CO2 methanation mechanism over Ni/Y2O3: An in situ diffuse reflectance infrared Fourier transform spectroscopic study

2021 ◽  
Author(s):  
Hasan Masitah ◽  
Toshiki Asakoshi ◽  
Hiroki Muroyama ◽  
Toshiaki Matsui ◽  
Koichi Eguchi
Keyword(s):  
Fourier Transform ◽  
Reaction Mechanism ◽  
Diffuse Reflectance ◽  
Reaction Pathways ◽  
Ni Catalysts ◽  
Co2 Methanation ◽  
Highly Active ◽  
Diffuse Reflectance Infrared ◽  
Supported Ni

Supported Ni catalysts are active in CO2 methanation. To understand the reaction mechanism is important for the development of highly-active catalysts. In this study, we investigated the reaction pathways of...

scholarly journals Development of a diffuse reflectance infrared fourier transform spectroscopy (DRIFTS) cell for the in situ analysis of co-electrolysis in a solid oxide cell

2015 ◽  
Vol 182 ◽  
pp. 97-111 ◽  
Author(s):  
Denis J. Cumming ◽  
Christopher Tumilson ◽  
S. F. Rebecca Taylor ◽  
Sarayute Chansai ◽  
Ann V. Call ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Diffuse Reflectance ◽  
Fourier Transform Spectroscopy ◽  
Transport Processes ◽  
Solid Oxide ◽  
Electrochemical Measurements ◽  
Ex Situ ◽  
Diffuse Reflectance Infrared ◽  
Solid Oxide Cell

Co-electrolysis of carbon dioxide and steam has been shown to be an efficient way to produce syngas, however further optimisation requires detailed understanding of the complex reactions, transport processes and degradation mechanisms occurring in the solid oxide cell (SOC) during operation. Whilst electrochemical measurements are currently conducted in situ, many analytical techniques can only be used ex situ and may even be destructive to the cell (e.g. SEM imaging of the microstructure). In order to fully understand and characterise co-electrolysis, in situ monitoring of the reactants, products and SOC is necessary. Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) is ideal for in situ monitoring of co-electrolysis as both gaseous and adsorbed CO and CO2 species can be detected, however it has previously not been used for this purpose. The challenges of designing an experimental rig which allows optical access alongside electrochemical measurements at high temperature and operates in a dual atmosphere are discussed. The rig developed has thus far been used for symmetric cell testing at temperatures from 450 °C to 600 °C. Under a CO atmosphere, significant changes in spectra were observed even over a simple Au|10Sc1CeSZ|Au SOC. The changes relate to a combination of CO oxidation, the water gas shift reaction, carbonate formation and decomposition processes, with the dominant process being both potential and temperature dependent.

Temperature control in DRIFT cells used for in situ and operando studies: where do we stand today?

2020 ◽  
Vol 22 (45) ◽  
pp. 26088-26092
Author(s):  
Ignacio Melián-Cabrera
Keyword(s):  
Heat Transfer ◽  
Fourier Transform ◽  
Temperature Control ◽  
Diffuse Reflectance ◽  
Fourier Transform Spectroscopy ◽  
Diffuse Reflectance Infrared ◽  
Operando Studies

Heat transfer limitations in diffuse-reflectance-infrared-Fourier-transform-spectroscopy cells, which can affect the measurement in spectrokinetic studies, have been appraised.

scholarly journals Promoting effect of Fe on supported Ni catalysts in CO2 methanation by in situ DRIFTS and DFT study

2020 ◽  
Vol 392 ◽  
pp. 266-277 ◽  
Author(s):  
Huong Lan Huynh ◽  
Jie Zhu ◽  
Guanghui Zhang ◽  
Yongli Shen ◽  
Wakshum Mekonnen Tucho ◽  
...  
Keyword(s):  
Dft Study ◽  
Promoting Effect ◽  
Ni Catalysts ◽  
Co2 Methanation ◽  
In Situ Drifts ◽  
Supported Ni Catalysts ◽  
Supported Ni
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