Mechanism of Brønsted Acid-Catalyzed Glucose Dehydration

Liu Yang, George Tsilomelekis, Stavros Caratzoulas, Dionisios G. Vlachos

Research output: Contribution to journalArticle

62 Scopus citations

Abstract

We present the first DFT-based microkinetic model for the Brønsted acid-catalyzed conversion of glucose to 5-hydroxylmethylfurfural (HMF), levulinic acid (LA), and formic acid (FA) and perform kinetic and isotopic tracing NMR spectroscopy mainly at low conversions. We reveal that glucose dehydrates through a cyclic path. Our modeling results are in excellent agreement with kinetic data and indicate that the rate-limiting step is the first dehydration of protonated glucose and that the majority of glucose is consumed through the HMF intermediate. We introduce a combination of 1) automatic mechanism generation with isotopic tracing experiments and 2) elementary reaction flux analysis of important paths with NMR spectroscopy and kinetic experiments to assess mechanisms. We find that the excess formic acid, which appears at high temperatures and glucose conversions, originates from retro-aldol chemistry that involves the C6 carbon atom of glucose.

Original languageEnglish (US)
Pages (from-to)1334-1341
Number of pages8
JournalChemSusChem
Volume8
Issue number8
DOIs
StatePublished - Apr 24 2015
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Chemical Engineering(all)
  • Materials Science(all)
  • Energy(all)

Keywords

  • NMR spectroscopy
  • ab initio calculations
  • isotopic labeling
  • kinetics
  • reaction mechanisms

Fingerprint Dive into the research topics of 'Mechanism of Brønsted Acid-Catalyzed Glucose Dehydration'. Together they form a unique fingerprint.

  • Cite this