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The long-term catalytic performance of mixed oxides in fixed-bed reactors in transesterification
Authors: Frolich Karel | Vávra Aleš | Kocík Jaroslav | Hájek Martin | Jílková Alena
Year: 2019
Type of publication: článek v odborném periodiku
Name of source: Renewable Energy
Publisher name: Elsevier
Place: Kidlington
Page from-to: 1259-1267
Titles:
Language Name Abstract Keywords
cze Dlouhodobá výkonnost směsných oxidů v reaktorech s pevným ložem při transesterifikaci Mg-Al a Mg-Fe směsné oxidy s konstantním molárním poměrem (3:1) byly testovány při transesterifikaci řepkového oleje s metanolem v reaktoru s pevným ložem. Směsné oxidy byly získány z mateřských vrstevnatých podvojných hydroxidů kalcinací při 500 °C. hydrotalcity; směsné oxidy; transesterifikace; reaktor s pevným ložem; dlouhodobý test; stabilita
eng The long-term catalytic performance of mixed oxides in fixed-bed reactors in transesterification Mg-Al and Mg-Fe mixed oxides with a constant molar ratio (3:1) were tested in the transesterification of rapeseed oil with methanol in a fixed-bed reactor. The mixed oxides were obtained from parent layered double hydroxides by calcination at 500 degrees C. The synthesized materials were characterized by several experimental techniques such as XRD, TG-MS, TPD-CO2, DRIFT and SEM. The transesterification was carried out at different weight hour space velocities (WHSVs; 1, 2 and 3 h(-1)) and different reaction temperatures (115, 150 and 200'C), with every parameter tested for 32 h. Moreover, the stability of the catalysts was tested by the determination of the metal content in the reaction mixture. The ester yield increases with decreasing WHSV and with increasing reaction temperature. The Mg-Al mixed oxides were more active for all WHSVs and for temperatures of 115 degrees C and 150 degrees C due to the lower crystallite size and particularly higher concentration of basic species. For the reaction temperature of 200'C, the catalyst activity was almost the same for both catalysts. A long-term catalytic test (300 h) for the verification of the catalyst lifetime and stability was also carried out with insignificant leaching of metals. (C) 2019 Elsevier Ltd. All rights reserved. Hydrotalcites; Mixed oxides; Transesterification; Fixed-bed reactor; Long-term test; Stability

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