Determination of the Acidity of High Surface AlF3by IR Spectroscopy of Adsorbed CO Probe Molecules

2007 ◽  
Vol 111 (49) ◽  
pp. 18317-18325 ◽  
Author(s):  
Thoralf Krahl ◽  
Alexandre Vimont ◽  
Gehan Eltanany ◽  
Marco Daturi ◽  
Erhard Kemnitz
Keyword(s):  
Ir Spectroscopy ◽  
High Surface ◽  
Probe Molecules ◽  
Co Probe ◽  
Adsorbed Co

Characterisation of the Ru/MgF2 catalyst with adsorbed O2, NO, CO probe molecules by EPR and IR spectroscopy

2006 ◽  
Vol 67 (7) ◽  
pp. 1387-1393 ◽  
Author(s):  
J. Goslar ◽  
M. Wojciechowska ◽  
M. Zieliński
Keyword(s):  
Ir Spectroscopy ◽  
Probe Molecules ◽  
Co Probe

Determination of Acid Site Location in Dealuminated MCM-68 by 27Al MQMAS NMR and FT-IR Spectroscopy with Probe Molecules

2018 ◽  
Vol 122 (2) ◽  
pp. 1180-1191 ◽  
Author(s):  
Ryoichi Otomo ◽  
Toshiki Nishitoba ◽  
Ryota Osuga ◽  
Yusuke Kunitake ◽  
Yuichi Kamiya ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Acid Site ◽  
Probe Molecules ◽  
Site Location ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Determination of Hydroxy Groups in the Modified Epoxy Oligomers Using IR-Spectroscopy

2015 ◽  
Vol 9 (4) ◽  
pp. 411-416 ◽  
Author(s):  
Ostap Ivashkiv ◽  
◽  
Piotr Bruzdziak ◽  
Olena Shyshchak ◽  
Jacek Namiesnik ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Epoxy Oligomers ◽  
Hydroxy Groups ◽  
Modified Epoxy

Development and Validation of an Eco-Friendly and Low-Cost Method for the Quantification of Cefepime Hydrochloride in Powder for Injectable Solution Using Infrared (IR) Spectroscopy

2020 ◽  
Vol 16 (4) ◽  
pp. 456-464
Author(s):  
Danilo F. Rodrigues ◽  
Hérida R.N. Salgado
Keyword(s):  
Ir Spectroscopy ◽  
Low Cost ◽  
Pharmaceutical Preparations ◽  
Potassium Bromide ◽  
Pharmaceutical Products ◽  
Injectable Formulation ◽  
Ich Guidelines ◽  
Lactam Ring ◽  
Development And Validation

Background: A simple, eco-friendly and low-cost Infrared (IR) method was developed and validated for the analysis of Cefepime Hydrochloride (CEF) in injectable formulation. Different from some other methods, which employ organic solvents in the analyses, this technique does not use these types of solvents, removing large impacts on the environment and risks to operators. Objective: This study aimed at developing and validating a green analytical method using IR spectroscopy for the determination of CEF in pharmaceutical preparations. Methods: The method was validated according to ICH guidelines and the quantification of CEF was performed in the spectral region absorbed at 1815-1745 cm-1 (stretching of the carbonyl group of β- lactam ring). Results: The validated method showed to be linear (r = 0.9999) in the range of 0.2 to 0.6 mg/pellet of potassium bromide, as well as for the parameters of selectivity, precision, accuracy, robustness and Limits of Detection (LOD) and Quantification (LOQ), being able to quantify the CEF in pharmaceutical preparations. The CEF content obtained by the IR method was 103.86%. Conclusion: Thus, the method developed may be an alternative in the quality control of CEF sample in lyophilized powder for injectable solution, as it presented important characteristics in the determination of the pharmaceutical products, with low analysis time and a decrease in the generation of toxic wastes to the environment.

Combination of Sorption Tube Sampling and Thermal Desorption with Hollow Waveguide FT-IR Spectroscopy for Atmospheric Trace Gas Analysis:  Determination of Atmospheric Ethene at the Lower ppb Level

2004 ◽  
Vol 76 (2) ◽  
pp. 464-468 ◽  
Author(s):  
Olga A. Pogodina ◽  
Victor V. Pustogov ◽  
Fabiano de Melas ◽  
Christina Haberhauer-Troyer ◽  
Erwin Rosenberg ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Thermal Desorption ◽  
Gas Analysis ◽  
Trace Gas ◽  
Hollow Waveguide ◽  
Ft Ir ◽  
Atmospheric Trace Gas ◽  
Analysis Determination ◽  
Ft Ir Spectroscopy

scholarly journals The Properties of Cu Ions in Zeolites CuY Studied by IR Spectroscopy

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4686
Author(s):  
Jerzy Podobiński ◽  
Mariusz Gackowski ◽  
Grzegorz Mordarski ◽  
Katarzyna Samson ◽  
Michał Śliwa ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Positive Charge ◽  
Co Adsorption ◽  
The Other ◽  
Probe Molecules ◽  
Adsorption And Desorption ◽  
Other Hand ◽  
Close Proximity ◽  
No And Co Adsorption ◽  
Cu Ions

The properties of both Cu2+ and Cu+ ions in zeolite CuY were followed with NO and CO as probe molecules. Cu2+ was found to be located in SII, SII*, and SIII sites, whereas Cu+ was found in SII and SII* sites. The fine analysis of the spectra of Cu2+-NO and Cu+-CO adducts suggests that both in SII and in SII* sites two kinds of Cu cations exist. They differ in the positive charge, which may be related to the varying numbers of AlO4− in close proximity. The experiments of NO and CO adsorption and desorption evidenced that both Cu2+ and Cu+ sites of highest positive charge bind probe molecules most strongly but activate them to a lesser extent than the Cu sites of lowest positive charge. The experiments of reduction with hydrogen evidenced that the Cu ions of higher positive charge are first reduced by hydrogen. On the other hand, Cu sites of the lowest positive charge are first oxidized by oxygen. The experiments with CuNaY zeolites of various Cu contents suggest that the first introduced Cu (at low Cu contents) created Cu+, which was the most neutralized by framework oxygens. Such Cu cations are the most stabilized by framework oxygens.

Surface characterization of Au/HY by 129XeNMR and diffuse reflectance IR spectroscopy of adsorbed CO. Formation of electron-deficient gold particles inside HY cavities

1997 ◽  
Vol 93 (19) ◽  
pp. 3587-3591 ◽  
Author(s):  
D. Guillemot ◽  
V. Yu. Borovkov ◽  
V. B. Kazansky ◽  
M. Polisset-Thfoin ◽  
J. Fraissard
Keyword(s):  
Ir Spectroscopy ◽  
Surface Characterization ◽  
Diffuse Reflectance ◽  
Gold Particles ◽  
Adsorbed Co

Determination of storage stability of the crude extracts of Ganoderma lucidum using FTIR and 2D-IR spectroscopy

2011 ◽  
Author(s):  
Yew Keong Choong ◽  
Su-Qin Sun ◽  
Qun Zhou ◽  
Zakiah Ismail ◽  
Badrul Amini Abdul Rashid ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Ganoderma Lucidum ◽  
Storage Stability ◽  
2D Ir ◽  
Crude Extracts
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