Catalytic pyrolysis of used tires on noble-metal-based catalysts to obtain high-value chemicals: Reaction pathways

Osorio-Vargas, Paula; Campos, Cristian H.; Torres, Cecilia C.; Herrera, Carla; Shanmugaraj, Krishnamoorthy; Bustamante, Tatiana M.; de Leon, J. N. Diaz; Medina, Francisco; Arteaga-Perez, Luis E.


A systematic study on the use of noble metals (Pd, Pt, Au) supported on titanate nanotubes (NT-Ti) for selectively producing BTX and p-cymene from waste tire pyrolysis is provided here. All the materials were characterized for chemical, textural and structural properties using a range of analytical techniques. The M/NT-Ti (M: Pd, Pt, or Au) catalysts exhibit low nanoparticle sizes (1.8 2.2 nm), and a homogeneous pore size distribution. The catalysts demonstrated excellent activity for converting WT into BTX-enriched oil when tested in a micro-pyrolysis system coupled to chromatography/mass spectrometry (Py-GC/MS). The BTX production was enhanced by the presence of catalysts with a selectivity order as follows Pd > Pt AP;Au > support > non-catalyst. The Py-GC/MS suggest that the catalysts participate in the secondary reactions of dealkylation, dehydrogenation, isomerization, aromatization, and cyclization leading to a higher formation of BTX than the uncatalyzed reac-tion. Finally, a comprehensive reaction pathway describing the catalytic pyrolysis of WT over Pd/NT-Ti was proposed by studying the catalytic pyrolysis of individual polymers constituting the waste tires, and D,L-Limonene.

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Título según WOS: ID WOS:000810542500005 Not found in local WOS DB
Título de la Revista: CATALYSIS TODAY
Volumen: 394
Editorial: Elsevier
Fecha de publicación: 2022
Página de inicio: 475
Página final: 485


Notas: ISI