TY - JOUR
T1 - Valorization of Waste Tires via Catalytic Fast Pyrolysis Using Palladium Supported on Natural Halloysite
AU - Osorio-Vargas, Paula
AU - Shanmugaraj, Krishnamoorthy
AU - Herrera, Carla
AU - Campos, Cristian H.
AU - Torres, Cecilia C.
AU - Castillo-Puchi, Francisca
AU - Arteaga-Pérez, Luis E.
N1 - Publisher Copyright:
© 2021 American Chemical Society.
PY - 2021
Y1 - 2021
N2 - We report for the first time Pd nanoparticles (NPs) supported on natural halloysite as catalysts for selective production of p-cymene from waste tire pyrolysis (WTP). The catalysts were prepared by dispersing Pd NPs on either the inner (PdHin, 3.4 nm) or outer surface (PdHout, 1.6 nm) of halloysite nanotubes to produce different acid-base properties. The performance of these catalysts for WTP was studied by micropyrolysis coupled to mass spectrometry (Py-GC/MS) between 400 and 500 °C and for discrete times (2, 12, 20, and 40 s). PdHin exhibited twice the selectivity (42%) of PdHout, which was attributed to its higher acidity (1.74 mequiv g-1) and its bifunctionality established between the support's acidity and the Pd0 sites. From discrete time-dependent experiments, we estimated activation energies for waste tire conversion (72.8 kJ/mol) and p-cymene production on PdHin (101.0 kJ/mol) under a kinetically controlled regime (Biot ∼3.1, PyI ≫1, and PyII ≫1).
AB - We report for the first time Pd nanoparticles (NPs) supported on natural halloysite as catalysts for selective production of p-cymene from waste tire pyrolysis (WTP). The catalysts were prepared by dispersing Pd NPs on either the inner (PdHin, 3.4 nm) or outer surface (PdHout, 1.6 nm) of halloysite nanotubes to produce different acid-base properties. The performance of these catalysts for WTP was studied by micropyrolysis coupled to mass spectrometry (Py-GC/MS) between 400 and 500 °C and for discrete times (2, 12, 20, and 40 s). PdHin exhibited twice the selectivity (42%) of PdHout, which was attributed to its higher acidity (1.74 mequiv g-1) and its bifunctionality established between the support's acidity and the Pd0 sites. From discrete time-dependent experiments, we estimated activation energies for waste tire conversion (72.8 kJ/mol) and p-cymene production on PdHin (101.0 kJ/mol) under a kinetically controlled regime (Biot ∼3.1, PyI ≫1, and PyII ≫1).
UR - http://www.scopus.com/inward/record.url?scp=85115936998&partnerID=8YFLogxK
U2 - 10.1021/acs.iecr.1c02797
DO - 10.1021/acs.iecr.1c02797
M3 - Article
AN - SCOPUS:85115936998
SN - 0888-5885
JO - Industrial and Engineering Chemistry Research
JF - Industrial and Engineering Chemistry Research
ER -