Synthesis of Mesoporous Metal Oxides by Structure Replication: Thermal Analysis of Metal Nitrates in Porous Carbon MatricesReportar como inadecuado


Synthesis of Mesoporous Metal Oxides by Structure Replication: Thermal Analysis of Metal Nitrates in Porous Carbon Matrices


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1

Department of Chemistry, University of Paderborn, Warburger Str. 100, D-33098 Paderborn,Germany

2

Institute of Inorganic and Analytical Chemistry, Justus Liebig University, Heinrich-Buff-Ring 58, D-35392 Giessen, Germany

3

Institute of Physics, University of Augsburg, Universitätsstraße 1, D-86135 Augsburg, Germany





*

Author to whom correspondence should be addressed.



Academic Editors: Jordi Sort and Eva Pellicer

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. View Full-Text

Keywords: porous carbon; CMK-3; porous metal oxide; thermogravimetric analysis; mass ion detection; nanocasting; catalysis porous carbon; CMK-3; porous metal oxide; thermogravimetric analysis; mass ion detection; nanocasting; catalysis





Autor: Christian Weinberger 1, Jan Roggenbuck 2, Jan Hanss 3 and Michael Tiemann 1,2,*

Fuente: http://mdpi.com/



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