Hydrogen adsorption on two catalysts for the ortho- to parahydrogen conversion : Cr-doped silica and ferric oxide gel
(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.
(Less)
- author
- organization
- publishing date
- 2016-05-05
- 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
- 2024-08-23 11:32:27
@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}}, }