Deactivation and regeneration of ZSM-5 zeolite in catalytic pyrolysis of plastic wastes

López, A.; Marco, I. de; Caballero, B.M.; Adrados, A.; Laresgoiti, M.F.

doi:10.1016/j.wasman.2011.04.004

Cited by 152 publications

(86 citation statements)

References 27 publications

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“…The mechanism for the degradation of polystyrene in the presence of zeolite catalysts has been discussed by several authors [21][22][23][24]. Serrano et al [24] suggest that the catalytic cracking of polystyrene may proceed through a complex combination of different reactions.…”

Section: Oil Compostionmentioning

confidence: 99%

“…They suggested that the thermal degradation of polystyrene starts with random initiation to form polymer radicals, but in the presence of the catalysts degradation is extended in the form of cracking and hydrogenation reactions resulting in decreased styrene concentration. Lopez et al [22] also suggested that the styrene produced from thermal pyrolysis is further degraded to other hydrocarbons via secondary reactions in the presence of the catalyst. Puente et al [23] investigated the catalytic pyrolysis of polystyrene and polystyrene-polybutadiene using an FCC catalyst (fluid catalytic cracking catalyst from the petroleum refining industry).…”

Section: Oil Compostionmentioning

confidence: 99%

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Catalytic pyrolysis of waste plastic from electrical and electronic equipment

Muhammad

Onwudili

Williams

2015

Journal of Analytical and Applied Pyrolysis

104

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Plastic waste collected from waste electrical and electronic equipment (WEEE) was pyrolysed in the presence of zeolite catalysts to produce a gasoline range aromatic oil. The plastic was from equipment containing cathode ray tubes (CRTs) and also plastic waste from refrigeration equipment. In addition, for comparison the main plastics contained in the WEEE, in the form of high impact polystyrene (HIPS) and acrylonitrile-butadiene-styrene (ABS) were also pyrolysed in the presence of the zeolite catalysts. Two zeolite catalysts; Y zeolite and ZSM-5 were used. Catalytic pyrolysis took place in a two stage fixed bed, batch reactor with the plastic pyrolysed in the first stage and the evolved pyrolysis gases catalysed in the second stage reactor. The quantity of oil produced from uncatalysed pyrolysis of plastics from CRTs and refridgerators was more than 80 wt%. The gases consisted of hydrogen, methane and C 2 -C 4 hydrocarbons. When the zeolite catalysts were introduced there was a decrease of between 5-10 wt% in oil yield and a corresponding increase in gas yield.The composition of the oils derived from the uncatalysed pyrolysis of WEEE plastics were mainly aromatic with high concentrations of styrene, derived from the HIPS and ABS present in the plastic waste. Addition of the zeolite ZSM-5 and Y zeolite to the pyrolysis process resulted in significant concentrations of benzene, toluene and ethylbenzene in the product oil but reduced concentrations of styrene. The oils from both thermal and catalysed pyrolysis also contained significant concentrations of polycyclic aromatic hydrocarbons for example, naphthalene, phenanthrene and pyrene.

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Section: Oil Compostionmentioning

confidence: 99%

Section: Oil Compostionmentioning

confidence: 99%

Catalytic pyrolysis of waste plastic from electrical and electronic equipment

Muhammad

Onwudili

Williams

2015

Journal of Analytical and Applied Pyrolysis

104

View full text Add to dashboard Cite

show abstract

“…In the process of pyrolysis, where heating occurs in the absence of oxygen, the organic compounds are decomposed generating gaseous and liquid products, which can be used as fuels and / or sources of chemicals. Meanwhile, the inorganic material, free of organic matter, remains unchanged under the solid fraction and can be recycled later [17] .…”

Section: Introductionmentioning

confidence: 99%

Thermal and catalytic pyrolysis of plastic waste

2016

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“…Thermal pyrolysis which is uncatalyzed gives low quality products over a wide range [13]. However, application of suitable catalysts in catalytic pyrolysis has the potential to narrow the range of final products leading to outstanding selectivity for getting valuable products at lower temperatures [14]. Pyrolysis is a process that involves thermochemical breakdown of organic material at elevated temperatures 300-900°C in oxygen free environment, resulting in oil and gas yields with char as the solid residue.…”

Section: Introductionmentioning

confidence: 99%

Microwave assisted pyrolysis of plastic waste for production of fuels: a review

et al. 2017

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Abstract. This paper presents an overview of advantages of microwave assisted pyrolysis of waste plastics together with its limitations. It has been established that microwave induced pyrolysis can be used to get value added chemicals and fuels through its numerous noted advantages in contrast to conventional pyrolysis. The process has the potential for fast, volumetric and selective heating of plastics for the recovery of energy. The limitation in the use of dielectric material as absorbent in plastic pyrolysis has been highlighted. Special focus has been given to the constraints encountered in the accurate measurement of temperature and uniform heating in microwave assisted pyrolysis. A new alternative method based on microwave-metal interaction in the pyrolysis of plastic waste has been presented. Further it has been realized that proper investigation and understanding of microwave process shortcomings is fundamental to the successful implementation of the technology and at the same time provide a sustainable environment in the endeavor for waste to energy mission.

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Deactivation and regeneration of ZSM-5 zeolite in catalytic pyrolysis of plastic wastes

Cited by 152 publications

References 27 publications

Catalytic pyrolysis of waste plastic from electrical and electronic equipment

Catalytic pyrolysis of waste plastic from electrical and electronic equipment

Thermal and catalytic pyrolysis of plastic waste

Microwave assisted pyrolysis of plastic waste for production of fuels: a review

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