Diffuse Reflectance Infrared Fourier Transform Spectroscopic Studies of the Adsorption of Oleate/Oleic Acid onto Zirconia

Langmuir ◽  
1996 ◽  
Vol 12 (26) ◽  
pp. 6487-6491 ◽  
Author(s):  
P. J. Thistlethwaite ◽  
M. L. Gee ◽  
D. Wilson
Keyword(s):  
Fourier Transform ◽  
Oleic Acid ◽  
Diffuse Reflectance ◽  
Spectroscopic Studies ◽  
Diffuse Reflectance Infrared

Diffuse Reflectance Infrared Fourier Transform and Raman Spectroscopic Studies of MoO3Dispersed on CeO2Support

Langmuir ◽  
1999 ◽  
Vol 15 (5) ◽  
pp. 1693-1697 ◽  
Author(s):  
Xuezhong Du ◽  
Lin Dong ◽  
Chun Li ◽  
Yingqiu Liang ◽  
Yi Chen
Keyword(s):  
Fourier Transform ◽  
Diffuse Reflectance ◽  
Spectroscopic Studies ◽  
Raman Spectroscopic ◽  
Diffuse Reflectance Infrared

Diffuse Reflectance Infrared Fourier Transform (DRIFT) Spectroscopic Studies of Coals: in situ Studies of Acetylation

1987 ◽  
Vol 41 (6) ◽  
pp. 1023-1028 ◽  
Author(s):  
N. R. Smyrl ◽  
E. L. Fuller
Keyword(s):  
Fourier Transform ◽  
Functional Groups ◽  
Diffuse Reflectance ◽  
Spectroscopic Studies ◽  
Drift Spectroscopy ◽  
Entire Study ◽  
Oak Ridge ◽  
Powdered Coal ◽  
Diffuse Reflectance Infrared

Diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy has been utilized to monitor the in situ acetylation of a powdered subbituminous coal at the Oak Ridge Y-12 Plant. The acetylation reaction was carried out by the adsorption of acetic anhydride onto the powdered coal from the gas phase with subsequent heating above 100°C required to initiate the reaction. This technique can be used to gain insight into the hydroxyl (O-H) content of the specific coal sample under study by simultaneous observation of the disappearance of infrared absorptions due to various types of O-H functional groups and of the appearance of absorptions due to carbonyl functional groups resulting from reaction with the anhydride. This entire study can be carried out on a single sample without any intervening sample handling or the introduction of extraneous parameters that could alter the results.

scholarly journals Changes of Pd Oxidation State in Pd/Al2O3 Catalysts Using Modulated Excitation DRIFTS

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 116
Author(s):  
Gian Luca Chiarello ◽  
Ye Lu ◽  
Miren Agote-Arán ◽  
Riccardo Pellegrini ◽  
Davide Ferri
Keyword(s):  
Particle Size ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Oxidation State ◽  
Diffuse Reflectance ◽  
X Ray ◽  
Spectral Changes ◽  
Diffuse Reflectance Infrared ◽  
X Ray Absorption ◽  
Reversible Reduction

Infrared spectroscopy is typically not used to establish the oxidation state of metal-based catalysts. In this work, we show that the baseline of spectra collected in diffuse reflectance mode of a series of Pd/Al2O3 samples of increasing Pd content varies significantly and reversibly under alternate pulses of CO or H2 and O2. Moreover, these baseline changes are proportional to the Pd content in Pd/Al2O3 samples exhibiting comparable Pd particle size. Similar measurements by X-ray absorption spectroscopy on a different 2 wt.% Pd/Al2O3 confirm that the baseline changes reflect the reversible reduction-oxidation of Pd. Hence, we demonstrate that changes in oxidation state of metal-based catalysts can be determined using diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and that this behavior is part of the spectral changes that are returned by experiments under operando conditions.

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