and enhanced the energy density of the syngas, improving the tunability of the gasification process.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Syngas Quality Enhancement by CO₂ Injection during the Co-Gasification of Biomass and Plastic

Cullen

Kang

Klinghoffer

2023

Ind. Eng. Chem. Res.

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“…The radical reaction between benzenes forms biphenyl with radical. Benzene reacting with biphenyl leads to terphenyl that is converted into phenanthrene via a series of acetylene addition and dehydrogenation reactions 31 . Dehydrogenation and reaction between benzene and benzoic acid/radical produces biphenyl‐2‐carboxylic acid that can be further isomerized to biphenyl‐4‐carboxylic acid.…”

Section: Resultsmentioning

confidence: 99%

“…Benzene reacting with biphenyl leads to terphenyl that is converted into phenanthrene via a series acetylene addition and dehydrogenation reactions. 31 Dehydrogenation and reaction between benzene and benzoic acid/ radical produces biphenyl-2-carboxylic acid that can be further isomerized to biphenyl-4-carboxylic acid. 9H-fluoren-9-one was formed from biphenyl-2-carboxylic acid as it underwent thermally-induced condensation.…”

Section: Pyrolysis Of Banner Waste Without Catalystmentioning

confidence: 99%

Energy recovery from banner waste through catalytic pyrolysis over cobalt oxide: Effects of catalyst configuration

Park

Lin

Kwon

et al. 2022

Intl J of Energy Research

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Summary Banner waste contributes to a tremendous amount of plastic waste, which requires a proper treatment method. As catalytic pyrolysis is an effective plastic treatment method, this study explored the effects of Co3O4 catalyst configuration on the characteristics and energy contents of pyrolytic products of banner waste. In situ configuration (feedstock and catalyst in direct contact) provided intimate contact of pyrolysis vapors with the catalyst, which enhanced thermal cracking of the feedstock and its pyrolyzates. This resulted in higher yields of gas and liquid pyrolyzates and a lower yield of solid residue, compared with ex situ configuration (feedstock and catalyst not in direct contact). The Co3O4 catalyst promoted decarboxylation and suppressed decarbonylation. In comparison with in situ configuration, ex situ configuration further enhanced the effects of promoting decarboxylation and suppressing decarbonylation. Wax species (ie, heavy molecules of C>20) were only found in in situ configuration, most likely because, in ex situ configuration, the heavy carbon molecules form coke deposited on the catalyst. Non‐catalytic pyrolysis led to pyrolytic gas with a heating value (14.4 MJ kg−1) that was higher than pyrolytic gases produced in either in situ or ex situ configuration. Using in situ configuration, increased the heating value of pyrolytic liquid (35.4 MJ kg−1) and char (21.3 MJ kg−1), in comparison with using ex situ configuration. This is the first study that examines the impact of catalyst configuration on pyrolysis of banner waste.

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“…However, in practice (2.11) are limited by the number of carbon atoms in the particle. The system of equations (2.11) must be supplemented with the equations of heat and mass transfer and the chemical kinetics of the fuel burnout process [23,24].…”

Section: Calculated Model Of Soot Formationmentioning

confidence: 99%

Formation of soot in the disposal of municipal solid waste

Барышева

Mokhova

2021

E3S Web Conf.

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In power plants intended for the disposal of solid household waste, the processes take place at a high temperature. For such installations, nonequilibrium processes are characteristic of a change in the composition of combustion products caused by the final rates of the ongoing chemical reactions. This affects the basic characteristics of the combustion process of municipal solid waste. A mathematical model has been created for calculating the chemically nonequilibrium composition of the fuel. Solid household and industrial waste is a high-energy fuel. It is a high energy fuel. The process of thermal neutralization of solid household waste is considered. An alternative calculation method is presented that allows one to find the composition of combustion products under conditions of nonequilibrium in the process of thermal utilization of solid domestic waste. The data on the composition and properties of solid household waste obtained by the developed method of calculation allow predicting the yield of super Eco toxicants in combustion products. On the basis of the equations of formal chemical kinetics, an alternative was created, which consists in determining the composition of combustion products taking into account the kinetics of chemical reactions. The assumption is introduced that transformations in the gas phase are elementary, one-stage. Various chemical interactions can be represented by a set of elementary stages. The most probable are mono-, biand three molecular chemical reactions. The method allows predicting the yield of Eco toxicants by finding the composition of the fuel combustion products prior to its utilization.

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Employing CO2 as reaction medium for in-situ suppression of the formation of benzene derivatives and polycyclic aromatic hydrocarbons during pyrolysis of simulated municipal solid waste

Cited by 41 publications

References 38 publications

Syngas Quality Enhancement by CO₂ Injection during the Co-Gasification of Biomass and Plastic

Syngas Quality Enhancement by CO₂ Injection during the Co-Gasification of Biomass and Plastic

Energy recovery from banner waste through catalytic pyrolysis over cobalt oxide: Effects of catalyst configuration

Formation of soot in the disposal of municipal solid waste

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Employing CO2 as reaction medium for in-situ suppression of the formation of benzene derivatives and polycyclic aromatic hydrocarbons during pyrolysis of simulated municipal solid waste

Cited by 41 publications

References 38 publications

Syngas Quality Enhancement by CO2 Injection during the Co-Gasification of Biomass and Plastic

Syngas Quality Enhancement by CO2 Injection during the Co-Gasification of Biomass and Plastic

Energy recovery from banner waste through catalytic pyrolysis over cobalt oxide: Effects of catalyst configuration

Formation of soot in the disposal of municipal solid waste

Contact Info

Product

Resources

About

Syngas Quality Enhancement by CO₂ Injection during the Co-Gasification of Biomass and Plastic

Syngas Quality Enhancement by CO₂ Injection during the Co-Gasification of Biomass and Plastic