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Pyrolytic sugars from cellulosic biomass.

Najeeb Kuzhiyil1, Dustin Dalluge, Xianglan Bai

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Summary

Infusing mineral acids into biomass enhances sugar production via thermal depolymerization. This method passivates biomass metals and buffers the system, significantly increasing levoglucosan yield.

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Area of Science:

  • Biomass conversion and utilization
  • Thermochemical processing of lignocellulose
  • Carbohydrate chemistry

Background:

  • Cellulose depolymerization via acid or enzymatic hydrolysis is common.
  • Purely thermal depolymerization of cellulose primarily yields levoglucosan (LG).
  • Naturally occurring alkali and alkaline earth metals (AAEMs) in biomass catalyze undesired ring-breaking reactions during pyrolysis.

Purpose of the Study:

  • To enhance sugar yield from biomass through purely thermal depolymerization.
  • To investigate the role of mineral acids in modifying biomass for improved sugar production.
  • To understand the mechanisms by which mineral acids influence cellulose pyrolysis.

Main Methods:

  • Infusion of mineral acids (phosphoric and sulfuric acid) into biomass.
  • Analysis of pyrolysis products to determine sugar and oxygenate yields.
  • Characterization of the interaction between mineral acids and AAEMs in biomass.

Main Results:

  • Infusion of mineral acids significantly increased the yield of sugars from biomass via thermal means.
  • Mineral acids converted AAEMs into thermally stable salts, passivating their catalytic activity.
  • The formation of these salts also buffered the system, favoring glycosidic bond breakage and increasing levoglucosan yield by up to 80%.

Conclusions:

  • Mineral acid infusion is an effective strategy for enhancing sugar production from biomass through thermal depolymerization.
  • Passivation of AAEMs and system buffering are key mechanisms driving the increased levoglucosan yield.
  • This approach offers a promising route to cost-effective sugar production from biomass.