Search Results

You are looking at 1 - 10 of 14 items for :

  • "kinetic parameters" x
  • Refine by Access: Content accessible to me x
Clear All

both STR and EMR, derive the kinetic parameters on the basis of observed experimental data, and compare the catalytic performance of such systems in terms of substrate conversion and productivity. Kinetic modeling In this section we introduce a kinetic

Open access
Journal of Thermal Analysis and Calorimetry
Authors: Lech Nowicki, Anna Antecka, Tomasz Bedyk, Paweł Stolarek, and Stanisław Ledakowicz

equations and kinetic parameters for different oxidizing agents (O 2 , H 2 O and CO 2 ) were obtained. Kinetic analysis is mainly used as a tool for extracting valuable information about the gasification step from a series of measurements with many data

Open access

complexes in the decreasing order are Cu(II)-2 > Cu(II)-3 > Cu(II)-4 > Cu(II)-1. Table 2 Kinetic parameters of complexes

Open access

Application of thermal analysis in nanotechnology

Carbonization and purification of nc-TiC x in argon atmosphere

Journal of Thermal Analysis and Calorimetry
Authors: A. Biedunkiewicz, U. Gabriel, P. Figiel, and D. Grzesiak

Abstract  

The analysis of purification and carbonization process in argon with use of nc-TiCx/C powder, obtained by sol–gel method, is presented. TG-DSC measurements were carried out under non-isothermal and isothermal conditions. The samples were heated up in series to 1473, 1573, 1673, and 1773 K. For this series description of process kinetics is presented. Four stages of the process have been distinguished. Kinetics was described using Coats-Redfern equation. The kinetic parameters were determined for particular stages. Using obtained kinetic data, the analysis of the process was performed. The α(T) and r(α,T) dependencies on heating rate and temperature were investigated. In order to obtain high carbonization degree and carbide particles of small size, an appropriate temperature and time of process duration have to be determined. Appropriate carbonization and particles size were obtained for series heated up to 1570 K. It has been demonstrated that the oxygen, present at trace level in argon, can react with components of the system in certain range of temperature, influencing the quality of obtained product. The particles have been depicted by TEM method, whereas characterization of structure and particles size was performed by XRD method. MS method was used to determine evolved gaseous products.

Open access

and reaction rate of the second step: 4 The second assumption for model - based analysis : all kinetic parameters like activation energy, pre-exponential factor, order of reaction, and reaction type are assumed constant during the

Open access

decomposition of azo-peroxyesters proceeds in two stages reflected by the two peaks on the TG curves. Methods based on Arrhenius-type kinetic equations are usually used to fit thermogravimetric data and to determine kinetic parameters [ 9 – 13 ]. These methods

Open access

terms of the kinetic parameters acquired by thin-layer chromatographic assay and chemometric tools for comparative analysis of degradation profiles of the drugs. Experimental Chemical Reagents Standard

Open access

as nevirapine metabolized by the CYPs, predominantly CYP3A4 and CYP2B6 [ 16 , 17 ]. Few in vitro studies have assessed K m and V max kinetic parameters of rifampicin in human liver microsomes. RIF-induced CYP3A4 activation and expression

Open access

one crucial kinetic parameter (peak vertical instantaneous loading rate) was higher in shod dogs than in the barefoot controls. The ubiquity of dogs as popular companions comes with serious animal welfare costs as it shows in the vast number of

Open access
Journal of Thermal Analysis and Calorimetry
Authors: D. Wyrzykowski, E. Hebanowska, G. Nowak-Wiczk, M. Makowski, and L. Chmurzyński

the case of complex processes, result in a description incompatible with reality; (ii) attempts to determine kinetic parameters of a reaction, i.e. activation energy, E a , or exponent in the Arrhenius equation (the Friedman or Ozawa

Open access