High Frequency Phase Sensitive Detection Applied to Helicon Wave Studies

1967 ◽  
Vol 38 (7) ◽  
pp. 895-897 ◽  
Author(s):  
J. W. Hansen ◽  
C. C. Grimes ◽  
A. Libchaber
Keyword(s):  
High Frequency ◽  
Sensitive Detection ◽  
Helicon Wave ◽  
Phase Sensitive ◽  
Phase Sensitive Detection ◽  
Frequency Phase

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.

scholarly journals Phase-Sensitive Detection for Optical Sensing With Porous Silicon

2012 ◽  
Vol 4 (3) ◽  
pp. 986-995 ◽  
Author(s):  
J. Alvarez ◽  
N. Kumar ◽  
P. Bettotti ◽  
D. Hill ◽  
J. Martinez-Pastor
Keyword(s):  
Porous Silicon ◽  
Optical Sensing ◽  
Sensitive Detection ◽  
Phase Sensitive ◽  
Phase Sensitive Detection
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