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Abstract
AbstractWe have investigated a series of supported and unsupported nickel and cobalt catalysts, principally using neutron vibrational spectroscopy (inelastic neutron scattering, INS). For an alumina supported Ni catalyst we are able to detect hydrogen on the metal for the first time, all previous work has used Raney Ni. For an unsupported Ni foam catalyst, which has similar behaviour to Raney Ni but with a much lower density, the spectra show that there are approximately equal numbers of (100) and (111) sites, in contrast to Raney Ni that shows largely (111) sites. The observation of hydrogen on cobalt catalysts proved to be extremely challenging. In order to generate a cobalt metal surface, reduction in hydrogen at 250–300 °C is required. Lower temperatures result in a largely hydroxylated surface. The spectra show that on Raney Co (and probably also on a Co foam catalyst), hydrogen occupies a threefold hollow site, similar to that found on Co($$10\bar{1}0$$
10
1
¯
0
). The reduced surface is highly reactive: transfers between cells in a high quality glovebox were sufficient to re-hydroxylate the surface.
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Parker SF, Robertson SJ, Imberti S. Structure and spectroscopy of the supercapacitor material hydrous ruthenium oxide, RuO2·xH2o, by neutron scattering*. Mol Phys 2019. [DOI: 10.1080/00268976.2019.1649491] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
| | | | - Silvia Imberti
- ISIS Facility, STFC Rutherford Appleton Laboratory, Didcot, UK
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Schliesser JM, Huang B, Sahu SK, Asplund M, Navrotsky A, Woodfield BF. Experimental heat capacities, excess entropies, and magnetic properties of bulk and nano Fe3O4-Co3O4 and Fe3O4-Mn3O4 spinel solid solutions. J SOLID STATE CHEM 2018. [DOI: 10.1016/j.jssc.2018.01.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Bennett E, Wilson T, Murphy PJ, Refson K, Hannon AC, Imberti S, Callear SK, Chass GA, Parker SF. How the Surface Structure Determines the Properties of CuH. Inorg Chem 2015; 54:2213-20. [DOI: 10.1021/ic5027009] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Elliot Bennett
- School of Chemistry, Bangor University, Bangor LL57 2UW, U.K
| | - Thomas Wilson
- School of Chemistry, Bangor University, Bangor LL57 2UW, U.K
| | | | | | | | | | | | - Gregory A. Chass
- School of Biological and Chemical Sciences, Queen Mary University of London, London E1 4NS, U.K
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