Publikace detail

Aspects of potassium leaching in the heterogeneously catalyzed transesterification of rapeseed oil

Autoři: Čapek Libor | Hájek Martin | Kutálek Petr | Smoláková Lucie

Rok: 2014

Druh publikace: článek v odborném periodiku

Název zdroje: Fuel

Název nakladatele: Elsevier Science

Místo vydání: Oxford

Strana od-do: 443-451

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
cze	Aspekty draselného louhování v heterogenní katalyzované transesterifikaci řepkového oleje	Hlavním cílem práce je definovat aspekty stability pevných draselných katalyzátorů (K-CaO, K-MgO and K-Al2O3) v transesterifikaci řepkového oleje pomocí metanolu.	transesterifikace; stabilita; katalyzátory na bázi K; louhování
eng	Aspects of potassium leaching in the heterogeneously catalyzed transesterification of rapeseed oil	The main aim of the work is to define the critical aspects of the stability of solid K-based catalysts (K-CaO, K-MgO and K-Al2O3) in the transesterification of rapeseed oil by methanol. High activity of these catalysts is often reported, but their stability is recently a matter for discussion. The attention is focused on (i) the explanation of the reason of potassium leaching from the solid K-based catalysts into the liquid phase during the reaction, (ii) a description of the role of leached K-species in the reaction and (iii) the suggestion of the mechanism of the potassium leaching from the solid K-based catalysts. It was found that the leaching of K-species is caused by glycerol that is formed during the reaction. The mechanism of K-leaching from the solid catalyst was suggested. The strength of alcohols to attack the K-species on solid catalysts increased with the number of alcohol groups and their mutual distances and has following order: glycerol > 1,3-propanediol > 1,2-propanediol > ethylene glycol > methanol.	Transesterification; Stability; Potassium solid-based catalysts; Leaching

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