Oxidative steam reforming of raw bio-oil over supported and bulk Ni catalysts for hydrogen production

A. Arandia, A. Remiro (Corresponding Author), V. García, P. Castaño, J. Bilbao, A.G. Gayubo

Research output: Contribution to journalArticleScientificpeer-review

33 Citations (Scopus)

Abstract

Several Ni catalysts of supported (on La 2O 3-αAl 2O 3, CeO 2, and CeO 2-ZrO 2) or bulk types (Ni-La perovskites and NiAl 2O 4 spinel) have been tested in the oxidative steam reforming (OSR) of raw bio-oil, and special attention has been paid to the catalysts’ regenerability by means of studies on reaction-regeneration cycles. The experimental set-up consists of two units in series, for the separation of pyrolytic lignin in the first step (at 500°C) and the on line OSR of the remaining oxygenates in a fluidized bed reactor at 700°C. The spent catalysts have been characterized by N 2 adsorption-desorption, X-ray diffraction and temperature programmed reduction, and temperature programmed oxidation (TPO). The results reveal that among the supported catalysts, the best balance between activity-H 2 selectivity-stability corresponds to Ni/La 2O 3-αAl 2O 3, due to its smaller Ni 0 particle size. Additionally, it is more selective to H 2 than perovskite catalysts and more stable than both perovskites and the spinel catalyst. However, the activity of the bulk NiAl 2O 4 spinel catalyst can be completely recovered after regeneration by coke combustion at 850°C because the spinel structure is completely recovered, which facilitates the dispersion of Ni in the reduction step prior to reaction. Consequently, this catalyst is suitable for the OSR at a higher scale in reaction-regeneration cycles.

Original languageEnglish
Article number322
JournalCatalysts
Volume8
Issue number8
DOIs
Publication statusPublished - 2018
MoE publication typeA1 Journal article-refereed

Keywords

  • Bio-oil
  • Deactivation
  • H production
  • Ni catalyst
  • Oxidative steam reforming
  • Regeneration

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