Arabinose oxidation in a fixed bed of extrudates and solid foams containing gold nanoparticles

Irina L. Simakova, Mouad Hachhach, Atte Aho, Kari Eränen, Johan Wärnå, Tapio Salmi, Dmitry Yu Murzin*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Oxidation of arabinose was investigated in a tandem reactor system comprising a fixed bed of gold catalysts supported on extrudates or solid foams and a stirred tank allowing operation under constant pH of 8. Powder catalyst containing 3 wt% Au deposited on γ-alumina was extruded with γ-alumina and attapulgite or sepiolite as a binder or deposited on the solid open-cell aluminum foam after anodic oxidation pretreatment. Alternatively, deposition precipitation of gold with urea from HAuCl4 precursor was done directly on the extruded support or the solid foam. The presence of gold was essential for catalytic activity which in the applied reactor set-up was strongly limited by mass transfer. Arabinose was rather selectively (ca. 90–95% at full conversion) oxidized to arabinonic acid giving besides arabinolactone other by-products. A mathematical model was developed for the open foam catalyst structures and the extrudates, comprising intrinsic kinetics deduced from batch experiments and the mass transfer within the solid catalyst.

Original languageEnglish
Article number145659
Number of pages12
JournalChemical Engineering Journal
Volume474
DOIs
Publication statusPublished - 15 Oct 2023
MoE publication typeA1 Journal article-refereed

Keywords

  • Aluminum foam
  • Arabinose
  • Extrudates
  • Fixed bed
  • Gold catalysts
  • Kinetic modelling
  • Sugar oxidations

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