Publikace detail

The long-term catalytic performance of mixed oxides in fixed-bed reactors in transesterification

Autoři: Frolich Karel | Vávra Aleš | Kocík Jaroslav | Hájek Martin | Jílková Alena

Rok: 2019

Druh publikace: článek v odborném periodiku

Název zdroje: Renewable Energy

Název nakladatele: Elsevier

Místo vydání: Kidlington

Strana od-do: 1259-1267

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
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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