Millisecond FT-IR Spectroscopy of Surface Intermediates of C2H4Hydrogenation over Pt/Al2O3Catalyst under Reaction Conditions

2004 ◽  
Vol 108 (6) ◽  
pp. 1805-1808 ◽  
Author(s):  
Moon Kyu Ko ◽  
Heinz Frei
Keyword(s):  
Ir Spectroscopy ◽  
Reaction Conditions ◽  
Surface Intermediates ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

scholarly journals Halloysite Nanotubes Modified by Chitosan as an Efficient and Eco-Friendly Heterogeneous Nanocatalyst for the Synthesis of Heterocyclic Compounds

Proceedings ◽  
2019 ◽  
Vol 41 (1) ◽  
pp. 59
Author(s):  
Diana Fallah Jelodar ◽  
Zoleikha Hajizadeh ◽  
Ali Maleki
Keyword(s):  
Fourier Transform ◽  
Ir Spectroscopy ◽  
Heterocyclic Compounds ◽  
High Efficiency ◽  
Halloysite Nanotubes ◽  
Reaction Conditions ◽  
X Ray ◽  
Recoverable Catalyst ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

In this study, halloysite nanotubes (HNTs) are modified by chitosan as a natural cationic amino polysaccharide. Halloysite nanotubes/chitosan (HNTs/Chit) were characterized by Fourier transform infrared (FT-IR) spectroscopy and energy dispersive X-ray (EDX) analysis. Also, its performance as a heterogeneous catalyst was investigated in the synthesis of pyranopyrazole derivatives. Being a reusable and easily recoverable catalyst, eco-friendliness, high efficiency, and mild reaction conditions are some advantages of the present work.

Experimental and theoretical study of the photochemical and thermal decomposition of maleic and dichloromaleic anhydrides

2002 ◽  
Vol 80 (5) ◽  
pp. 455-461 ◽  
Author(s):  
A Ionescu ◽  
N Piétri ◽  
M Hillebrand ◽  
M Monnier ◽  
J P Aycard
Keyword(s):  
Thermal Decomposition ◽  
Ir Spectroscopy ◽  
Photochemical Reaction ◽  
Theoretical Study ◽  
Thermal Reaction ◽  
Mo Calculations ◽  
Reaction Conditions ◽  
Decomposition Processes ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

The photochemical and thermal behavior of maleic anhydride 1a and dichloromaleic anhydride 1b, in cryogenic matrix were investigated by means of FT-IR spectroscopy. The ketenylcarbenes represent the key intermediate in the decomposition processes of the anhydrides, even if they were not observed experimentally. The yields of the different products depend on the thermal or photochemical reaction conditions. The main photochemical products obtained from 1a were cyclopropenone and acetylene, whereas the major products from 1b were dichlorocyclopropenone and dichloroacetylene, along with small quantities of dichloropropadienone. The thermal reaction leads to dichloro propa dienone, CO, and CO2. MO calculations performed at the HF/6-31G*//HF/6-31G* level support the experimental mechanisms.Key words: photolysis, thermolysis, ab initio calculations, cryogenic matrix, ketenylcarbenes.

Multiscale exploration of hydrocarbons adsorption and hopping through the ZSM-5 channels - from Monte Carlo modelling to experiment

2021 ◽  
Author(s):  
Maciej Strzempek ◽  
Karolina A. Tarach ◽  
Kinga Góra-Marek ◽  
Fernando Rey ◽  
Miguel Palomino ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Ir Spectroscopy ◽  
Aliphatic Hydrocarbons ◽  
Adsorption Studies ◽  
Ft Ir ◽  
Gravimetric Adsorption ◽  
Hydrocarbons Adsorption ◽  
Ft Ir Spectroscopy

Abstract In this article the results of the statistical MC modelling corroborated by the FT-IR spectroscopy and gravimetric adsorption studies of the low aliphatic hydrocarbons in ZSM-5 (Si/Al =28 or...

scholarly journals Vibrational Spectroscopic Investigation of Blood Plasma and Serum by Drop Coating Deposition for Clinical Application

2021 ◽  
Vol 22 (4) ◽  
pp. 2191
Author(s):  
Jing Huang ◽  
Nairveen Ali ◽  
Elsie Quansah ◽  
Shuxia Guo ◽  
Michel Noutsias ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Outer Ring ◽  
Imaging Method ◽  
Fluorescence Lifetime Imaging ◽  
Drying Process ◽  
Vibrational Signal ◽  
Coating Deposition ◽  
Ft Ir ◽  
Sample Droplet ◽  
Ft Ir Spectroscopy

In recent decades, vibrational spectroscopic methods such as Raman and FT-IR spectroscopy are widely applied to investigate plasma and serum samples. These methods are combined with drop coating deposition techniques to pre-concentrate the biomolecules in the dried droplet to improve the detected vibrational signal. However, most often encountered challenge is the inhomogeneous redistribution of biomolecules due to the coffee-ring effect. In this study, the variation in biomolecule distribution within the dried-sample droplet has been investigated using Raman and FT-IR spectroscopy and fluorescence lifetime imaging method. The plasma-sample from healthy donors were investigated to show the spectral differences between the inner and outer-ring region of the dried-sample droplet. Further, the preferred location of deposition of the most abundant protein albumin in the blood during the drying process of the plasma has been illustrated by using deuterated albumin. Subsequently, two patients with different cardiac-related diseases were investigated exemplarily to illustrate the variation in the pattern of plasma and serum biomolecule distribution during the drying process and its impact on patient-stratification. The study shows that a uniform sampling position of the droplet, both at the inner and the outer ring, is necessary for thorough clinical characterization of the patient’s plasma and serum sample using vibrational spectroscopy.

FT-IR Spectroscopy As A Tool For The Study Of Metal Ions/D- Galactose Complexes

1989 ◽  
Author(s):  
Ning Xi ◽  
Shifu Weng ◽  
Jinguang Wu ◽  
Guangxian Xu
Keyword(s):  
Ir Spectroscopy ◽  
Metal Ions ◽  
Ft Ir ◽  
Ft Ir Spectroscopy
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