Thermal decomposition of a peroxopolytitanic acid cryogel: TA/MS study
| Autor: | Jan Šubrt, Jakub Havlín, Monika Palkovská, Václav Slovák, Jaroslav Boháček |
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| Rok vydání: | 2017 |
| Předmět: |
Anatase
Evolved gas analysis Chemistry Thermal decomposition 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Mass spectrometry 01 natural sciences Decomposition 0104 chemical sciences Adsorption Organic chemistry Physical and Theoretical Chemistry Fourier transform infrared spectroscopy 0210 nano-technology Thermal analysis Instrumentation Nuclear chemistry |
| Zdroj: | Thermochimica Acta. 647:1-7 |
| ISSN: | 0040-6031 |
| DOI: | 10.1016/j.tca.2016.11.009 |
| Popis: | Thermal decomposition of a peroxopolytitanic acid cryogel was followed by simultaneous thermal analysis (TG/DTA) coupled with mass spectrometer (MS) and infrared spectroscope (FTIR). During the decomposition, the evolution of H 2 O (either residual moisture or as product of dehydration reactions), NH 3 (precipitating agent used in preparation), O 2 (decomposition of peroxogroups), SO 2 (decomposition of residual sulfates), N 2 (freezing agent in preparation), N 2 O, NO, NO 2 (products of NH 3 oxidation) and CO 2 (adsorbed from atmosphere) was sought for. It was determined, that the decomposition is a four step process. During the first step, water and carbon dioxide evolve. At around 300 °C both N 2 O and CO 2 ( m / z = 44) were detected, as confirmed by FTIR spectroscopy. At 430–450 °C (depending of heating rate) amorphous phase crystallizes into anatase. |
| Databáze: | OpenAIRE |
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