Banca de DEFESA: PATRICIA VASCONCELOS BARBOSA SANTIAGO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : PATRICIA VASCONCELOS BARBOSA SANTIAGO
DATA : 27/02/2020
HORA: 14:00
LOCAL: Auditório, 8º andar, Bloco B, Campus SA da Fundação Universidade Federal do ABC, localizada na Avenida dos Estados, 5001, Santa Terezinha, Santo André, SP
TÍTULO:

Perovskites as electrocatalyst for glycerol electrooxidation

PÁGINAS: 90
RESUMO:

As biodiesel global production has increased in the past few years, the availability of its co-product, glycerol, has exceed consumption resulting in tremendous loss of commercial value. Some studies have been conducted in order to identify the ideal electrocatalyst to convert glycerol into raw materials with higher added value. Different metals as Pt, Ag, Au, Pd, and alloys have been studied in the search for a condition with high selectivity and minimum cost. Interesting results in terms of selectivity have been achieved, but the electrocatalyst cost is still an issue. Perovskite oxides have been largely studied as catalysts for heterogeneous catalysis of glycerol reforming, due to its low cost, large superficial area and ease of preparation. Perovskites have also been evaluated as electrocatalyst for oxygen reduction reaction (ORR), solar cells and nitrogenized products degradation with promising results. In the present work we investigatedLaCoO_3, La₂CuO_4, LaNiO₃ and some substituted LaNiO₃ (LaNiO₃/Ce and LaNiO₃/Pt) perovskite as electrocatalysts for glycerol oxidation. The materials were synthetized by citrate method assisted by microwave. The obtained materials were characterized by SEM, EDS and XRD. Electrochemical performance was invetigated in alkaline media and glycerol concentration of 0.1molL^-1. The most active pure perovskites were LaNiO₃ and LaCoO₃. The main oxidation products identified by SNIFTIRS and online collection HPLC during glycerol electrooxidation were  glycolic acid and formic acid as final product. The addition of cerium during the catalyst syntheses seems to lead to a more active and stable catalyst by forming a solid solution of CeO₂ and LaNiO₃. The result indicates that perovskites are promising materials for glycerol oxidation as they can deliver high current, around 200 times higher than nickel nanoparticles, with selectivity to glycolic and formic acids.

MEMBROS DA BANCA:
Presidente - Interno ao Programa - 1838759 - JANAINA DE SOUZA GARCIA
Membro Titular - Examinador(a) Interno ao Programa - 1544341 - WENDEL ANDRADE ALVES
Membro Titular - Examinador(a) Interno ao Programa - 2351974 - JULIANA DOS SANTOS DE SOUZA
Membro Titular - Examinador(a) Externo à Instituição - ELTON FABIANO SITTA - UFSCAR
Membro Titular - Examinador(a) Externo à Instituição - PABLO SEBASTIÁN FERNÁNDEZ - UNICAMP
Membro Suplente - Examinador(a) Interno ao Programa - 1544381 - MAURO COELHO DOS SANTOS
Membro Suplente - Examinador(a) Externo ao Programa - 1734908 - FABIO FURLAN FERREIRA
Membro Suplente - Examinador(a) Externo à Instituição - LUANNA SILVEIRA PARREIRA