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The influence of various anions in Mg-Al mixed oxides on presence of sodium ions in transesterification of oil
Authors: Malisova Miroslava | Hájek Martin | Kocián David | Malina Jan | Peller Andras | Hornacek Michal
Year: 2022
Type of publication: článek v odborném periodiku
Name of source: Fuel
Publisher name: Elsevier Science
Place: Oxford
Page from-to: "123781-1"-"123781-9"
Titles:
Language Name Abstract Keywords
cze Vliv různých aniontů ve směsných oxidech Mg-Al na přítomnost sodíkových iontů v transesterifikaci olejů Směsné oxidy Mg-Al s konstantním molárním poměrem Mg/Al (2:1) byly syntetizovány tepelným zpracováním a rehydratovány. Byly syntetizovány hudrotalcity s různými anionty a sledován jejich vliv na množství sodíkových iontů a vlastnosti materiálů. Materiály byly charakterizovány řadou technik (ICP-OES, XRD, TPD, fyzisorpce, FTIR a testovány jako katalyzátory transesterifikace. MgAl směsné oxidy; transesterifikace; Na+; anionty; rehydratace
eng The influence of various anions in Mg-Al mixed oxides on presence of sodium ions in transesterification of oil The paper is focused on the influence of sodium ions in Mg-Al mixed oxides as heterogenous catalyst in the transesterification of non-edible Camelina sativa oil. The Mg-Al mixed oxides with a constant molar ratio Mg:Al (2:1) were synthesized from hydrotalcites by thermal treatment (450 °C, 3 h) and rehydrated. The novelty lays in the synthesis of the hydrotalcites with various types of anions (SO4-2, Cl-, CH3COO-, HCO3-, C2O4-2), which influence the sodium amount in materials and so its properties. The results of various characterisation methods such as ICP-OES, XRD, TPD, N-2-physisorption, FTIR were statistically evaluated, including transesterification results. The sodium was bonded predominantly in the form of sodium nitrates (nitrates were used for hydrotalcite synthesis) for all types of anions and the rehydration (i) rapidly decreased the sodium content and (ii) caused more similarity of mixed oxides with each other regardless of anion type. The sodium influenced especially acid-base properties and so the ester yield, because the sodium nitrates blocked the pores and also disturbed the TPD determination, which is also a novelty. The explanation of the influence of sodium ions enables to synthesize more stable catalyst, whose use will be environmentally beneficial. Mg-Al mixed oxides; transesterification; sodium; anions; rehydration

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