On the dynamics and reversibility of the deactivation of a Rh/CeO2-ZrO2 catalyst in raw bio-oil steam reforming

Aingeru Remiro*, Aitor Ochoa, Aitor Arandia, Pedro Castano, Javier Bilbao, Ana G. Gayubo

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

15 Citations (Scopus)
5 Downloads (Pure)

Abstract

The deactivation mechanism of a commercial Rh/CeO2-ZrO2 catalyst in raw bio-oil steam reforming has been studied by relating the evolution with time on stream of the bio-oil conversion and products yields and the physicochemical properties of the deactivated catalyst studied by XRD, TPR, SEM, XPS, TPO and TEM. Moreover, the reversibility of the different deactivation causes has been assessed by comparing the behavior and properties of the catalyst fresh and regenerated (by coke combustion with air). The reactions were carried out in an experimental device with two units in series: a thermal treatment unit (at 500 degrees C, for separation of pyrolytic lignin) and a fluidized bed reactor (at 700 degrees C, for the reforming reaction). The results evidence that structural changes (support aging involving partial occlusion of Rh species) are irreversible and occur rapidly, being responsible for a first deactivation period, whereas encapsulating coke deposition (with oxygenates as precursors) is reversible and evolves more slowly, thus being the main cause of the second deactivation period. The deactivation selectively affects the reforming of oxygenates, from least to greatest reactivity. Rh sintering is not a significant deactivation cause at the studied temperature.

Original languageEnglish
Pages (from-to)2620-2632
Number of pages13
JournalInternational Journal of Hydrogen Energy
Volume44
Issue number5
DOIs
Publication statusPublished - 28 Jan 2019
MoE publication typeA1 Journal article-refereed

Keywords

  • Bio-oil
  • Hydrogen
  • Steam reforming
  • Rh catalyst
  • Deactivation
  • NI SUPPORTED CATALYST
  • FLUIDIZED-BED REACTOR
  • GAS SHIFT REACTION
  • HYDROGEN-PRODUCTION
  • NI/LA2O3-ALPHA-AL2O3 CATALYST
  • ACETIC-ACID
  • OPERATING-CONDITIONS
  • PARTIAL OXIDATION
  • AQUEOUS FRACTION
  • REACTION PATHWAY

Cite this