Development of a kinetic model based on experimental investigations of the thermochemical reduction/oxidation of iron oxide/iron

In this project, the kinetics of the stepwise thermochemical reduction and oxidation of iron oxides and iron will be experimentally investigated. For a detailed description of reduction and oxidation kinetics, several phases and phase boundaries as well as different iron oxide species need to be considered.

Based on thermogravimetric analysis and flow reactor experiments of the reduction and oxidation process a kinetic model will be developed to describe the chemical conversion in different phases and at the phase boundaries. For a detailed description of the kinetic model, ex-situ solid-state and surface analyses are required for detailed information on the states of the occurring iron oxides as well as the change in particle characteristics.

For description of the reaction mechanisms an elementary kinetic approach is adopted, where the heterogeneous reactions are based on the mean-field approximation. The developed reaction mechanisms with the associated kinetic and thermodynamic data will be integrated into computer programs for the numerical simulation of the processes using the software packages DETCHEMTM and CaRMeN.

Scientific questions:

  • What is the influence of different conditions (e.g. gas concentration, temperature, particle size) on the reduction/oxidation process?
  • Which are the elementary steps of the reduction/oxidation mechanisms?
  • Which are the kinetic parameters for description of the reduction/oxidation process?

Team

Karlsruhe Institute of Technology (KIT)

Contact

work +49 721 608-43064

Work Engesserstraße 18/20
76128 Karlsruhe

Karlsruher Institut für Technologie (KIT)
Institut für Technische Chemie und Polymerchemie

Contact

work +49 721 608-43191

Work 11.21
Engesserstr. 20
76131 Karlsruhe