scholarly journals The application of inelastic neutron scattering to explore the significance of a magnetic transition in an iron based Fischer-Tropsch catalyst that is active for the hydrogenation of CO

2015 ◽  
Vol 143 (17) ◽  
pp. 174703 ◽  
Author(s):  
Robbie Warringham ◽  
Andrew R. McFarlane ◽  
Donald A. MacLaren ◽  
Paul B. Webb ◽  
Robert P. Tooze ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Magnetic Transition ◽  
Inelastic Neutron ◽  
Fischer Tropsch ◽  
Iron Based ◽  
Hydrogenation Of Co

scholarly journals Examining the temporal behavior of the hydrocarbonaceous overlayer on an iron based Fischer–Tropsch catalyst

RSC Advances ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 2608-2617 ◽  
Author(s):  
Robbie Warringham ◽  
Alisha L. Davidson ◽  
Paul B. Webb ◽  
Robert P. Tooze ◽  
Russel A. Ewings ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Co Hydrogenation ◽  
Inelastic Neutron Scattering ◽  
Ambient Pressure ◽  
Inelastic Neutron ◽  
Tropsch Synthesis ◽  
Temporal Behavior ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
Iron Based

Inelastic neutron scattering is used to examine an un-promoted iron based Fischer–Tropsch synthesis catalyst exposed to ambient pressure CO hydrogenation at 623 K for defined periods of time-on-stream (3, 6, 12 and 24 h).

scholarly journals The application of inelastic neutron scattering to investigate iron-based Fischer-Tropsch to olefins catalysis

2020 ◽  
Vol 392 ◽  
pp. 197-208
Author(s):  
Alisha L. Davidson ◽  
Emma K. Gibson ◽  
Giannantonio Cibin ◽  
Hendrik van Rensburg ◽  
Stewart F. Parker ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Fischer Tropsch ◽  
Iron Based

s±-like spin resonance in the iron-based nodal superconductor BaFe2(As0.65P0.35)2observed using inelastic neutron scattering

2011 ◽  
Vol 84 (14) ◽  
Author(s):  
Motoyuki Ishikado ◽  
Yuki Nagai ◽  
Katsuaki Kodama ◽  
Ryoichi Kajimoto ◽  
Mitsutaka Nakamura ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Spin Resonance ◽  
Iron Based

Vibrational Analysis of an Industrial Fe-Based Fischer-Tropsch Catalyst Employing Inelastic Neutron Scattering

2013 ◽  
Vol 52 (21) ◽  
pp. 5608-5611 ◽  
Author(s):  
Neil G. Hamilton ◽  
Ian P. Silverwood ◽  
Robbie Warringham ◽  
Josef Kapitán ◽  
Lutz Hecht ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Vibrational Analysis ◽  
Inelastic Neutron ◽  
Fischer Tropsch

scholarly journals An Inelastic Neutron Scattering Investigation of the Temporal Behaviour of the Hydrocarbonaceous Overlayer of a Prototype Fischer-Tropsch to Olefins Catalyst

2021 ◽  
Author(s):  
Alisha L. Davidson ◽  
Paul B. Webb ◽  
Stewart F. Parker ◽  
David Lennon
Keyword(s):  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Ambient Pressure ◽  
Inelastic Neutron ◽  
Ex Situ ◽  
Adsorbed Hydrogen ◽  
Hydrogen Atoms ◽  
Fischer Tropsch ◽  
Temporal Behaviour ◽  
Temperature Programmed Oxidation

AbstractA dual sodium and sulfur promoted haematite, representative of a candidate Fischer-Tropsch to olefins (FTO) catalyst, is prepared and contrasted with the performance of an unpromoted hematite sample in the ambient pressure CO hydrogenation reaction at 623 K as a function of time-on-stream (0–24 h). In-situ post-reaction temperature-programmed oxidation measurements show the carbon evolutionary phase of the catalyst conditioning process to be retarded for the FTO catalyst. Ex-situ inelastic neutron scattering measurements show the promoters perturb the formation of a previously described hydrocarbonaceous overlayer. Specifically, whilst the sp3 hybridised C–H modes of the hydrocarbonaceous overlayer are almost unaffected by the additives, the formation of the overlayer’s sp2 hybridised C–H modes are noticeably impeded. The results are discussed in terms of the Na/S promoters disturbing the formation of an ordered hydrocarbonaceous overlayer that is thought to constrain the supply of adsorbed hydrogen atoms, which favours the formation of unsaturated hydrocarbons associated with the FTO process.

