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

Journal Article · · Physical Chemistry Chemical Physics. PCCP
DOI:https://doi.org/10.1039/c6cp01154c· OSTI ID:1855704
 [1];  [2];  [2];  [2];  [2];  [3];  [2];  [2];  [2];  [2];  [1];  [1]
  1. European Spallation Source, Lund (Sweden)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Lund Univ. (Sweden)
+ Show Author Affiliations
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. Here, 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.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1855704
Alternate ID(s):
OSTI ID: 1324816
Journal Information:
Physical Chemistry Chemical Physics. PCCP, Journal Name: Physical Chemistry Chemical Physics. PCCP Journal Issue: 26 Vol. 18; ISSN 1463-9076
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (11)

Neutron Scattering Investigations of Hydride Species in Heterogeneous Catalysis journal November 2018
Neutron Scattering Investigations of Hydride Species in Heterogeneous Catalysis journal December 2018
Controlling the 3-D morphology of Ni–Fe-based nanocatalysts for the oxygen evolution reaction journal January 2019
Hexagonal strontium ferrite: cationic dye adsorption and antibacterial activity journal February 2019
Selective Separation of MA(III) from Ln(III) by Highly Stable Silica-Polymer-based N-Donor Iso Bu-BTP/SiO 2 - P Adsorbent journal February 2019
Electron asymmetries in the photoionization of chiral molecules: possible astrophysical implications journal January 2018
Infrared spectroscopy in superfluid helium droplets journal December 2018
Quench-rate and size-dependent behaviour in glassy Ge 2 Sb 2 Te 5 models simulated with a machine-learned Gaussian approximation potential journal April 2020
Carbon Dioxide Hydrogenation under Subcritical and Supercritical Conditions in the Presence of 15% Fe/SiO2 Catalyst journal October 2018
Unusual Reversal in Pu and U Extraction in an Ionic Liquid Using Two Tripodal Diglycolamide Ligands: Experimental and DFT Studies text January 2019
Hexagonal strontium ferrite: cationic dye adsorption and antibacterial activity text January 2019

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