Kinetics of Ozone Decomposition in Porous In2O3 Monoliths

A1 Journal article (refereed)


Internal Authors/Editors


Publication Details

List of Authors: Danielle Klawinski, Dominik Klaus, Christian Weinberger, Jan-Henrik Smått, Michael Tiemann, Thorsten Wagner
Publisher: Royal Society of Chemistry
Publication year: 2017
Journal: Physical Chemistry Chemical Physics
Volume number: 19
Start page: 10326
End page: 10332
eISSN: 1463-9084


Abstract

The performance of many chemical gas-phase reactions is strongly
influenced by the interaction of reactants with interfaces. Nanoporous
materials, which exhibit pore diameters up to 100 nm and high specific
surface areas, can be utilized to reduce the amount of cost-intensive
materials (e.g. noble metals). However, due to limitations in
material transport and reaction kinetics detailed knowledge of the
diffusion and the kinetics of a chemical reaction is necessary to
improve the performance of chemical processes in industry and research.
To experimentally study the diffusion and reaction kinetics of gaseous
species inside such pores, the chemoresistive behavior of certain metal
oxides such as In2O3 can be utilized. In this work, we present a model system based on hierarchically porous monolithic indium oxide (In2O3)
which allows the determination of kinetic effects by utilizing its gas
transducing properties. The experimental data obtained by electrical
measurements are compared to two diffusion and diffusion–reaction
models. Using these methods, the rate constant of ozone decomposition in
porous In2O3 is
estimated. The results are the basis for a suitable material design for
semiconducting gas sensors, on the nano-, meso- and macroscale, which
helps in understanding the underlying mechanisms of diffusion and
reaction.


Last updated on 2019-13-11 at 06:01