Revista UIS Ingenierías

Vol. 22 No. 1 (2023): Revista UIS Ingenierías
Articles

Toluene hydrogenation and ring-opening on bimetallic Pd-Pt/HY catalysts

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  • Trino Romero,
  • Luis Melo ,
  • María Esparragoza ,
  • Rosarmy Ávila ,
  • Alexander Moronta,
  • Gabriela Carruyo ,
  • Luis García
Trino Romero
Universidad Central de Venezuela
Luis Melo
Universidad Central de Venezuela
María Esparragoza
Universidad Central de Venezuela
Rosarmy Ávila
Universidad Central de Venezuela
Alexander Moronta
Universidad del Zulia
Gabriela Carruyo
Universidad del Zulia
Luis García
Universidad Central de Venezuela
DOI: https://doi.org/10.18273/revuin.v22n1-2023003

Published 2023-01-03

Keywords

  • toluene hydrogenation,
  • ring-opening,
  • platinum-palladium,
  • HY zeolite

How to Cite

Romero, T. ., Melo , L., Esparragoza , M. ., Ávila , R. ., Moronta, A. ., Carruyo , G. ., & García , L. . (2023). Toluene hydrogenation and ring-opening on bimetallic Pd-Pt/HY catalysts. Revista UIS Ingenierías, 22(1), 25–34. https://doi.org/10.18273/revuin.v22n1-2023003

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Abstract

Bimetallic Pd-Pt/HY catalysts prepared by the co-impregnation method with an atomic variation of Pd/Pd+Pt were studied to convert toluene and methylcyclohexane. The catalysts were characterized by the BET method, chemisorption of CO by the pulse method, programmed temperature reduction (H2-TPR), and programmed ammonia thermo-desorption (NH3TPD). Results of chemisorption of CO and H2-TPR for Pd-Pt/HY catalysts suggest the existence of a strong interaction between Pd and Pt. The NH3-TPD showed that incorporating metals influences the percentage of relative distribution of weak/strong acid sites presented in decreasing order of acidity: Pd0Pt100/HY>Pd100Pt0/HY>Pd33Pt67/HY. Atomic composition Pd/Pd+Pt equal to 0.33, and relative distribution of weak/strong acid sites equal to 2, favor hydrogenation of toluene to methylcyclohexane in metal sites and subsequent skeletal isomerization in the acidic sites through dimethylcyclopentane intermediate and ring-opening in the metal sites, leading to increased formation of n-heptane relative to iso-heptane. 

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