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Hydrogen adsorption on two catalysts for the ortho- to parahydrogen conversion : Cr-doped silica and ferric oxide gel

Hartl, Monika LU ; Gillis, Robert Chad ; Daemen, Luke ; Olds, Daniel P ; Page, Katherine ; Carlson, Stefan LU ; Cheng, Yongqiang ; Hügle, Thomas ; Iverson, Erik B and Ramirez-Cuesta, A J , et al. (2016) In Physical Chemistry Chemical Physics 18(26). p.17281-17293
Abstract

Molecular hydrogen exists in two spin-rotation coupled states: parahydrogen and orthohydrogen. Due to the variation of energy with rotational level, the occupation of ortho- and parahydrogen states is temperature dependent, with parahydrogen being the dominant species at low temperatures. The equilibrium at 20 K (99.8% parahydrogen) can be reached by natural conversion only after a lengthy process. With the use of a suitable catalyst, this process can be shortened significantly. Two types of commercial catalysts currently being used for ortho- to parahydrogen conversion are: iron(iii) oxide (Fe2O3, IONEX®), and chromium(ii) oxide doped silica catalyst (CrO·SiO2, OXISORB®). We investigate the interaction of ortho- and parahydrogen with... (More)

Molecular hydrogen exists in two spin-rotation coupled states: parahydrogen and orthohydrogen. Due to the variation of energy with rotational level, the occupation of ortho- and parahydrogen states is temperature dependent, with parahydrogen being the dominant species at low temperatures. The equilibrium at 20 K (99.8% parahydrogen) can be reached by natural conversion only after a lengthy process. With the use of a suitable catalyst, this process can be shortened significantly. Two types of commercial catalysts currently being used for ortho- to parahydrogen conversion are: iron(iii) oxide (Fe2O3, IONEX®), and chromium(ii) oxide doped silica catalyst (CrO·SiO2, OXISORB®). We investigate the interaction of ortho- and parahydrogen with the surfaces of these ortho-para conversion catalysts using neutron vibrational spectroscopy. The catalytic surfaces have been characterized using X-ray absorption fine structure (XAFS) and X-ray/neutron pair distribution function measurements.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Chemistry Chemical Physics
volume
18
issue
26
pages
13 pages
publisher
Royal Society of Chemistry
external identifiers
  • scopus:84976877606
  • wos:000379482100018
  • pmid:27149564
ISSN
1463-9084
DOI
10.1039/c6cp01154c
language
English
LU publication?
yes
id
d7842671-8cec-40e4-9573-bb6e9d8e9f0f
date added to LUP
2016-05-09 13:23:21
date last changed
2024-01-18 23:56:57
@article{d7842671-8cec-40e4-9573-bb6e9d8e9f0f,
  abstract     = {{<p>Molecular hydrogen exists in two spin-rotation coupled states: parahydrogen and orthohydrogen. Due to the variation of energy with rotational level, the occupation of ortho- and parahydrogen states is temperature dependent, with parahydrogen being the dominant species at low temperatures. The equilibrium at 20 K (99.8% parahydrogen) can be reached by natural conversion only after a lengthy process. With the use of a suitable catalyst, this process can be shortened significantly. Two types of commercial catalysts currently being used for ortho- to parahydrogen conversion are: iron(iii) oxide (Fe2O3, IONEX®), and chromium(ii) oxide doped silica catalyst (CrO·SiO2, OXISORB®). We investigate the interaction of ortho- and parahydrogen with the surfaces of these ortho-para conversion catalysts using neutron vibrational spectroscopy. The catalytic surfaces have been characterized using X-ray absorption fine structure (XAFS) and X-ray/neutron pair distribution function measurements.</p>}},
  author       = {{Hartl, Monika and Gillis, Robert Chad and Daemen, Luke and Olds, Daniel P and Page, Katherine and Carlson, Stefan and Cheng, Yongqiang and Hügle, Thomas and Iverson, Erik B and Ramirez-Cuesta, A J and Lee, Yong Joong and Muhrer, Günter}},
  issn         = {{1463-9084}},
  language     = {{eng}},
  month        = {{05}},
  number       = {{26}},
  pages        = {{17281--17293}},
  publisher    = {{Royal Society of Chemistry}},
  series       = {{Physical Chemistry Chemical Physics}},
  title        = {{Hydrogen adsorption on two catalysts for the ortho- to parahydrogen conversion : Cr-doped silica and ferric oxide gel}},
  url          = {{http://dx.doi.org/10.1039/c6cp01154c}},
  doi          = {{10.1039/c6cp01154c}},
  volume       = {{18}},
  year         = {{2016}},
}