Effect of Ceria Addition to Na2O-ZrO2 Catalytic Mixtures on Lignin Waste Ex-Situ Pyrolysis

Adam Yeardley, Giuseppe Bagnato, Aimaro Sanna

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Abstract

Waste lignin is a potential source of renewable fuels and other chemical precursors under catalytic pyrolysis. For this purpose, four mixed metal oxide catalytic mixtures (Cat) derived from Na CO , CeO and ZrO were synthesised in varying compositions and utilised in a fixed bed reactor for catalytic vapour upgrading of Etek lignin pyrolysis products at 600 °C. The catalytic mixtures were analysed and characterised using XRD analysis, whilst pyrolysis products were analysed for distribution of products using FTIR, GC-MS and EA. Substantial phenolic content (20 wt%) was obtained when using equimolar catalytic mixture A (Cat_A), however the majority of these phenols were guaiacol derivatives, suggesting the catalytic mixture employed did not favour deep demethoxylation. Despite this, addition of 40-50% ceria to NaZrO resulted in a remarkable reduction of coke to 4 wt%, compared to ~9 wt% of NaZrO . CeO content higher than 50% favoured the increase in conversion of the holo-cellulose fraction, enriching the bio-oil in aldehydes, ketones and cyclopentanones. Of the catalytic mixtures studied, equimolar metal oxides content (Cat_A) appears to showcase the optimal characteristics for phenolics production and coking reduction.
Original languageEnglish
Article number827
Number of pages14
JournalMolecules (Basel, Switzerland)
Volume26
Issue number4
DOIs
Publication statusPublished - 05 Feb 2021

Keywords

  • ZrO2
  • bioethanol waste
  • catalysis
  • ceria
  • lignin
  • metal oxides
  • phenol
  • pyrolysis

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