Open AccessCHARACTERIZATION AND CATALYTIC ACTIVITY OF K2CO3/Al2O3IN THE TRANSESTERIFICATION OF SUNFLOWER OIL IN CONVENTIONAL AND MICROWAVE HEATING
Author(s) -
Paola E. Gama,
Elizabeth R. Lachter,
Rosane A. S. San Gil,
Aline V. Coelho,
Isadora A. Sidi,
Rodrigo L. Poubel,
Arnaldo C. Faro,
Andréa Luzia F. de Souza
Publication year - 2014
Publication title -
química nova
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.214
H-Index - 73
eISSN - 1678-7064
pISSN - 0100-4042
DOI - 10.5935/0100-4042.20140300
Subject(s) - transesterification , calcination , sunflower oil , physisorption , mesoporous material , catalysis , potassium , methanol , biodiesel production , biodiesel , nuclear chemistry , materials science , infrared spectroscopy , sunflower , potassium carbonate , inorganic chemistry , chemistry , organic chemistry , agronomy , biochemistry , biology
Commercial and synthetic mesoporous aluminas impregnated with potassium carbonate were characterized by X-ray diffraction (XRD), nitrogen physisorption, infrared spectroscopy and 27Al MAS NMR. The activities in the transesterification reaction of sunflower oil with methanol for biodiesel production were evaluated. 27Al MAS NMR spectra evidenced the presence of AlIV and AlVI in the samples, and also of AlV sites in the mesoporous synthesized alumina, which disappeared after impregnation with potassium salt followed by calcination. All aluminas containing potassium were active for biodiesel production from sunflower seed oil, with high conversions by both conventional heating and microwave irradiation