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2020 ◽  
Vol 22 (34) ◽  
pp. 18835-18848 ◽  
Author(s):  
Aline Ribeiro Passos ◽  
Camille La Fontaine ◽  
Sandra Helena Pulcinelli ◽  
Celso Valentim Santilli ◽  
Valérie Briois

MCR-ALS analysis of Quick-EXAFS combined to Raman provide insight into activation/reactivity and deactivation of NiCu-catalysts used for Ethanol Steam Reforming.


2019 ◽  
Vol 6 (8) ◽  
pp. 2641-2651 ◽  
Author(s):  
Delphine Vantelon ◽  
Mélanie Davranche ◽  
Rémi Marsac ◽  
Camille La Fontaine ◽  
Hélène Guénet ◽  
...  

We evidenced, singled out and characterized the Fe-phases coexisting in iron–organic matter nanoaggregates, as well as their dynamics of formation during the oxidation/hydrolysis of Fe(ii)-humic acid complexes.


2019 ◽  
Author(s):  
Benjamin Bornmann ◽  
Jonas Kläs ◽  
Oliver Müller ◽  
Dirk Lützenkirchen-Hecht ◽  
Ronald Frahm
Keyword(s):  

2016 ◽  
Vol 712 ◽  
pp. 012149 ◽  
Author(s):  
V Briois ◽  
C La Fontaine ◽  
S Belin ◽  
L Barthe ◽  
Th Moreno ◽  
...  
Keyword(s):  

2016 ◽  
Vol 23 (1) ◽  
pp. 260-266 ◽  
Author(s):  
Oliver Müller ◽  
Maarten Nachtegaal ◽  
Justus Just ◽  
Dirk Lützenkirchen-Hecht ◽  
Ronald Frahm

The quick-EXAFS (QEXAFS) method adds time resolution to X-ray absorption spectroscopy (XAS) and allows dynamic structural changes to be followed. A completely new QEXAFS setup consisting of monochromator, detectors and data acquisition system is presented, as installed at the SuperXAS bending-magnet beamline at the Swiss Light Source (Paul Scherrer Institute, Switzerland). The monochromator uses Si(111) and Si(311) channel-cut crystals mounted on one crystal stage, and remote exchange allows an energy range from 4.0 keV to 32 keV to be covered. The spectral scan range can be electronically adjusted up to several keV to cover multiple absorption edges in one scan. The determination of the Bragg angle close to the position of the crystals allows high-accuracy measurements. Absorption spectra can be acquired with fast gridded ionization chambers at oscillation frequencies of up to 50 Hz resulting in a time resolution of 10 ms, using both scan directions of each oscillation period. The carefully developed low-noise detector system yields high-quality absorption data. The unique setup allows both state-of-the-art QEXAFS and stable step-scan operation without the need to exchange whole monochromators. The long-term stability of the Bragg angle was investigated and absorption spectra of reference materials as well as of a fast chemical reaction demonstrate the overall capabilities of the new setup.


2016 ◽  
Vol 6 (24) ◽  
pp. 8525-8531 ◽  
Author(s):  
Mark A. Newton ◽  
John B. Brazier ◽  
Elena M. Barreiro ◽  
Hermann Emerich ◽  
Luis A. Adrio ◽  
...  

Aqueous ethanolic solvents rearrange Pd catalysts facilely toward a common state irrespective of starting Pd dispersion or support material.


2015 ◽  
Vol 22 (6) ◽  
pp. 1548-1554 ◽  
Author(s):  
O. Mathon ◽  
A. Beteva ◽  
J. Borrel ◽  
D. Bugnazet ◽  
S. Gatla ◽  
...  

BM23 is the general-purpose EXAFS bending-magnet beamline at the ESRF, replacing the former BM29 beamline in the framework of the ESRF upgrade. Its mission is to serve the whole XAS user community by providing access to a basic service in addition to the many specialized instruments available at the ESRF. BM23 offers high signal-to-noise ratio EXAFS in a large energy range (5–75 keV), continuous energy scanning for quick-EXAFS on the second timescale and a micro-XAS station delivering a spot size of 4 µm × 4 µm FWHM. It is a user-friendly facility featuring a high degree of automation, online EXAFS data reduction and a flexible sample environment.


2015 ◽  
Author(s):  
A. K. Poswal ◽  
Ankur Agrawal ◽  
D. Bhattachryya ◽  
S. N. Jha ◽  
N. K. Sahoo

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