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Title: In situ monitoring of hydrogen loss during pyrolysis of wood by neutron imaging

Abstract

Hydrogen is an element of fundamental importance for energy but hard to quantify in bulk materials. Neutron radiography was used to map in situ loss of elemental hydrogen from beech tree wood samples during pyrolysis. The samples consisted of three wood cylinders (finished dowel or cut branch) of approximately 1 cm in length. The samples were pyrolyzed under vacuum in a furnace vessel that was placed inside a cold neutron imaging beamline using a temperature ramp of 5 °C/min from ambient up to 400 °C. Neutron radiographs with exposures of 30 s were sequentially recorded with a charge-coupled device over the course of the experiment. Relative absorbance/scattering of the neutron beam by each sample was based on intensity (or brightness) values as a function of pixel position. The much larger neutron cross section for hydrogen compared to carbon and oxygen enables almost direct conversion of neutron attenuation into sample hydrogen content for each time step during the pyrolysis experiment. Target and vessel temperatures were recorded concurrently with collection of the radiographs so that changes could be directly correlated to different states of pyrolysis. The most visible change appeared at the initial phase of the 400 °C plateau as evidenced bymore » strong hydrogen loss and primarily diametric shrinking of the samples. In conclusion, the loss of elemental hydrogen between initial and final states of pyrolysis was estimated to be about 70%.« less

Authors:
 [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [3];  [3];  [3]; ORCiD logo [3]
  1. Lund Univ., Lund (Sweden)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Advanced Research Systems, Macungie, PA (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1524893
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Proceedings of the Combustion Institute
Additional Journal Information:
Journal Volume: 37; Journal Issue: 2; Journal ID: ISSN 1540-7489
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
08 HYDROGEN; 09 BIOMASS FUELS; Neutron imaging; Biomass; Pyrolysis

Citation Formats

Ossler, Frederik, Santodonato, Louis J., Warren, Jeffrey M., Finney, Charles E. A., Bilheux, Jean -Christophe, Mills, Rebecca A., Skorpenske, Harley D., and Bilheux, Hassina Z. In situ monitoring of hydrogen loss during pyrolysis of wood by neutron imaging. United States: N. p., 2018. Web. doi:10.1016/j.proci.2018.07.051.
Ossler, Frederik, Santodonato, Louis J., Warren, Jeffrey M., Finney, Charles E. A., Bilheux, Jean -Christophe, Mills, Rebecca A., Skorpenske, Harley D., & Bilheux, Hassina Z. In situ monitoring of hydrogen loss during pyrolysis of wood by neutron imaging. United States. doi:10.1016/j.proci.2018.07.051.
Ossler, Frederik, Santodonato, Louis J., Warren, Jeffrey M., Finney, Charles E. A., Bilheux, Jean -Christophe, Mills, Rebecca A., Skorpenske, Harley D., and Bilheux, Hassina Z. Fri . "In situ monitoring of hydrogen loss during pyrolysis of wood by neutron imaging". United States. doi:10.1016/j.proci.2018.07.051. https://www.osti.gov/servlets/purl/1524893.
@article{osti_1524893,
title = {In situ monitoring of hydrogen loss during pyrolysis of wood by neutron imaging},
author = {Ossler, Frederik and Santodonato, Louis J. and Warren, Jeffrey M. and Finney, Charles E. A. and Bilheux, Jean -Christophe and Mills, Rebecca A. and Skorpenske, Harley D. and Bilheux, Hassina Z.},
abstractNote = {Hydrogen is an element of fundamental importance for energy but hard to quantify in bulk materials. Neutron radiography was used to map in situ loss of elemental hydrogen from beech tree wood samples during pyrolysis. The samples consisted of three wood cylinders (finished dowel or cut branch) of approximately 1 cm in length. The samples were pyrolyzed under vacuum in a furnace vessel that was placed inside a cold neutron imaging beamline using a temperature ramp of 5 °C/min from ambient up to 400 °C. Neutron radiographs with exposures of 30 s were sequentially recorded with a charge-coupled device over the course of the experiment. Relative absorbance/scattering of the neutron beam by each sample was based on intensity (or brightness) values as a function of pixel position. The much larger neutron cross section for hydrogen compared to carbon and oxygen enables almost direct conversion of neutron attenuation into sample hydrogen content for each time step during the pyrolysis experiment. Target and vessel temperatures were recorded concurrently with collection of the radiographs so that changes could be directly correlated to different states of pyrolysis. The most visible change appeared at the initial phase of the 400 °C plateau as evidenced by strong hydrogen loss and primarily diametric shrinking of the samples. In conclusion, the loss of elemental hydrogen between initial and final states of pyrolysis was estimated to be about 70%.},
doi = {10.1016/j.proci.2018.07.051},
journal = {Proceedings of the Combustion Institute},
number = 2,
volume = 37,
place = {United States},
year = {2018},
month = {9}
}

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