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

Ossler, Frederik LU ; Santodonato, Louis J.; Warren, Jeffrey M.; Finney, Charles E.A.; Bilheux, Jean Christophe; Mills, Rebecca A.; Skorpenske, Harley D. and Bilheux, Hassina Z. (2018) In Proceedings of the Combustion Institute2000-01-01+01:00
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... (More)

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. The loss of elemental hydrogen between initial and final states of pyrolysis was estimated to be about 70%.

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author
organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
Biomass, Neutron imaging, Pyrolysis
in
Proceedings of the Combustion Institute2000-01-01+01:00
publisher
Elsevier
external identifiers
  • scopus:85052904613
ISSN
1540-7489
DOI
10.1016/j.proci.2018.07.051
language
English
LU publication?
yes
id
7a0d37d3-0cf4-49e0-a1bb-95aa7c94953c
date added to LUP
2018-10-26 09:04:15
date last changed
2019-01-06 14:12:21
@article{7a0d37d3-0cf4-49e0-a1bb-95aa7c94953c,
  abstract     = {<p>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. The loss of elemental hydrogen between initial and final states of pyrolysis was estimated to be about 70%.</p>},
  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.},
  issn         = {1540-7489},
  keyword      = {Biomass,Neutron imaging,Pyrolysis},
  language     = {eng},
  month        = {09},
  publisher    = {Elsevier},
  series       = {Proceedings of the Combustion Institute2000-01-01+01:00},
  title        = {In situ monitoring of hydrogen loss during pyrolysis of wood by neutron imaging},
  url          = {http://dx.doi.org/10.1016/j.proci.2018.07.051},
  year         = {2018},
}