ChemSusChem p. 2670 - 2680 (2015)
Update date:2022-08-11
Topics:
Tkacheva, Anastasia
Dosmagambetova, Inkar
Chapellier, Yann
M?ki-Arvela, P?ivi
Hachemi, Imane
Savela, Risto
Leino, Reko
Viegas, Carolina
Kumar, Narendra
Er?nen, Kari
Hemming, Jarl
Smeds, Annika
Murzin, Dmitry Yu.
Amidation of renewable feedstocks, such as fatty acids, esters, and Chlorella alga based biodiesel, was demonstrated with zeolites and mesoporous materials as catalysts and ethanolamine, alaninol, and leucinol. The last two can be derived from amino acids present in alga. The main products were fatty alkanol amides and the corresponding ester amines, as confirmed by NMR and IR spectroscopy. Thermal amidation of technical-grade oleic acid and stearic acid at 180°C with ethanolamine were non-negligible; both gave 61% conversion. In the amidation of stearic acid with ethanolamine, the conversion over H-Beta-150 was 80% after 3 h, whereas only 63% conversion was achieved for oleic acid; this shows that a microporous catalyst is not suitable for this acid and exhibits a wrinkled conformation. The highest selectivity to stearoyl ethanolamide of 92% was achieved with mildly acidic H-MCM-41 at 70% conversion in 3 h at 180°C. Highly acidic catalysts favored the formation of the ester amine, whereas the amide was obtained with a catalyst that exhibited an optimum acidity. The conversion levels achieved with different fatty acids in the range C12-C18 were similar; this shows that the fatty acid length does not affect the amidation rate. The amidation of methyl palmitate and biodiesel gave low conversions over an acidic catalyst, which suggested that the reaction mechanism in the amidation of esters was different. Pores versus acidity: The structures and properties of zeolites and mesoporous materials are investigated as catalysts for the amidation of renewable feedstocks, such as fatty acids, esters, and Chlorella alga based biodiesel, with ethanolamine, alaninol, and leucinol as nitrogen sources.
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