Authors:
F. Sinfrônio Universidade Federal da Paraíba Departamento de Química, CCEN João Pessoa, Paraíba Brazil 58059-900

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A. Souza Universidade Federal da Paraíba Departamento de Química, CCEN João Pessoa, Paraíba Brazil 58059-900

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Ieda Santos Universidade Federal da Paraíba Departamento de Química, CCEN João Pessoa, Paraíba Brazil 58059-900

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V. Fernandes Jr. Universidade Federal do Rio Grande do Norte Departamento de Química, CCET Natal, Rio Grande do Norte Brazil

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Cs. Novák Hungarian Academy of Sciences, Budapest University of Technology and Economics Research Group of Technical Analytical Chemistry Budapest Hungary 1111 Szt. Gellért tér 4

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Zsuzsanna Éhen Budapest University of Technology and Economics Institute of General and Analytical Chemistry Budapest Hungary 1111 Szt. Gellért tér 4

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Abstract  

Thermogravimetry (TG) and mass spectrometry (MS) combined techniques have been used to investigate the thermal degradation and catalytic decomposition of high-density polyethylene (HDPE) over solid acid catalysts as H-ZSM-5, Al-MCM-41 and a hybrid material with a bimodal pore size distribution (H-ZSM-5/Al-MCM-41). The silicon/aluminum ratio of all catalysts is 15. Both thermal and catalytic processes showed total conversion in a single mass loss step. Furthermore, the catalytic conversion presents average reduction of 27.4%, in the onset decomposition temperature. The kinetic parameters were calculated using non-isothermal method. These parameters do not indicate significant differences between the thermal and catalytic processes. Even though, the presence of the catalysts changes the reaction mechanism, from phase boundary controlled reaction to random nucleation mechanism. Important difference in distribution of evolved products was detected when several catalysts were used. However, in all cases the main products were alkanes (C2, C3 and C4), alkenes (C3 and C4), dienes (C4 and C5) and traces of aromatic compounds.

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation
1969
Volumes
per Year
1
Issues
per Year
24
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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