Assessment of thermogravimetric methods for calculating coke combustion-regeneration kinetics of deactivated catalyst

Aitor Ochoa, Álvaro Ibarra, Javier Bilbao, José M. Arandes, Pedro Castaño

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

This work compares different methodologies for calculating the kinetic parameters of coke combustion, employed for catalyst regeneration, using thermogravimetric methods. A reference fluid catalytic cracking (FCC) spent catalyst was used as a representative example of the deactivated catalyst for the combustion runs, pre-used in the cracking of a vacuum gas oil at 773 K and 3 s. Three different types of approaches have been performed in order to obtain kinetic combustion parameters: (i) kinetic model-based, (ii) isoconversional and (iii) modulated methods. Additionally, a series of empirical modifications have been proposed to predict the kinetic behavior at different heating rates for the model-based approach. Using the best conditions and methods, the combustion activation energy of coke, deposited after the reaction mentioned, is in the order of ∼114, ∼156, and ∼162 kJ mol−1 for the kinetic model-based, isoconversional and modulated methods, respectively. The recommendations for measuring kinetic parameters are reported together with the benefits/disadvantages using the three mentioned approaches.

Original languageEnglish (US)
Pages (from-to)459-470
Number of pages12
JournalChemical Engineering Science
Volume171
DOIs
StatePublished - Jan 1 2017
Externally publishedYes

Keywords

  • Coke combustion
  • Isoconversional
  • Kinetic modeling
  • Modulation
  • Thermogravimetry

ASJC Scopus subject areas

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

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