Pyrolysis of Polyethylene Terephthalate Granules in Presence of Lewis Brønsted Acid Sites Catalysts

Abstract Among municipal polymer wastes, Polyethylene Terephthalate (PET) is a unique agent because of its widespread usage and broad range of gaseous products in its catalytic cracking process. Pyrolysis of polyethylene terephthalate (PET) in a semi-batch reactor was investigated using a Lewis Brønsted acid sites catalysts. Experiments were performed under isothermal condition to determine reaction kinetic parameters, product compositions, catalyst/PET mass ratio and temperature effect on the conversion. The products of reaction consist of gas, solid, and liquid phase with a maximum liquid product of 6% at 350 ºC. The optimal catalyst/PET mass ratio and temperature were determined. Additionally, the reaction order and activation energy for the reaction were detected.

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Catalytic pyrolysis of waste polyethylene terephthalate granules using a Lewis-Brønsted acid sites catalyst

Clean Technologies and Environmental Policy ◽

10.1007/s10098-021-02260-3 ◽

2022 ◽

Author(s):

Aref Shahi ◽

Behrooz Roozbehani ◽

Mojtaba Mirdrikvand

Keyword(s):

Polyethylene Terephthalate ◽

Catalytic Pyrolysis ◽

Acid Sites ◽

Bronsted Acid ◽

Brønsted Acid ◽

Brønsted Acid Sites ◽

Brönsted Acid ◽

Brönsted Acid Sites ◽

Waste Polyethylene ◽

Bronsted Acid Sites

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On the Role of Protonic Acid Sites in Cu Loaded FAU31 Zeolite as a Catalyst for the Catalytic Transformation of Furfural to Furan

Molecules ◽

10.3390/molecules26072015 ◽

2021 ◽

Vol 26 (7) ◽

pp. 2015

Author(s):

Łukasz Kuterasiński ◽

Małgorzata Smoliło-Utrata ◽

Joanna Kaim ◽

Wojciech Rojek ◽

Jerzy Podobiński ◽

...

Keyword(s):

Active Sites ◽

Acid Sites ◽

Bronsted Acid ◽

Brønsted Acid ◽

Brønsted Acid Sites ◽

Protonic Acid ◽

Brönsted Acid ◽

Brönsted Acid Sites ◽

Bronsted Acid Sites

The aim of the present paper is to study the speciation and the role of different active site types (copper species and Brønsted acid sites) in the direct synthesis of furan from furfural catalyzed by copper-exchanged FAU31 zeolite. Four series of samples were prepared by using different conditions of post-synthesis treatment, which exhibit none, one or two types of active sites. The catalysts were characterized by XRD, low-temperature sorption of nitrogen, SEM, H2-TPR, NMR and by means of IR spectroscopy with ammonia and CO sorption as probe molecules to assess the types of active sites. All catalyst underwent catalytic tests. The performed experiments allowed to propose the relation between the kind of active centers (Cu or Brønsted acid sites) and the type of detected products (2-metylfuran and furan) obtained in the studied reaction. It was found that the production of 2-methylfuran (in trace amounts) is determined by the presence of the redox-type centers, while the protonic acid sites are mainly responsible for the furan production and catalytic activity in the whole temperature range. All studied catalysts revealed very high susceptibility to coking due to polymerization of furfural.

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