FT-IR studies

Kacurakova, M., Capek, P., Sasinkova, V., WeUner, N. Ebringerova, A. (2000). FT-IR study of plant cell wall model compounds pectic polysaccharides and hemicelluloses. Carbohydrate Polymers, Vol. 43,2, (October 2000), pp. (195-203), ISSN 0144-8617... 

Henriques, C., Ribiero, M., Abreu, C. el al. (1998) An FT-IR study of NO adsorption over Cu-exchanged MFI catalysts Effect of Si/Al ratio, copper loading and catalyst pre-treatment, Appl. Catal. B Environ., 16, 79. 

Larrubia, M.A., Ramis, G. and Busca, G. (2000) An FT-IR study of the adsorption of urea and ammonia over V205-Mo03-Ti02 SCR catalysts, Appl. Catal. B, 27, L145. 

Finocchio, E., Daturi, M., Binet, C. et al. (1999) Thermal Evolution of the Adsorbed Methoxy Species on CexZr, x02 Solid Solution Samples A FT-IR study, Catal. Today, 52, 53. 

Haneda, M., Bion, N., Daturi, M. el al. (2002) In situ FT-IR study of the selective reduction of NO with propene over Ga203-Al203, J. Catal., 206, 114. 

These assumptions are partially different from those introduced in our previous model.10 In that work, in fact, in order to simplify the kinetic description, we assumed that all the steps involved in the formation of both the chain growth monomer CH2 and water (i.e., Equations 16.3 and 16.4a to 16.4e) were a series of irreversible and consecutive steps. Under this assumption, it was possible to describe the rate of the overall CO conversion process by means of a single rate equation. Nevertheless, from a physical point of view, this hypothesis implies that the surface concentration of the molecular adsorbed CO is nil, with the rate of formation of this species equal to the rate of consumption. However, recent in situ Fourier transform infrared (FT-IR) studies carried out on the same catalyst adopted in this work, at the typical reaction temperature and in an atmosphere composed by H2 and CO, revealed the presence of a significant amount of molecular CO adsorbed on the catalysts surface.17 For these reasons, in the present work, the hypothesis of the irreversible molecular CO adsorption has been removed. 

A. Badri, C. Binet and J.-C. Lavalley, An FT-IR Study of Surface Ceria Hydroxyl Groups During a Redox Process with H2, J. Chem. Soc. Faraday Trans. 92, 4669-4673 (1996). 

Self-association of the selector and stereoselective yet intercomplex H-bond formation could be identified in an ATR FT-IR study of Akasaka et al. [94] in which... 

Singh, S., Wegmann, J., Albert, K., and Muller, K., Variable temperature FT-IR studies on n-aUcyl modified silicas, J. Phys. Chem. B, 106, 878, 2002. 

FT-IR study revealed that no damage of the Co-POM structure occurred when its TBA-salts dissolved in MeCN were used for the immobilization. As one can judge from Figure 2, the IR spectra after subtraction of the peaks due to NH2-X exhibited the principal stretching modes of the Keggin Co-POM imit (956, 888, 818, 752, 720 cm" ). 

It is important to mention that the catalysis with this modified arylzinc reagent not only leads to improved enantioselectivity (at high product yield), but also that in this process swfestoichiometric quantities of diphenylzinc could be applied. This also meant that now both of the phenyl groups could be activated and transferred to the aldehydes. A reaction profile obtained by FT-IR studies revealed that the modification of the zinc reagent had a significant effect on its reactivity [41]. 

FT-IR Studies of Curing Kinetics and Mechanism of Epoxy Resins. 91... 

A series of papers have rqwrted FT-IR studies of the thermal degradation of polyacrylonitrile 22S-226,227 228, 229, 230>. These FT-IR measurements indicate that the nitrile groups play an important role in the degradation process even in the initial stages and show a steady decrease in nitrile with time both in air and under reduced pressure. These results are contrary to previous dispersive infrared measurements... 

Figure 3.9 shows a schematic representation of the most probable mechanism for CO oxidation over supported Au catalysts. This mechanism was first proposed, and later described in more detail, by Haruta [21, 22] based on structural analyses, kinetic and FT-IR studies it is in line with a Langmuir-Hinshelwood mechanism. A reaction between CO adsorbed on the Au NPs and 02 activated on the support occurs at the junction perimeter between Au and the metal-oxide supports. In this case, hemispherical Au NPs are much more active than spherical NPs (Figure 3.4), owing to the longer junction perimeter around the NPs. 

M. Borkowski, J. R. Ferraro, R. Chiarizia, andD. R. McAlister. Ft-ir study of third phase formation in the U(VI) or Th(IV)/HN03, TBP/alkane systems. Solvent Extr. Ion Exch., 20 313-330, 2002. 

A full discussion of water penetration into micelles is beyond the scope of this chapter. The results described above, and others employing longer chain keto -surfactants in other micelles and bilayers, indicated a trend toward less water penetration to the core of aggregates as the surfactant tail length increased, and as aggregate curvature decreased (bilayer formation). More data from FT-IR studies... 

The use of inverse micelles and microemulsions of AOT in supercritical or near supercritical fluids as extractants for valuable hydrophilic substances such as proteins continues to develop. FT-IR studies of the pressure dependence of the water core structure in various parts of the phase diagrams of such systems have been described (89). 

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