Geopolymers
Inorganic polymeric new materials
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Mirela Barbu
Mirela Barbu
Faculty of Chemistry and Chemical Engineering, University “Politehnica” Timisoara, P. Victoriei No. 2, 300006, Timisoara, Romania
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Mircea Stefanescu
Mircea Stefanescu
Faculty of Chemistry and Chemical Engineering, University “Politehnica” Timisoara, P. Victoriei No. 2, 300006, Timisoara, Romania
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Marcela Stoia
Marcela Stoia
Faculty of Chemistry and Chemical Engineering, University “Politehnica” Timisoara, P. Victoriei No. 2, 300006, Timisoara, Romania
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Gabriela Vlase
Gabriela Vlase
Research Center for Thermal Analysis in Environmental Problems, West University of Timisoara, Timisoara, Romania
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Paul Barvinschi
Paul Barvinschi
Faculty of Physics, West University of Timisoara, Bv. V. Parvan No. 4, 300223, Timisoara, Romania
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Abstract
In this article, we present a new method for the obtaining of ZnCr2O4 and MgCr2O4 embedded in silica matrix. This method consists in the formation of Cr(III), Zn(II) and Cr(III), Mg(II) hydroxycarboxylate/carboxylate compounds, during the redox reaction between the nitrate ion and diol (1,3-propanediol), uniformly dispersed in the pores of hybrid gels. The thermal decomposition of these precursors leads to a mixture of corresponding metal oxides. The gels were synthesized starting from mixtures of Cr(NO3)3·9H2O, Zn(NO3)2·6H2O and Cr(NO3)3·9H2O, Mg(NO3)2·6H2O with tetraethyl orthosilicate and 1,3-propanediol for final compositions 50% ZnCr2O4/50% SiO2 and 50% MgCr2O4/50% SiO2. The obtained gels have been thermally treated at 140 °C, when the redox reaction nitrates-diol took place with formation of the precursors within the xerogels pores. The thermal decomposition of all precursors took place up to 300 °C, with formation of oxides mixtures (Cr2O3 + x and ZnO) and (Cr2O3 + x and MgO), respectively. At 400 °C, Cr2O3 + x turn to Cr2O3 which reacts with ZnO forming ZnCr2O4/SiO2. Starting with 400 °C, Cr2O3 reacts with MgO to an intermediary phase MgCrO4, which decomposes with the formation of MgCr2O4/SiO2. The formation of the precursors inside the silica matrix and the evolution of the crystalline phases were studied by thermal analysis, FT-IR spectrometry, XRD, and TEM.
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| Journal of Thermal Analysis and Calorimetry | |
|---|---|
| Language | English |
| Size | A4 |
| Year of Foundation |
1969 |
| Volumes per Year |
1 |
| Issues per Year |
24 |
| Founder | Akadémiai Kiadó |
| Founder's Address |
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. |
| Publisher | Akadémiai Kiadó Springer Nature Switzerland AG |
| Publisher's Address |
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11. |
| Responsible Publisher |
Chief Executive Officer, Akadémiai Kiadó |
| ISSN | 1388-6150 (Print) |
| ISSN | 1588-2926 (Online) |
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Temperature dependence of the rate of reaction in thermal analysis
The Arrhenius equation in condensed phase kinetics
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