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Your search keyword '"Chagas, Bruna M. E."' showing total 11 results
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11 results on '"Chagas, Bruna M. E."'

3. Pyrolysis-GCMS of Spirulina platensis: Evaluation of biomasses cultivated under autotrophic and mixotrophic conditions

Author

Paula, Sueilha F. A., primary, Chagas, Bruna M. E., additional, Pereira, Maria I. B., additional, Rangel, Adriano H. N., additional, Sassi, Cristiane F. C., additional, Borba, Luiz H. F., additional, Santos, Everaldo S., additional, Asevedo, Estefani A., additional, Câmara, Fabiana R. A., additional, and Araújo, Renata M., additional

Published
2022
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5. Energetic characterization and flash pyrolysis of different elephant grass cultivars (Pennisetum purpureum Schum.).

Author

de O. Lessa, Mayara, Q. Calixto, Guilherme, das Chagas, Bruna M. E., M. Aguiar, Emerson, de F. Melo, Marcus A., and M. Braga, Renata

Subjects
CENCHRUS purpureus, PYROLYSIS, CULTIVARS, ALTERNATIVE fuels, CARBON emissions, ORGANIC acids
Abstract

Limited fossil fuel reserves combined with greenhouse gas intensification due to CO2 emissions has encouraged research in renewable fuels. In this work, a flash pyrolysis study of elephant grass cultivars—Pennisetum purpureum Schum cultivar Mott (MEG), P. purpureum Schum cultivar Roxo (REG), and P. purpureum Schum cultivar Capiaçu (CEG)—was carried out. The biomasses were evaluated in terms of energy characterization by proximate and ultimate analysis, thermogravimetric analyses (TG/DTG), X‐ray diffraction (XRD), Fourier transform infrared (FTIR), and analytical pyrolysis (Py‐GC/MS) at 600°C. The characterization results showed that these biomasses have potential for energy applications and to produce valuable chemicals. The pyrolysis products produced were mainly oxygenated, including short‐chain organic acids (C1‐C4), furans, esters, aldehydes, ketone, and phenols. Although the obtained results were similar for the three biomasses with small variations in the yields of the pyrolysis products, the study reveals an important difference in terms of energy density. CEG was proven as the most promising elephant grass cultivar to be applied for fast pyrolysis to obtain bio‐oil due to its higher dry matter production (2115 t km−2), power generated (9529 MWh km−2), HHV (16.22 MJ kg−1), lower ash content (6.75%), higher volatile content (74.84%), and higher carbon content (42.57%). [ABSTRACT FROM AUTHOR]

Published
2022
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7. Mixotrophic cultivation of Spirulina platensis in dairy wastewater: Effects on the production of biomass, biochemical composition and antioxidant capacity

Author

Pereira, Maria I. B., primary, Chagas, Bruna M. E., additional, Sassi, Roberto, additional, Medeiros, Guilherme F., additional, Aguiar, Emerson M., additional, Borba, Luiz H. F., additional, Silva, Emanuelle P. E., additional, Neto, Júlio C. Andrade, additional, and Rangel, Adriano H. N., additional

Published
2019
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11. Study of a desulfurization process to convert dibenzothiophene to 2-hydroxybiphenyl by Rhodococcus rhodochrous NRRL (B-2149)

Author

Soares Júnior, Aldo B., Gurgel, Yanne K. P., Chagas, Bruna M. E., Domingos, Thyrone B., Macedo, Gorete R., and Santos, Everaldo S.

Abstract

[Abstract] Actually, a great effort is being given to research on biodesulfurization processes, i.e., processes in which sulfur can be removed selectively from sulfur-compound moities without altering its British thermal unit. This effort relies on the fact that fossil fuels (coal and oil) contain organic sulfur compounds that are released after combustion to the environment mainly as SO2 that causes acid rain becoming a potential pollutant. In this work we investigate the biodesulfurization of a model molecule that represents the main class of a group of recalcitrant compounds found in petroleum, Dibenzothiophene (DBT), to produce 2-Hydroxybiphenyl (2-HBP), a sulfur-free compound, by Rhodococcus rhodochrous (NRRL B-2149) using the 4S pathway. Experiments in which R. rhodochrous (NRRL B- 2149) was cultived during exponential growth phase using glucose and DBT as carbon and energy and sulfur sources, respectively, showed that the microorganism follows the 4S metabolic pathway in which DBT is converted to 2-HBP and sulfite. It was also showed that R. rhodochrous (NRRL B-2149) has cell-bounding surface active agents that that facilitates the emulsification of the apolar – water immiscible DBT.

Published
2007

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