Thermal Behavior, Reaction Pathways and Kinetic Implications of Using a Ni/SiO2 Catalyst for Waste Tire Pyrolysis

Catalytic pyrolysis has been used to upgrading the quality of pyrolytic liquids. Herein, we report a comprehensive study on the catalytic pyrolysis of waste tires using Ni/SiO 2 as catalysts. The analyses were carried out by combining thermogravimetry (TGA), TGA interfaced to a Fourier transform inf...

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Veröffentlicht in:Waste and biomass valorization 2021-12, Vol.12 (12), p.6465-6479
Hauptverfasser: Osorio-Vargas, Paula, Lick, Ileana D., Sobrevía, Felipe, Correa-Muriel, Daniela, Menares, Tamara, Manrique, Raydel, Casella, Monica L., Arteaga-Pérez, Luis E.
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container_end_page 6479
container_issue 12
container_start_page 6465
container_title Waste and biomass valorization
container_volume 12
creator Osorio-Vargas, Paula
Lick, Ileana D.
Sobrevía, Felipe
Correa-Muriel, Daniela
Menares, Tamara
Manrique, Raydel
Casella, Monica L.
Arteaga-Pérez, Luis E.
description Catalytic pyrolysis has been used to upgrading the quality of pyrolytic liquids. Herein, we report a comprehensive study on the catalytic pyrolysis of waste tires using Ni/SiO 2 as catalysts. The analyses were carried out by combining thermogravimetry (TGA), TGA interfaced to a Fourier transform infrared spectrometer (TGA–FTIR), and pyrolysis coupled to gas chromatography/mass spectrometer (Py–GC/MS) techniques. During waste tire decomposition, the main functional groups detected in the FTIR were alkenes, aromatics, and heteroatoms-containing groups such as nitrogen, sulfur, and oxygen. Meanwhile, by Py–GC/MS were identified mainly D,L-limonene, isoprene, benzene, toluene, xylenes (BTX), and p-cymene. The Py–GC/MS experiments at three different temperatures (350, 400, and 450 °C) suggested an effect of the catalyst on product distribution. The Ni catalyst promoted cyclization reactions and subsequently aromatization, leading to an improved vapors composition. The use of iso-conversional kinetic models along with master plots allows proposing a multiple-step reaction mechanism, which was well described by the Avrami–Erofeev, Random Scission, and truncated Sestak–Berggren models. The values of activation energies show differences for the catalyzed and uncatalyzed pyrolysis (111.0 kJ mol −1 and 168.4 kJ mol −1 ), validating the effectivity of Ni/SiO 2 . Finally, the thermal Biot (> 1) and Py I and Py II numbers (10 –3  
doi_str_mv 10.1007/s12649-021-01494-y
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The use of iso-conversional kinetic models along with master plots allows proposing a multiple-step reaction mechanism, which was well described by the Avrami–Erofeev, Random Scission, and truncated Sestak–Berggren models. The values of activation energies show differences for the catalyzed and uncatalyzed pyrolysis (111.0 kJ mol −1 and 168.4 kJ mol −1 ), validating the effectivity of Ni/SiO 2 . Finally, the thermal Biot (&gt; 1) and Py I and Py II numbers (10 –3  &lt; Py I  &lt; 10 –1 and 10 –2  &lt; Py II  &lt; 10 –3 ) confirms that the process is being occurred between the kinetic and the convection-limited regimes. 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The use of iso-conversional kinetic models along with master plots allows proposing a multiple-step reaction mechanism, which was well described by the Avrami–Erofeev, Random Scission, and truncated Sestak–Berggren models. The values of activation energies show differences for the catalyzed and uncatalyzed pyrolysis (111.0 kJ mol −1 and 168.4 kJ mol −1 ), validating the effectivity of Ni/SiO 2 . Finally, the thermal Biot (&gt; 1) and Py I and Py II numbers (10 –3  &lt; Py I  &lt; 10 –1 and 10 –2  &lt; Py II  &lt; 10 –3 ) confirms that the process is being occurred between the kinetic and the convection-limited regimes. 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The use of iso-conversional kinetic models along with master plots allows proposing a multiple-step reaction mechanism, which was well described by the Avrami–Erofeev, Random Scission, and truncated Sestak–Berggren models. The values of activation energies show differences for the catalyzed and uncatalyzed pyrolysis (111.0 kJ mol −1 and 168.4 kJ mol −1 ), validating the effectivity of Ni/SiO 2 . Finally, the thermal Biot (&gt; 1) and Py I and Py II numbers (10 –3  &lt; Py I  &lt; 10 –1 and 10 –2  &lt; Py II  &lt; 10 –3 ) confirms that the process is being occurred between the kinetic and the convection-limited regimes. Graphic Abstract</abstract><cop>Dordrecht</cop><pub>Springer Netherlands</pub><doi>10.1007/s12649-021-01494-y</doi><tpages>15</tpages><oa>free_for_read</oa></addata></record>
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subjects Alkenes
Aromatic compounds
Benzene
Catalysts
Chemical reactions
Cleavage
Convection
Engineering
Environment
Environmental Engineering/Biotechnology
Fourier transforms
FTIR spectrometers
Functional groups
Gas chromatography
Industrial Pollution Prevention
Infrared spectrometers
Infrared spectroscopy
Isoprene
Limonene
Original Paper
p-Cymene
Pyrolysis
Reaction mechanisms
Renewable and Green Energy
Silicon dioxide
Sulfur
Thermodynamic properties
Thermogravimetry
Tires
Toluene
Vapors
Waste Management/Waste Technology
title Thermal Behavior, Reaction Pathways and Kinetic Implications of Using a Ni/SiO2 Catalyst for Waste Tire Pyrolysis
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