Infrared spectroscopic study of dimethyl ether carbonylation catalysed by TiO2-supported rhodium carbonyls

2015 ◽  
Vol 5 (2) ◽  
pp. 843-850 ◽  
Author(s):  
G. A. Flores-Escamilla ◽  
J. C. Fierro-Gonzalez
Keyword(s):  
Infrared Spectroscopy ◽  
Spectroscopic Study ◽  
Dimethyl Ether ◽  
Methyl Acetate ◽  
Infrared Spectroscopic Study ◽  
Spectroscopy Data ◽  
Intermediate Species ◽  
Supported Rh Catalyst ◽  
Rh Catalyst

The carbonylation of dimethyl ether to give methyl acetate in the presence of a TiO2-supported Rh catalyst was investigated by in situ infrared spectroscopy. Data indicate intermediate species that are analogous to those observed during methanol carbonylation.

AN INFRARED-SPECTROSCOPIC STUDY OF METHYL IODIDE AND METHYLENE IODIDE ON Ag(111)

2001 ◽  
Vol 08 (03n04) ◽  
pp. 303-312 ◽  
Author(s):  
G. WU ◽  
D. STACCHIOLA ◽  
M. COLLINS ◽  
W. T. TYSOE
Keyword(s):  
Infrared Spectroscopy ◽  
Spectroscopic Study ◽  
Methyl Iodide ◽  
Metastable State ◽  
Infrared Spectroscopic Study ◽  
Random Orientation ◽  
Methylene Iodide ◽  
Bending Mode ◽  
Reflection Absorption Infrared Spectroscopy ◽  
Infrared Data

The adsorption of methylene iodide and methyl iodide is studied on Ag(111) using reflection-absorption infrared spectroscopy. Molecular methylene iodide adsorbs in a random orientation at 80 K and converts into a species with the H–C–H plane adsorbed perpendicular to the surface on heating to 155 K, and also dissociates into iodomethyl species. These undergo further decomposition eventually to form ethylene, although no methylene species are detected on the surface. Methyl iodide forms both multilayers and a metastable state on Ag(111) at 180 K, where the C–I axis of the metastable state is oriented nearly parallel to the surface. Infrared data suggest that the metastable state both desorbs almost simultaneously with the multilayer and converts to adsorbed methyl iodide with the C–I axis oriented nearly perpendicular to the surface. The latter species decomposes into adsorbed methyl fragments and adsorbed iodine where the frequency of the methyl bending mode for CH3(ads) and for CH3I(ads) are identical at 1230 cm -1.

Infrared Spectroscopic Studies of Thin Polyaniline Films

1990 ◽  
Vol 210 ◽  
Author(s):  
Carol Korzeniewski ◽  
David M. Seeger
Keyword(s):  
Spectroscopic Study ◽  
Structural Features ◽  
Spectroscopic Studies ◽  
Infrared Spectroscopic Study ◽  
Infrared Spectroscopic ◽  
Polyaniline Films

AbstractThe electrochemistry of polyaniline depends upon the pH of the deposition solution and the nature of the anion present during deposition. When the pH of the deposition solution is below 1.0, the response is typical of the para-substituted phenyleneamine structure. When the pH of the deposition solution is greater than 1.0, an additional voltammetric wave appears, and the response is a function of the dopant anion. This report presents results of an in situ infrared spectroscopic study aimed at elucidating structural features which determine the anion dependent voltammetric response.

Sign in / Sign up

Export Citation Format

Share Document