Fast pyrolysis of glucose-based carbohydrates with added NaCl part 1: Experiments and development of a mechanistic model

Xiaowei Zhou, Heather B. Mayes, Linda J. Broadbelt, Michael W. Nolte, Brent H. Shanks*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

Sodium ions, one of the natural inorganic constituents in lignocellulosic biomass, significantly alter pyrolysis behavior and resulting chemical speciation. Here, experiments were conducted using a micropyrolyzer to investigate the catalytic effects of NaCl on fast pyrolysis of glucose-based carbohydrates (glucose, cellobiose, maltohexaose, and cellulose), and on a major product of cellulose pyrolysis, levoglucosan (LVG). A mechanistic model that addressed the significant catalytic effects of NaCl on the product distribution was developed. The model incorporated interactions of Na+ with cellulosic chains and low molecular weight species, reactions mediated by Na+ including dehydration, cyclic/Grob fragmentation, ring-opening/closing, isomerization, and char formation, and a degradation network of LVG in the presence of Na+. Rate coefficients of elementary steps were specified based on Arrhenius parameters. The mechanistic model for cellulose included 768 reactions of 222 species, which included 252 reactions of 150 species comprising the mechanistic model of glucose decomposition in the presence of NaCl.

Original languageEnglish (US)
Pages (from-to)766-777
Number of pages12
JournalAIChE Journal
Volume62
Issue number3
DOIs
StatePublished - Mar 1 2016

Keywords

  • Fast pyrolysis
  • Kinetics
  • Mechanistic modeling
  • Reaction mechanism
  • Sodium chloride

ASJC Scopus subject areas

  • Biotechnology
  • Environmental Engineering
  • Chemical Engineering(all)

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