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5 results on '"Iha, Osvaldo K."'

1. Synthesis, Characterization and Use of Alumina Doped with TiO2 and ZrO2 to Produce Biofuels from Soybean Oil by Thermal Cracking, Transesterification and Hydroesterification

Author

Brum,Sarah S., Quirino,Rafael L., Daher,Leila O., Iha,Osvaldo K., Ehlert,Erick M., Rubim,Joel C., and Suarez,Paulo A. Z.

Subjects
soybean oil, thermal cracking, biofuels, transesterification, hydroesterification
Abstract

In this work, different metal oxides containing Ti, Zr and Al were prepared and characterized and their catalytic activities for cracking, transesterification, and hydroesterification reactions of soybean oil were evaluated. It is described the synthesis of the solids by co-precipitation, and their characterization by thermogravimetry, X-ray diffraction, Brunauer-Emmet-Teller surface area determination, Fourier-transformed Raman spectroscopy, and the determination of Lewis and Brønsted acid sites by pyridine adsorption and detection through Fourier transform infrared spectroscopy (FTIR). The hydrocarbons obtained by soybean pyrolysis were analyzed by fractional distillation, acid number, FTIR, density (at 20 °C), viscosity (at 40 °C), and calculation of the cetane number. The results suggest that all of the solids exhibit catalytic activity at the second stage of the cracking reaction (deoxygenation), lowering the final acidity of the products. The solids also exhibited catalytic activity for transesterification and hydroesterification of triacylglycerides, leading to good yields in methyl fatty acid esters.

Published
2022

4. Physicochemical properties of Syagrus coronata and Acrocomia aculeata oils for biofuel production.

Author

Iha, Osvaldo K., Alves, Flávio C.S.C., Suarez, Paulo A.Z., de Oliveira, Maria B.F., Meneghetti, Simoni M.P., Santos, Bruno P.T., and Soletti, João I.

Subjects
*SYAGRUS coronata, *PALM oil, *BIOMASS production, *PLANT species, *TRANSESTERIFICATION, *BIODIESEL fuels industry
Abstract

This work examines the potential of two species of palm-tree, Syagrus coronata (Mart.) Becc. and Acrocomia aculeate , for biodiesel and thermo cracked bio-oil production. These species can offer the opportunity to obtain alternative fats and oils from perennial sources, which permits their combination with other crops or cattle production, as well as the recovery of degraded areas. The physico-chemical properties of the oils, biodiesel and bio-oil obtained from the two palms were evaluated. For biodiesel production, the high acid value of the Acrocomia aculeate crude vegetable oil required a previous acid esterification step to avoid the formation of soaps and stable emulsions, which was not necessary in the case of Syagrus coronata (Mart.) Becc. Concerning their fatty acid composition, SC exhibits mainly short, saturated chains, while AA exhibits long unsaturated chains. The short saturated chains make Syagrus coronata (Mart.) Becc. biodiesel less viscous and more stable to oxidation than Acrocomia aculeate biodiesel. However, both Syagrus coronata (Mart.) Becc. and Acrocomia aculeate biodiesel are in the acceptable range for use as biodiesel in diesel engines, showing promise for the economic exploitation of these raw materials, requiring only the use of an antioxidant additive in the case of Acrocomia aculeate . The bio-oils obtained from both Syagrus coronata (Mart.) Becc. and Acrocomia aculeate were not completely deoxygenated, but the physico-chemical properties showed good potential for producing renewable fuel acceptable for use in diesel engines. However, further studies are needed to achieve their complete deoxygenation and improve their properties. [ABSTRACT FROM AUTHOR]

Published
2014
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5. Potential application of Terminalia catappa L. and Carapa guianensis oils for biofuel production: Physical-chemical properties of neat vegetable oils, their methyl-esters and bio-oils (hydrocarbons).

Author

Iha, Osvaldo K., Alves, Flávio C.S.C., Suarez, Paulo A.Z., Silva, Cassia R.P., Meneghetti, Mario R., and Meneghetti, Simoni M.P.

Subjects
*TERMINALIA catappa, *CRABWOOD, *VEGETABLE oils, *BIOMASS production, *ESTERS, *HYDROCARBONS
Abstract

Highlights: [•] Two perennial tree species were studied as raw material for biofuel production. [•] Oils were obtained from Terminalia catappa L. (TC) and Carapa guianensis (CG). [•] TC and CG oils were used to produce bio-oil and biodiesel. [•] Physical-chemical properties are in acceptable range for biodiesel. [•] The bio-oils obtained showed good potential to produce renewable fuel. [ABSTRACT FROM AUTHOR]

Published
2014
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