Degradation of cellulose polymorphs into glucose by HCl gas with simultaneous suppression of oxidative discoloration

Yingfeng Wang, Timo Pääkkönen*, Kim Miikki, Ndegwa Henry Maina, Kaarlo Nieminen, Aleksi Zitting, Paavo Penttilä, Han Tao, Eero Kontturi*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)
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Abstract

As cellulose is the main polysaccharide in biomass, its degradation into glucose is a major undertaking in research concerning biofuels and bio-based platform chemicals. Here, we show that pressurized HCl gas is able to efficiently hydrolyze fibers of different crystalline forms (polymorphs) of cellulose when the water content of the fibers is increased to 30–50 wt%. Simultaneously, the harmful formation of strongly chromophoric humins can be suppressed by a simple addition of chlorite into the reaction system. 50–70 % glucose yields were obtained from cellulose I and II polymorphs while >90 % monosaccharide conversion was acquired from cellulose IIIII after a mild post-hydrolysis step. Purification of the products is relatively unproblematic from a gas-solid mixture, and a gaseous catalyst is easier to recycle than the aqueous counterpart. The results lay down a basis for future practical solutions in cellulose hydrolysis where side reactions are controlled, conversion rates are efficient, and the recovery of products and reagents is effortless.
Original languageEnglish
Article number120388
Number of pages9
JournalCarbohydrate Polymers
Volume302
Early online date1 Dec 2022
DOIs
Publication statusE-pub ahead of print - 1 Dec 2022
MoE publication typeA1 Journal article-refereed

Keywords

  • Acid hydrolysis
  • Biomass conversion
  • Cellulose crystal
  • Cellulose microfibril
  • Gas-solid reactions
  • Humins

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