Temperature Programmed Oxidation Coupled with In Situ Techniques Reveal the Nature and Location of Coke Deposited on a Ni/La2O3-αAl2O3 Catalyst in the Steam Reforming of Bio-oil

Aitor Ochoa*, Beatriz Valle, Daniel E. Resasco, Javier Bilbao, Ana G. Gayubo, Pedro Castaño

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

The characterization of coke deposited on a Ni/La2O3-αAl2O3 catalyst used in the steam reforming of bio-oil has been studied by temperature programmed oxidation (TPO) coupled with different in situ techniques: thermogravimetry (TG), modulated thermogravimetry (MTG), FTIR spectroscopy with mass spectrometry (MS), Raman spectroscopy, and differential scanning calorimetry (DSC). The steam reforming of bio-oil was carried out in a reactor equipment with two steps in series, comprising bio-oil thermal treatment (500 °C) and subsequent reforming in a fluidized bed reactor (550–700 °C; and steam-to-carbon ratio, 1.5–6). TG/MS-TPO experiments identify encapsulating and filamentous coke, and a more detailed analysis using other in situ techniques enable to characterize the nature and location of 4 types of coke: (i) an encapsulating coke with aliphatic nature placed in the most superficial layers; (ii) an encapsulating coke with higher aromatic nature in inner layers; (iii) the most superficial layers of a filamentous coke, further from active sites and with a more carbonized structure compared to encapsulating coke; and (iv) an innermost and mainly polyaromatic filamentous coke with a low oxygenates content.
Original languageEnglish (US)
Pages (from-to)2311-2321
Number of pages11
JournalChemCatChem
Volume10
Issue number10
DOIs
StatePublished - May 24 2018
Externally publishedYes

Keywords

  • carbon
  • catalyst deactivation
  • combustion
  • green chemistry
  • in situ characterization

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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