The effect of silica–alumina catalysts on degradation of polyolefins by a continuous flow reactor

Murata, Kiku; Brebu, Mihai; Sakata, Yusaku

doi:10.1016/j.jaap.2010.05.002

Cited by 28 publications

(12 citation statements)

References 33 publications

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“…In order to overcome these problems, several reactors design have been studied from lab to pilot plant scale reactors with several improvements to attain specific objectives [22]. Stirred reactors have been proposed as a simpler alternative to improve the heat supply to the plastic and to minimize heat transfer limitations [21], [23], [24]. Reactors of different configurations have been reported.…”

Section: Introductionmentioning

confidence: 99%

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Catalytic degradation of linear low-density polyethylene over HY-zeolite via pre-degradation method

Muhammad

Makwashi

Manos

2019

Journal of Analytical and Applied Pyrolysis

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The catalytic degradation of linear low-density (lldPE) polyethylene over HY-zeolite catalyst was studied in a semi-batch reactor. One of the important problems encountered during catalytic pyrolysis of macromolecules is the contact with the catalyst, which is known to affect the product distribution and the quality of the coke formed. A pre-degradation procedure was introduced to achieve efficient contact between the LLDPE macromolecules and the catalyst. The influence of the pre-degradation to the reaction conditions including holding time, temperature, polymer to catalyst ratio and flow rate of carrier gas was examined. Moreover, the pre-degradation results were compared with the results obtained using normal mixing procedure. The results obtained showed that, pre-degradation promotes the liquid fraction by a factor of more than one-fold increase at the expense of the gas fraction and the coke yield. The optimal liquid fraction with pre-degradation was obtained at low reaction temperature and catalyst amount respectively, i.e. high polymer to catalyst ratio, making it economically viable method for the degradation of lldPE.

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Section: Introductionmentioning

confidence: 99%

“…Batch and semi-batch reactors have been used for thermal and catalytic pyrolysis of virgin and waste plastic, they have the advantage of simple design and easy to control process parameters [12], [23], [25].…”

Section: Introductionmentioning

confidence: 99%

Catalytic degradation of linear low-density polyethylene over HY-zeolite via pre-degradation method

Muhammad

Makwashi

Manos

2019

Journal of Analytical and Applied Pyrolysis

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“…Moreover, specific properties of the catalysts like surface acidity/basicity, specific surface area and pore size distribution also determine the yield and selectivity of various products. Slow pyrolysis of PS was investigated in presence of catalysts like AlCl 3 [16], transition metal oxides [17], solid acids like silica, alumina and silica-alumina of different compositions [17][18][19][20][21], zeolites like H-Y, HZSM-5, BEA and HMCM-41 [18,19], solid bases [21], clinoptilolite [22], mordenite [23] and halloysite clays [24]. The above studies evaluated the properties of the catalysts that led to the formation of condensable products.…”

Section: Introductionmentioning

confidence: 99%

Resource recovery via catalytic fast pyrolysis of polystyrene using zeolites

Ojha

Vinu

2015

Journal of Analytical and Applied Pyrolysis

108

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“…However, it has a drawback in the stability of the process especially for large scale applications. Therefore, continuous flow operation is a suitable technique to study the degaradation of plastics because the experimental data are obtained at steady state, that is, at a constant temperature, a constant pressure, and a constant amount of reactor content (Murata, Brebu, & Sakata, 2010).…”

Section: Introductionmentioning

confidence: 99%

Co-Production of Liquid and Gaseous Fuels from Polyethylene and Polystyrene in a Continuous Sequential Pyrolysis and Catalytic Reforming System

Syamsiro¹,

H²,

Komoto³

et al. 2013

EER

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This paper deals with the potential of using sequential pyrolysis and catalytic reforming process in a continuous system for the conversion of polyethylene and polystyrene into liquid and gaseous fuels using the HY-zeolite catalyst for the catalytic reforming of pyrolysis gas generated in a pyrolyzer. The effect of reforming temperature and the weight hourly space velocity on the product yields, liquid and gaseous compositions have been investigated for each feedstock. The experiments were carried out at the pyrolyzer temperature of 450 °C, the reforming temperature of 400, 450, and 500 °C and the weight hourly space velocity of 2, 3, and 4 g-sample g-catalyst -1 h -1 . The results show that increasing the reforming temperature and decreasing the weight hourly space velocity have resulted in an increase of gaseous and solid products while the liquid product decreased. The maximum oil production for HDPE (70.0wt%) and PS (88.1wt%) were obtained at the pyrolysis temperature of 450 °C, the reforming temperature of 450 °C and the weight hourly space velocity of 4. The C2, C3 and C4+ gases (>75 mol %) were the main components of the gaseous and liquid products for HDPE. In case of PS, the C2 and C3 gases (>65 mol %) were the main components of the gaseous product. The high quality of gaseous products can be used as a fuel either for driving gas engines or for dual-fuel diesel engines.

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The effect of silica–alumina catalysts on degradation of polyolefins by a continuous flow reactor

Cited by 28 publications

References 33 publications

Catalytic degradation of linear low-density polyethylene over HY-zeolite via pre-degradation method

Catalytic degradation of linear low-density polyethylene over HY-zeolite via pre-degradation method

Resource recovery via catalytic fast pyrolysis of polystyrene using zeolites

Co-Production of Liquid and Gaseous Fuels from Polyethylene and Polystyrene in a Continuous Sequential Pyrolysis and Catalytic Reforming System

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