In Situ Real-Time Diffuse Reflection Infrared Fourier Transform Spectroscopy (DRIFTS) Study of Hydrogen Adsorption and Desorption on Ir/SiO2 Catalyst

2012 ◽  
Vol 66 (5) ◽  
pp. 600-605 ◽  
Author(s):  
Gengshen Hu ◽  
Lin Zhu ◽  
Aiping Jia ◽  
Xin Hu ◽  
Guanqun Xie ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Noble Metals ◽  
Diffuse Reflection ◽  
Catalytic Mechanism ◽  
Hydrogen Adsorption ◽  
Fourier Transform Spectroscopy ◽  
Surface Species ◽  
Adsorption And Desorption ◽  
Heterogeneous Catalytic

The adsorption and desorption of hydrogen on Ir/SiO2 catalyst were studied by using in situ diffuse reflection infrared Fourier transform spectroscopy (DRIFTS) combined with curve-fitting analysis. The results indicate that there are three different surface species formed on the catalyst that correspond to the peaks at 1950, 2010, and 2035 cm−1, respectively, when exposed in H2 flow at 130 °C. These surface species display different adsorption and desorption trends. Surface hydride forms after the catalyst is cooled to 80 °C and it disappears after the catalyst is heated to 130 °C again. This study may help us understand the interaction between hydrogen and noble metals and thus give more insights to heterogeneous catalytic mechanism involving hydrogen and hydrogen storage using metal materials.

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.

Surface species during ALD of platinum observed with in situ reflection IR spectroscopy

2018 ◽  
Vol 20 (39) ◽  
pp. 25343-25356 ◽  
Author(s):  
Michiel Van Daele ◽  
Christophe Detavernier ◽  
Jolien Dendooven
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Ir Spectroscopy ◽  
Atomic Layer Deposition ◽  
Fourier Transform Infrared Spectroscopy ◽  
Atomic Layer ◽  
Surface Species ◽  
Layer Deposition ◽  
Substrate Temperatures

Thermal atomic layer deposition (ALD) and plasma-enhanced ALD (PE-ALD) of Pt, using MeCpPtMe3 as the precursor and O2 gas or O2 plasma as the reactant, are studied with in situ reflection Fourier transform infrared spectroscopy (FTIR) at different substrate temperatures.

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