Characterization and controlled combustion of carbonaceous deactivating species deposited on an activated carbon-based catalyst

T. Cordero-Lanzac, I. Hita, A. Veloso, J. M. Arandes, J. Rodríguez-Mirasol, J. Bilbao, T. Cordero, P. Castaño*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

The composition of the carbonaceous deactivating species (coke) deposited on a Pt and Pd supported P-containing activated carbon catalyst has been studied. These deactivating species were deposited on the catalyst during the hydrocracking of scrap tire pyrolysis oil at 400–500 °C, and it has been selectively characterized by means of temperature-programmed oxidation (TPO), temperature-programmed desorption/gas chromatography (TPD/GC) and laser desorption-ionization/mass spectroscopy (LDI/MS). In addition, the evolution of the textural properties and the acidity of the deactivated catalysts have been evaluated. The high thermal and oxidation resistance of the catalytic support has allowed to combust the coke in the TPO and calculate its intrinsic activation energy as a function of the extent of the combustion. Combined TPO and LDI/MS results have shown that an increase in the hydrocracking temperature attenuates the catalyst deactivation due to the hydrocracking of coke precursors. Coke aging, by evolving towards a more condensed structure, is also favored at higher hydrocracking temperatures. The combustion of the most condensed coke requires of higher temperatures than 375 °C, which hinders the complete regeneration of the activated carbon-based catalyst.

Original languageEnglish (US)
Pages (from-to)454-464
Number of pages11
JournalChemical Engineering Journal
Volume327
DOIs
StatePublished - Jan 1 2017

Keywords

  • Activated carbon
  • Coke
  • Deactivation
  • Hydrocracking
  • Regeneration
  • Tire oil

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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