Alkaline-Earth-Metal-Catalyzed Thin-Film Pyrolysis of Cellulose

Cheng Zhu, Saurabh Maduskar, Alex D. Paulsen, Paul J. Dauenhauer

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

The conversion of lignocellulosic biomass to "bio-oils" by thermochemical pyrolysis is a promising reactor technology for renewable chemicals and biofuels. Although the fundamental understanding of relevant catalysts within reacting biomass particles is only in its infancy, it is known that inorganic materials naturally present within biomass act as catalysts that limit the yield of bio-oil and alter the product distribution. In this work, the effect of alkaline earth metals on cellulose pyrolysis chemistry was investigated to determine the catalytic effect on primary (transport-free) and secondary (diffusion-limited) reaction pathways. The catalytic materials included homogeneous metal ions Ca2+ and Mg2+ from their inorganic salts, Ca(NO3)2 and Mg(NO3)2, and their corresponding heterogeneous metal oxides, CaO and MgO. Although the oxides had a limited impact on cellulose pyrolysis chemistry, the metal ions altered the secondary reaction pathways of cellulose significantly under diffusion-limited conditions common to lignocellulosic particles within industrial reactors.

Original languageEnglish (US)
Pages (from-to)818-829
Number of pages12
JournalChemCatChem
Volume8
Issue number4
DOIs
StatePublished - Feb 18 2016

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Keywords

  • biomass
  • calcium
  • magnesium
  • reaction mechanisms
  • thin films

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