Structural and mechanistic insights into low-temperature CO oxidation over a prototypical high entropy oxide by Cu L-edge operando soft X-ray Absorption Spectroscopy

2021 ◽  
Author(s):  
Paola D'Angelo ◽  
Francesco TAVANI ◽  
Martina Fracchia ◽  
Alessandro Tofoni ◽  
Luca Braglia ◽  
...  
Keyword(s):  
Low Temperature ◽  
Co Oxidation ◽  
Absorption Spectroscopy ◽  
Special Interest ◽  
Multicomponent Systems ◽  
X Ray ◽  
High Entropy ◽  
Low Temperature Co Oxidation ◽  
X Ray Absorption

High entropy oxides (HEOs) are an emerging class of materials constituted by multicomponent systems that are receiving special interest as candidates for obtaining novel and desirable properties. In this study...

scholarly journals Catalytic activity of nanostructured Au: Scale effects versus bimetallic/bifunctional effects in low-temperature CO oxidation on nanoporous Au

2013 ◽  
Vol 4 ◽  
pp. 111-128 ◽  
Author(s):  
Lu-Cun Wang ◽  
Yi Zhong ◽  
Haijun Jin ◽  
Daniel Widmann ◽  
Jörg Weissmüller ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
Co Oxidation ◽  
Surface Area ◽  
Photoelectron Spectroscopy ◽  
Scale Effects ◽  
Structural Parameters ◽  
Kinetic Measurements ◽  
X Ray ◽  
Low Temperature Co Oxidation

The catalytic properties of nanostructured Au and their physical origin were investigated by using the low-temperature CO oxidation as a test reaction. In order to distinguish between structural effects (structure–activity correlations) and bimetallic/bifunctional effects, unsupported nanoporous gold (NPG) samples prepared from different Au alloys (AuAg, AuCu) by selective leaching of a less noble metal (Ag, Cu) were employed, whose structure (surface area, ligament size) as well as their residual amount of the second metal were systematically varied by applying different potentials for dealloying. The structural and chemical properties before and after 1000 min reaction were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The catalytic behavior was evaluated by kinetic measurements in a conventional microreactor and by dynamic measurements in a temporal analysis of products (TAP) reactor. The data reveal a clear influence of the surface contents of residual Ag and Cu species on both O2 activation and catalytic activity, while correlations between activity and structural parameters such as surface area or ligament/crystallite size are less evident. Consequences for the mechanistic understanding and the role of the nanostructure in these NPG catalysts are discussed.

Structural properties of low-temperature grown ZnO thin films determined by X-ray diffraction and X-ray absorption spectroscopy

2011 ◽  
Vol 519 (13) ◽  
pp. 4366-4370 ◽  
Author(s):  
Chung-Jong Yu ◽  
Nark-Eon Sung ◽  
Han-Koo Lee ◽  
Hyun-Joon Shin ◽  
Young-Duck Yun ◽  
...  
Keyword(s):  
Thin Films ◽  
Low Temperature ◽  
Structural Properties ◽  
Absorption Spectroscopy ◽  
Zno Thin Films ◽  
X Ray Diffraction ◽  
X Ray ◽  
X Ray Absorption

X-ray Absorption Spectroscopy of Low Temperature Fuel Cell Catalysts

2004 ◽  
Vol 104 (10) ◽  
pp. 4613-4636 ◽  
Author(s):  
Andrea E. Russell ◽  
Abigail Rose
Keyword(s):  
Fuel Cell ◽  
Low Temperature ◽  
Absorption Spectroscopy ◽  
X Ray ◽  
Fuel Cell Catalysts ◽  
X Ray Absorption

Operando spatially and time-resolved X-ray absorption spectroscopy and infrared thermography during oscillatory CO oxidation

2015 ◽  
Vol 328 ◽  
pp. 216-224 ◽  
Author(s):  
Andreas M. Gänzler ◽  
Maria Casapu ◽  
Alexey Boubnov ◽  
Oliver Müller ◽  
Sabrina Conrad ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Infrared Thermography ◽  
Absorption Spectroscopy ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Absorption

A cell for combined UV-visible and x-ray absorption spectroscopy studies under low-temperature and air exclusion conditions

2002 ◽  
Vol 73 (8) ◽  
pp. 2994-2998 ◽  
Author(s):  
V. S. I. Sprakel ◽  
M. C. Feiters ◽  
R. J. M. Nolte ◽  
P. M. F. M. Hombergen ◽  
A. Groenen ◽  
...  
Keyword(s):  
Low Temperature ◽  
Absorption Spectroscopy ◽  
X Ray ◽  
A Cell ◽  
Uv Visible ◽  
Spectroscopy Studies ◽  
X Ray Absorption
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