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Statistical evaluation of the mutual relations of properties of Mg/Fe hydrotalcites and mixed oxides as transesterification catalysts
Authors: Hájek Martin | Tomášová Adéla | Kocík Jaroslav | Podzemná Veronika
Year: 2018
Type of publication: článek v odborném periodiku
Name of source: Applied Clay Science
Publisher name: Elsevier Science BV
Place: Amsterdam
Page from-to: 28-35
Titles:
Language Name Abstract Keywords
cze Statické zhodnocení vzájemných vztahů vlastností Mg/Fe hydrotalcitů a směsných oxidů jako katalyzátorů pro transesterifikaci Byly připraveny Mg-Fe směsných oxidů s různými oměry Mg/Fe (od 1:1 do 8:1) z LDH jako prekurzorů tepelným zpracováním. LDH byly syntetizovány koprecipitační metodou. připravené materiály byly testovány v transesterifikaci a charakterizovány řadou metod. Vzájemné vztahy mezi materiálovými vlastnostmi byly stanoveny statistickou analýzou získaných údajů. Mg-Fe hydrotalcity; Mg-Fe směsné oxidy; statistická analýza; transesterifikace
eng Statistical evaluation of the mutual relations of properties of Mg/Fe hydrotalcites and mixed oxides as transesterification catalysts The Mg-Fe mixed oxides with different Mg/Fe molar ratio (from 1:1 to 8:1) and temperature pre-treatment (0-900 degrees 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 degrees C. The highest yield of oil was achieved with Mg/Fe molar ratio 5:1 calcined at 500 degrees C. Moreover, statistical evaluation with the aim to find the relations between properties of synthesized material was carried out. Mg-Fe hydrotalcites; Mg-Fe mixed oxides; Statistical analysis; Transesterification

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