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

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

Research output: Contribution to journalArticlepeer-review

Abstract

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 <NPs<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 micropyrolysis 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 ≈ 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 reaction. 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.

Original languageEnglish
JournalCatalysis Today
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • BTX
  • Catalytic pyrolysis
  • Noble metal
  • Titanate nanotubes
  • Waste tires

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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