Banca de DEFESA: RAMONI RENAN SILVA DE LIMA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : RAMONI RENAN SILVA DE LIMA
DATE: 12/03/2021
TIME: 14:00
LOCAL: Remotamente pelo Google Meet
TITLE:

OBTAINING SOYBEAN OIL BIODIESEL USING HETEROGENEOUS CATALYST FROM PONKAN TANGERINE PEEL ASHES (C. RETICULATA BLANCO)

KEY WORDS:

Catalyst, Ponkan tangerine peel ashes, C. reticula Blanco, Biodiesel, Response Surface Methodology, Software Design Expert.

PAGES: 85
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Química Inorgânica
SPECIALTY: Química Bio-Inorgânica
SUMMARY:

The advance of global energy demand has intensified environmental problems caused by the use of fossil fuels and has been driving the search for and development of greener matrices, which are being used in order to minimize environmental impacts and human health. This work proposed a sustainable process for the production of biodiesel, an alternative fuel to diesel, with the use of a heterogeneous, green catalyst, called CT, derived from a residual biomass, from the bark of 'Ponkan' mandarin (Citrus reticulata Blanco). Through d-optimal experimental planning to obtain soybean biodiesel, process parameters such as: methanol/oil molar ratio, catalyst concentration, temperature and reaction time were optimized. Initially, three catalyst samples were prepared by calcination of the ashes of the tangerine barks at a time of 4h, CT7 (700 ° C), CT8 (800 ° C) and CT9 (900 ° C), and after preliminary tests, the yields (m/m) in biodiesel were 79.77, 77.58 and 77.40 %, respectively. The mass catalyst yield obtained for each temperature (700, 800 and 900 °C) starting from 50 g of bark were 3.76, 1.54 and 0.98%, respectively. The catalysts were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM-FEG), X-ray dispersive energy (EDS), CO2 desorption at programmed temperature (TPD-CO2), thermal analysis (TG/DTG) and Hammett's basicity test.  The quality of biodiesel was evaluated according to the standard procedures established by ASTM (American Society for Testing and Materials) for the properties of kinematic viscosity and density. The XRD patterns of the CT catalyst showed the peaks associated with the characteristic phases of K2CO3, K2O, K2Ca(CO₃)₂, SiO₂, Na₂O confirmed by XRD and FRX, which identified large proportions of these oxides. TPD-CO2 analysis demonstrated the presence of weak and moderate base sites in the CT catalyst. Good thermal stability was observed through the TG/DTG curves. The optimized conditions generated by the response surface were: 3 h reaction time, catalyst concentration of 3.5% m/m, molar ratio of 15: 1 (methanol: oil) and temperature of 64 ° C. For these optimized conditions, the conversion of the reaction quantified by ¹H NMR was greater than 87% and the catalyst presented reuse capacity of up to 5 times.

BANKING MEMBERS:
Externa à Instituição - ANNE GABRIELLA DIAS SANTOS - UERN
Externa à Instituição - IVONEIDE DE CARVALHO LOPES BARROS - UFRPE
Presidente - 1805556 - LUCIENE DA SILVA SANTOS
Interno - 1149328 - VALTER JOSE FERNANDES JUNIOR