Redox-reactive Minerals: Properties, Reactions and Applications in Clean Technologies
This volume is intended to provide a useful reference source and a picture of the present status of the chemistry, geochemistry and mineralogy of redox-reactive materials. Although in this volume some progress has been made in this direction, the aim is by no means achieved, especially with this extremely broad, diverse and vibrant area of research.
Influence of iron oxide structure and size on redox reactivity
Published:January 01, 2017
Corinne Chanéac, Jean-Pierre Jolivet, 2017. "Influence of iron oxide structure and size on redox reactivity", Redox-reactive Minerals: Properties, Reactions and Applications in Clean Technologies, I.A.M. Ahmed, K.A. Hudson-Edwards
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Decreasing the particle size of a solid to the nanoscale has consequences for its crystalline and electronic structures. It also involves a large extension of the surface area, thus modifying its reactivity. This chapter focuses on the effect of particle size on thermodynamic, structural and electronic characteristics and on redox properties. It is commonly accepted that a decrease in particle size increases the reactivity of materials. This is discussed here through the description of three main iron oxide structural groups, namely spinel (magnetite, maghemite), hematite and goethite, which exhibit specific behaviour vs. size effect. The role of structural defects and nanoparticle morphology in terms of reactivity is highlighted.