scholarly journals High-energy magnetic excitations from heavy quasiparticles in CeCu2Si2

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Yu Song ◽  
Weiyi Wang ◽  
Chongde Cao ◽  
Zahra Yamani ◽  
Yuanji Xu ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Heavy Fermion ◽  
Inelastic Neutron Scattering ◽  
Random Phase ◽  
Three Dimensional ◽  
High Energy ◽  
Inelastic Neutron ◽  
Magnetic Fluctuations ◽  
Magnetic Excitations ◽  
Iron Based

AbstractMagnetic fluctuations is the leading candidate for pairing in cuprate, iron-based, and heavy fermion superconductors. This view is challenged by the recent discovery of nodeless superconductivity in CeCu2Si2, and calls for a detailed understanding of the corresponding magnetic fluctuations. Here, we mapped out the magnetic excitations in superconducting (S-type) CeCu2Si2 using inelastic neutron scattering, finding a strongly asymmetric dispersion for E ≲ 1.5 meV, which at higher energies evolves into broad columnar magnetic excitations that extend to E ≳ 5 meV. While low-energy magnetic excitations exhibit marked three-dimensional characteristics, the high-energy magnetic excitations in CeCu2Si2 are almost two-dimensional, reminiscent of paramagnons found in cuprate and iron-based superconductors. By comparing our experimental findings with calculations in the random-phase approximation,we find that the magnetic excitations in CeCu2Si2 arise from quasiparticles associated with its heavy electron band, which are also responsible for superconductivity. Our results provide a basis for understanding magnetism and superconductivity in CeCu2Si2, and demonstrate the utility of neutron scattering in probing band renormalization in heavy fermion metals.

Vibrational Analysis of an Industrial Fe-Based Fischer-Tropsch Catalyst Employing Inelastic Neutron Scattering

2013 ◽  
Vol 125 (21) ◽  
pp. 5718-5721 ◽  
Author(s):  
Neil G. Hamilton ◽  
Ian P. Silverwood ◽  
Robbie Warringham ◽  
Josef Kapitán ◽  
Lutz Hecht ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Vibrational Analysis ◽  
Inelastic Neutron ◽  
Fischer Tropsch

scholarly journals Incommensurate magnetic ordering and magnetoelectric coupling of BiFeO3

2014 ◽  
Vol 70 (a1) ◽  
pp. C390-C390
Author(s):  
Je-Geun Park
Keyword(s):  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Magnetic Transition ◽  
Magnetic Ordering ◽  
Inelastic Neutron ◽  
Magnetoelectric Coupling ◽  
The Other ◽  
Scattering Data ◽  
Spin Hamiltonian ◽  
Key Questions

BiFeO3 is arguably one of the most interesting multiferroic materials with both ferroelectric and magnetic transition above room temperature. Moreover, it has one of the highest polarization values, near 90 microC/cm2. The other interest lies in the cycloid magnetic structure with an unusually long-period of 620 Å. One of the key questions when it comes to the fundamental understanding of BiFeO3 is how the structure evolves as a function of temperature, especially across the cycloid transition, and whether there is any structural evidence of the most sought-after magnetoelectric coupling. The other principal question concerns with a full spin Hamiltonian necessary to describe the cycloid structure and the other fascinating physical properties. In order to answer these two questions, we have carried out high-resolution structural and dynamics studies using both neutron and synchrotron facilities on powder and single crystal samples. In this talk, we will highlight the structural evidence of the magnetoelectric coupling and high-field quenching of the cycloid above 20 Tesla from high-precision neutron scattering studies [1a,b,c]. We will also present inelastic neutron scattering data, from which we succeeded in establishing the full spin Hamiltonian [2-3].

scholarly journals The application of inelastic neutron scattering to investigate CO hydrogenation over an iron Fischer–Tropsch synthesis catalyst

2014 ◽  
Vol 312 ◽  
pp. 221-231 ◽  
Author(s):  
Neil G. Hamilton ◽  
Robbie Warringham ◽  
Ian P. Silverwood ◽  
Josef Kapitán ◽  
Lutz Hecht ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Co Hydrogenation ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Tropsch Synthesis ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis
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