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Title: A kinetic study of the fast micro-pyrolysis of hybrid poplar

Abstract

Here, hybrid poplar from the clone DN34 was studied to determine the rate of production of bio-oil species with respect to time during the fast pyrolysis process. 300–660 ug samples were pyrolyzed using a micropyrolzer at 500 °C at very high heating rates and very short vapor residence times. Individual poplar samples were run in triplicate at discrete time points ranging from 1 to 20 s in the micropyrolzer. Several bio-oil compounds from each individual sample were analyzed using GC/MS. Select bio-oil compounds, derived from the hemicellulose, cellulose, and lignin fractions of the wood, were used to determine their rates of production from thermal degradation of the biomass. These rates were quantified using standards to determine the weight percent relative to the original raw biomass with respect to time. Pyrolysis kinetic reaction models were fit to this experimental data in order to determine suitability of each model. A first order exponential decay model for degradation of the solid biomass was fit against the data along with a six-step consecutive degradation model previously developed by our group. The experimental data suggests that compounds derived from the hemicellulose are produced at faster rates than that of the lignin or cellulose fractions ofmore » the wood, consistent with prior data from thermogravimetric analysis (TGA). When applying the first order exponential decay model, the reaction rates calculated did prove that holocellulose compounds reaction rates were approximately twice that of the lignin compounds reaction rate but did not provide the best fit. The six-step degradation model provided a better fit to all of the biooil compounds and char data, and the stoichiometric parameters derived from the model fit showed that the first three reactions involved mostly the hemicellulose derived compounds while reaction steps 4–6 released cellulose- and lignin-derived compounds.« less

Authors:
 [1];  [2];  [3];  [4]
  1. Michigan Technological Univ., Houghton, MI (United States). Dept. of Chemical Engineering
  2. Idaho National Lab. (INL), Idaho Falls, ID (United States)
  3. Michigan Technological Univ., Houghton, MI (United States). Dept. of Mechanical Engineering
  4. Michigan Technological Univ., Houghton, MI (United States). Dept. of Chemical Engineering and Sustainable Futures Inst.
Publication Date:
Research Org.:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE); National Science Foundation (NSF)
OSTI Identifier:
1411729
Report Number(s):
[INL/JOU-16-40527]
[Journal ID: ISSN 0165-2370; PII: S0165237017300840]
Grant/Contract Number:  
[AC07-05ID14517; MSP/CHE-ENG/ECCS-1230803]
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Analytical and Applied Pyrolysis
Additional Journal Information:
[ Journal Volume: 128; Journal Issue: C]; Journal ID: ISSN 0165-2370
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Hybrid Poplar; Micro-pyrolysis; Pyrolysis Kinetics; Biomass Degradation; Kinetic Modeling; Thermal Degradation; Bio-oil Production

Citation Formats

Klemetsrud, Bethany, Klinger, Jordan, Bar Ziv, Ezra, and Shonnard, David. A kinetic study of the fast micro-pyrolysis of hybrid poplar. United States: N. p., 2017. Web. doi:10.1016/j.jaap.2017.09.014.
Klemetsrud, Bethany, Klinger, Jordan, Bar Ziv, Ezra, & Shonnard, David. A kinetic study of the fast micro-pyrolysis of hybrid poplar. United States. doi:10.1016/j.jaap.2017.09.014.
Klemetsrud, Bethany, Klinger, Jordan, Bar Ziv, Ezra, and Shonnard, David. Fri . "A kinetic study of the fast micro-pyrolysis of hybrid poplar". United States. doi:10.1016/j.jaap.2017.09.014. https://www.osti.gov/servlets/purl/1411729.
@article{osti_1411729,
title = {A kinetic study of the fast micro-pyrolysis of hybrid poplar},
author = {Klemetsrud, Bethany and Klinger, Jordan and Bar Ziv, Ezra and Shonnard, David},
abstractNote = {Here, hybrid poplar from the clone DN34 was studied to determine the rate of production of bio-oil species with respect to time during the fast pyrolysis process. 300–660 ug samples were pyrolyzed using a micropyrolzer at 500 °C at very high heating rates and very short vapor residence times. Individual poplar samples were run in triplicate at discrete time points ranging from 1 to 20 s in the micropyrolzer. Several bio-oil compounds from each individual sample were analyzed using GC/MS. Select bio-oil compounds, derived from the hemicellulose, cellulose, and lignin fractions of the wood, were used to determine their rates of production from thermal degradation of the biomass. These rates were quantified using standards to determine the weight percent relative to the original raw biomass with respect to time. Pyrolysis kinetic reaction models were fit to this experimental data in order to determine suitability of each model. A first order exponential decay model for degradation of the solid biomass was fit against the data along with a six-step consecutive degradation model previously developed by our group. The experimental data suggests that compounds derived from the hemicellulose are produced at faster rates than that of the lignin or cellulose fractions of the wood, consistent with prior data from thermogravimetric analysis (TGA). When applying the first order exponential decay model, the reaction rates calculated did prove that holocellulose compounds reaction rates were approximately twice that of the lignin compounds reaction rate but did not provide the best fit. The six-step degradation model provided a better fit to all of the biooil compounds and char data, and the stoichiometric parameters derived from the model fit showed that the first three reactions involved mostly the hemicellulose derived compounds while reaction steps 4–6 released cellulose- and lignin-derived compounds.},
doi = {10.1016/j.jaap.2017.09.014},
journal = {Journal of Analytical and Applied Pyrolysis},
number = [C],
volume = [128],
place = {United States},
year = {2017},
month = {9}
}

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