Avaliação da natureza da atividade catalítica de compostos de bismuto em reações de metanólise do óleo de soja

Silva, Fabiano Rosa da; Brugnago, Ricardo José; Marangoni, Rafael; Cordeiro, Claudiney Soares; Nakagaki, Shirley; Ramos, Luiz Pereira

doi:10.1590/s0100-40422012000100020

Cited by 4 publications

(2 citation statements)

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“…Also, bismuth compounds present from moderate to strong Lewis acidity due to the deficient nucleus shielding by the f electrons shell (Bi = [Xe] 4f 14 , 5d 10 , 6s 2 , 6p 3 ). 18 As a result, the catalytic behavior of bismuth compounds has been investigated in different chemical reactions, but their application in the esterification of fatty acids is still unknown. Also, bismuth carboxylates are used in the synthesis of different bismuth oxide materials such as superconductors and drugs.…”

Section: Introductionmentioning

confidence: 99%

“…Differently from many heavy metals, bismuth is a noncorrosive metal of low toxicity that is relatively easy to handle. Also, bismuth compounds present from moderate to strong Lewis acidity due to the deficient nucleus shielding by the f electrons shell (Bi = [Xe] 4f 14 , 5d 10 , 6s 2 , 6p 3 ) . As a result, the catalytic behavior of bismuth compounds has been investigated in different chemical reactions, but their application in the esterification of fatty acids is still unknown.…”

Section: Introductionmentioning

confidence: 99%

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Esterification of Fatty Acids Using a Bismuth-Containing Solid Acid Catalyst

et al. 2013

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The conversion of lauric acid and fatty acid mixtures to methyl esters was investigated using bismuth-containing solid catalysts obtained from Bi 2 O 3 . When the reaction was carried out at 140 °C for 2 h using a methanol:fatty acid molar ratio of 2:1 and 5 wt % of Bi 2 O 3 in relation to the mass of fatty acids, conversions up to 87 wt % were achieved even after four consecutive reaction cycles. Besides the observed catalytic activity, the bismuth-containing solid catalyst was also amenable to recycling for at least four reaction cycles without significant loss of its catalytic performance. However, the analysis of the recovered solids by X-ray diffraction and Fourier transform infrared spectroscopy demonstrated that Bi 2 O 3 was converted to layered bismuth carboxylates, which acted as the actual esterification catalyst. On the basis of these, layered bismuth carboxylates unfold as a suitable catalytic system for the esterification of fatty acids and lipid sources of high acid number.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%