title: Synthesis of Mesoporous Metal Oxides by Structure Replication: Thermal Analysis of Metal Nitrates in Porous Carbon Matrices.
abstract: A variety of metal nitrates were filled into the pores of an ordered mesoporous CMK-3 carbon matrix by solution-based impregnation. Thermal conversion of the metal nitrates into the respective metal oxides, and subsequent removal of the carbon matrix by thermal combustion, provides a versatile means to prepare mesoporous metal oxides (so-called nanocasting). This study aims to monitor the thermally induced processes by thermogravimetric analysis (TGA), coupled with mass ion detection (MS). The highly dispersed metal nitrates in the pores of the carbon matrix tend to react to the respective metal oxides at lower temperature than reported in the literature for pure, i.e., carbon-free, metal nitrates. The subsequent thermal combustion of the CMK-3 carbon matrix also occurs at lower temperature, which is explained by a catalytic effect of the metal oxides present in the pores. This catalytic effect is particularly strong for oxides of redox active metals, such as transition group VII and VIII metals (Mn, Fe, Co, Ni), Cu, and Ce.
authors.affiliation: Department of Chemistry, University of Paderborn, Warburger Str. 100, D-33098 Paderborn,Germany. christian.weinberger@uni-paderborn.de.
authors.forename: Christian
authors.initials: C
authors.lastname: Weinberger
authors.affiliation: Institute of Inorganic and Analytical Chemistry, Justus Liebig University, Heinrich-Buff-Ring 58, D-35392 Giessen, Germany. j-rocky@gmx.de.
authors.forename: Jan
authors.initials: J
authors.lastname: Roggenbuck
authors.affiliation: Institute of Physics, University of Augsburg, Universitätsstraße 1, D-86135 Augsburg, Germany. jan.hanss@netzsch.com.
authors.forename: Jan
authors.initials: J
authors.lastname: Hanss
authors.affiliation: Department of Chemistry, University of Paderborn, Warburger Str. 100, D-33098 Paderborn,Germany. christian.weinberger@uni-paderborn.de.|Institute of Inorganic and Analytical Chemistry, Justus Liebig University, Heinrich-Buff-Ring 58, D-35392 Giessen, Germany. christian.weinberger@uni-paderborn.de.
authors.forename: Michael
authors.initials: M
authors.lastname: Tiemann
keywords: CMK-3; catalysis; mass ion detection; nanocasting; porous carbon; porous metal oxide; thermogravimetric analysis