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Publication detail

Mg-Fe mixed oxides and their rehydrated mixed oxides as catalysts for transesterification
Authors: Hájek Martin | Kocík Jaroslav | Frolich Karel | Vávra Aleš
Year: 2017
Type of publication: článek v odborném periodiku
Name of source: Journal of Cleaner Production
Publisher name: Elsevier Science
Place: Oxford
Page from-to: 1423-1431
Titles:
Language Name Abstract Keywords
cze Mg-Fe směsné oxidy a jejich rehydratované směsné oxidy jako katalyzátory pro transesterifikaci Mg-Fe hydrotalcity s konstantním poměrem Mg/Fe = 2,5 byly připraveny z dvou typů prekurzorů a tepelně zpracovány při různých teplotách. Velikost krystalitů stoupala s časem stárnutí materiálů. Připravené materiály byly testovány jako katalyzátory v transesterifikaci řepkového oleje a charakterizovány řadou technik (XRD, TG-MS, stanovení specifickho povrchu, distribuce pórů a bazicity). bionafta; transesterifikace; hydrotalcity; Mg-Fe směsné oxidy; rehydratace
eng Mg-Fe mixed oxides and their rehydrated mixed oxides as catalysts for transesterification The Mg-Fe hydrotalcites with a constant molar ratio (Mg/Fe 2.5:1) were synthesized from two types of precursors (chlorides and nitrates of metals) and thermally pre-treated at different temperatures (500 and 600 degrees C). It was found that the crystallite size of hydrotalcite increases with an increasing aging time. The synthesized materials were tested in the transesterification of rapeseed oil. All synthesized materials were characterized by several techniques such as X-ray Powder Diffraction, thermogravimetric analysis with a mass spectrometer, the determination of specific surface area, pore size distribution and basicity of oxides. It was found that crystallite size, the amount of the crystalline phase and specific surface area were almost the same for both precursors. After calcination, the mixed oxides from the nitrate precursors revealed higher amount of basic sites and population of stronger basic sites than from the chloride precursors. The rehydration, i.e. the restoration of a layered structure, successfully proceeded for hydrotalcite synthesized from nitrates calcined at 500 degrees C. However, in the case of chlorides, the hydrotalcite had to be calcined at 600 degrees C so that the rehydration was successful. The materials synthesized from chlorides have a lower conversion (25%) than material synthesis from nitrates (60%). Biodiesel; Transesterification; Hydrotalcites; Mg-Fe mixed oxides; Rehydration

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