ATR-IR Flow-Through Cell for Concentration Modulation Excitation Spectroscopy:  Diffusion Experiments and Simulations

2003 ◽  
Vol 107 (47) ◽  
pp. 13061-13068 ◽  
Author(s):  
Atsushi Urakawa ◽  
Ronny Wirz ◽  
Thomas Bürgi ◽  
Alfons Baiker
Keyword(s):  
Flow Through ◽  
Modulation Excitation Spectroscopy ◽  
Modulation Excitation

scholarly journals CO2 Methanation over Rh/CeO2 Studied with Infrared Modulation Excitation Spectroscopy and Phase Sensitive Detection

Catalysts ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 601
Author(s):  
Felix Hemmingsson ◽  
Andreas Schaefer ◽  
Magnus Skoglundh ◽  
Per-Anders Carlsson
Keyword(s):  
Reaction Pathway ◽  
Sensitive Detection ◽  
Side Reactions ◽  
Co2 Methanation ◽  
Individual Contributions ◽  
Phase Sensitive ◽  
Phase Sensitive Detection ◽  
Modulation Excitation Spectroscopy ◽  
Modulation Excitation

Methane is a well-established fuel molecule whose production from CO 2 through methanation garners increasing interest as an energy storage solution. While often produced with Ni based catalysts, other metals are of interest thanks to higher robustness and activity-selectivity numbers. The Rh/CeO 2 catalyst has shown appreciable properties for CO 2 methanation and its structural dynamics has been studied in situ. However, the reaction pathway is unknown. Here, we present infrared modulation excitation spectroscopy measurements with phase sensitive detection of a Rh/CeO 2 catalyst adsorbate composition during H 2 pulsing (0–2 vol.%) to a constant CO 2 (0.5 vol.%) feed. Various carbonyl (CO) and carbonate (b-CO 3 /p-CO 3 ) ad-species clearly respond to the hydrogen stimulus, making them potential reaction intermediates. The different CO ad-species are likely intermediates for product CO and CH 4 but their individual contributions to the respective formations are not unambiguously ascertained. As for the carbonate dynamics, it might be linked to the reduction/oxidation of the CeO 2 surface upon H 2 pulsing. Formate (HCOO) ad-species are clearly visible but appear to be, if not spectators, linked to slow side reactions possibly also affected by CeO 2 redox processes.

First steps in combining modulation excitation spectroscopy with synchronous dispersive EXAFS/DRIFTS/mass spectrometry for in situ time resolved study of heterogeneous catalysts

2010 ◽  
Vol 12 (21) ◽  
pp. 5634 ◽  
Author(s):  
Davide Ferri ◽  
M. Santosh Kumar ◽  
Ronny Wirz ◽  
Arnim Eyssler ◽  
Oxana Korsak ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Heterogeneous Catalysts ◽  
Time Resolved ◽  
Modulation Excitation Spectroscopy ◽  
Modulation Excitation

scholarly journals Improving the sensitivity of QEXAFS using modulation excitation spectroscopy

2013 ◽  
Vol 430 ◽  
pp. 012126 ◽  
Author(s):  
J Stötzel ◽  
D Lützenkirchen-Hecht ◽  
R Frahm ◽  
J-D Grunwaldt
Keyword(s):  
Modulation Excitation Spectroscopy ◽  
Modulation Excitation

scholarly journals Modulation excitation spectroscopy adapted to crystallography

2011 ◽  
Vol 67 (a1) ◽  
pp. C582-C583
Author(s):  
R. Caliandro ◽  
W. van Beek ◽  
M. Milanesio ◽  
A. Urakawa ◽  
D. Chernyshov ◽  
...  
Keyword(s):  
Modulation Excitation Spectroscopy ◽  
Modulation Excitation

scholarly journals Probing the Active Sites of MoS2 Based Hydrotreating Catalysts Using Modulation Excitation Spectroscopy

ACS Catalysis ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 2568-2579 ◽  
Author(s):  
Abhijeet Gaur ◽  
Trine Marie Hartmann Dabros ◽  
Martin Høj ◽  
Alexey Boubnov ◽  
Tim Prüssmann ◽  
...  
Keyword(s):  
Active Sites ◽  
Hydrotreating Catalysts ◽  
Modulation Excitation Spectroscopy ◽  
Modulation Excitation

Modulation excitation spectroscopy: A method to determine the symmetry of electronic states

1992 ◽  
Vol 60 (26) ◽  
pp. 3277-3279 ◽  
Author(s):  
G. Armelles ◽  
M. I. Alonso ◽  
P. Castrillo ◽  
P. S. Domínguez
Keyword(s):  
Electronic States ◽  
Modulation Excitation Spectroscopy ◽  
Modulation Excitation
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