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Issue 26, 2016
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Hydrogen adsorption on two catalysts for the ortho- to parahydrogen conversion: Cr-doped silica and ferric oxide gel

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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 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.

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

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Publication details

The article was received on 19 Feb 2016, accepted on 28 Apr 2016 and first published on 28 Apr 2016


Article type: Paper
DOI: 10.1039/C6CP01154C
Citation: Phys. Chem. Chem. Phys., 2016,18, 17281-17293

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

    M. Hartl, R. C. Gillis, L. Daemen, D. P. Olds, K. Page, S. Carlson, Y. Cheng, T. Hügle, E. B. Iverson, A. J. Ramirez-Cuesta, Y. Lee and G. Muhrer, Phys. Chem. Chem. Phys., 2016, 18, 17281
    DOI: 10.1039/C6CP01154C

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