Synergy in lignin upgrading by a combination of Cu-based mixed oxide and Ni-phosphide catalysts in supercritical ethanol

T.I. Koranyi, X. Huang, A.E. Coumans, E.J.M. Hensen

Research output: Contribution to journalArticleAcademicpeer-review

25 Citations (Scopus)
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Abstract

The depolymerization of lignin to bioaromatics usually requires a hydrodeoxygenation (HDO) step to lower the oxygen content. A mixed Cu–Mg–Al oxide (CuMgAlOx) is an effective catalyst for the depolymerization of lignin in supercritical ethanol. We explored the use of Ni-based cocatalysts, i.e. Ni/SiO2, Ni2P/SiO2, and Ni/ASA (ASA = amorphous silica alumina), with the aim of combining lignin depolymerization and HDO in a single reaction step. While the silica-supported catalysts were themselves hardly active in lignin upgrading, Ni/ASA displayed comparable lignin monomer yield as CuMgAlOx. A drawback of using an acidic support is extensive dehydration of the ethanol solvent. Instead, combining CuMgAlOx with Ni/SiO2 and especially Ni2P/SiO2 proved to be effective in increasing the lignin monomer yield, while at the same time reducing the oxygen content of the products. With Ni2P/SiO2, the lignin monomer yield was 53 wt %, leading to nearly complete deoxygenation of the aromatic products.
Original languageEnglish
Pages (from-to)3535–3543
Number of pages9
JournalACS Sustainable Chemistry & Engineering
Volume5
Issue number4
DOIs
Publication statusPublished - Apr 2017

Keywords

  • Aromatics
  • Hydrodeoxygenation
  • Lignin
  • Ni P
  • Supercritical ethanol

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