Statistical evaluation of the mutual relations of properties of Mg/Fe hydrotalcites and mixed oxides as transesterification catalysts
| Autor: | Jaroslav Kocík, Adéla Tomášová, Martin Hájek, Veronika Podzemná |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Thermogravimetric analysis
Materials science Hydrotalcite Magnesium Layered double hydroxides chemistry.chemical_element Geology 02 engineering and technology Transesterification engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention chemistry Geochemistry and Petrology law Specific surface area engineering Calcination Leaching (metallurgy) 0210 nano-technology Nuclear chemistry |
| Zdroj: | Applied Clay Science. 154:28-35 |
| ISSN: | 0169-1317 |
| Popis: | The Mg-Fe mixed oxides with different Mg/Fe molar ratio (from 1:1 to 8:1) and temperature pre-treatment (0–900 °C) were prepared from layered double hydroxides (LDH) as precursors. The LDH were synthesized by co-precipitation method. The formed mixed oxides (calcined LDH) were tested within the transesterification of rapeseed oil including the leaching of magnesium and iron to the liquid products. All synthesized materials were characterized by several techniques such as XRD, thermogravimetric analysis, specific surface area and SEM. The mutual relations between material properties were found by statistical analysis. Moreover, the real molar ratio of Mg/Fe was determined by two independent methods (atomic absorption spectroscopy and X-ray fluorescence-XRF) with nearly the same results. It is possible to use only faster and cheaper XRF. It was found, that mixed oxides were formed at Mg/Fe molar ratio from 2 to 6 and at temperature between 400 and 600 °C. The highest yield of oil was achieved with Mg/Fe molar ratio 5:1 calcined at 500 °C. Moreover, statistical evaluation with the aim to find the relations between properties of synthesized material was carried out. |
| Databáze: | OpenAIRE |
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