Banca de QUALIFICAÇÃO: KEVERSON GOMES DE OLIVEIRA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : KEVERSON GOMES DE OLIVEIRA
DATE: 02/06/2022
TIME: 08:30
LOCAL: Remotamente pelo google meet
TITLE:

Sustainable Biodiesel Production: Development of Green Catalysts, Transesterification of Waste Cooking Oil and Conversion of Glycerol into New Products

KEY WORDS:

Green catalysts, Ash from banana and tangerine peel; Sodium and Potassium Silicates, Silica MPI; Biodiesel; Waste cooking oil, Glycerol derivatives.

PAGES: 129
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Química Orgânica
SPECIALTY: Química dos Produtos Naturais
SUMMARY:

Several researches emerge in the search for energy alternatives to the use of fossil fuels, mainly due to the emissions of gases that contribute to accentuate climate change. Among the possibilities, biodiesel allows the reduction of the use of diesel, contributing to the reduction of environmental impacts, since it is obtained from a natural and renewable source. This work proposed a sustainable process for the production of biodiesel from waste cooking oil (WCO), starting from the application of green catalysts, obtained from banana (BPC) and tangerine (TPC) peels ashes, in addition to sodium and potassium silicates (SKS) originated from beach sand. Furthermore, the synthesis conditions of glycerol derivatives, a by-product of the transesterification reaction, were evaluated. The techniques used to characterize the catalysts were: XRD, XRF, TG/DTG, FTIR, TPD-CO₂, and the deconvolution of DTG and CO₂-TPD curves. Biodiesel was analyzed by ¹H and ¹³C NMR, FTIR, TG/DTG (by the deconvolution method on DTG curves), and physicochemical properties. Reaction parameters as time, molar ratio A/O, and catalyst concentration were evaluated in the biodiesel synthesis. The solid materials BPC and TPC showed similar composition, with potassium-containing compounds being the majority. The CO₂-TPD analyzes indicated mainly moderate to strong basic sites in the SPS and BPC materials, and weak sites in the TPC. The OCR biodiesels formed with the catalysts TPC, SPS and BPC showed conversions of 91.32%, 93.89% and 90.88%, respectively. Glycerol was converted into acetins using catalysts based on transition metal oxides and ¹³C NMR spectra confirmed the synthesis. In this work, the production of biodiesel was a sustainable and low-cost process due to the use of green catalysts, waste cooking oil and the obtaining products derived from glycerol.

BANKING MEMBERS:
Externo à Instituição - CARLOS AUGUSTO CABRAL KRAMER - IFRN
Externa à Instituição - LEILA MARIA AGUILERA CAMPOS - UNIFACS
Externo à Instituição - LEONARDO SENA GOMES TEIXEIRA - UFBA
Presidente - 1805556 - LUCIENE DA SILVA SANTOS
Interna - 2413537 - POLLYANA SOUZA CASTRO