Banca de QUALIFICAÇÃO: PEDRO HENRIQUE DO NASCIMENTO SILVA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : PEDRO HENRIQUE DO NASCIMENTO SILVA
DATE: 01/07/2025
TIME: 14:00
LOCAL: Auditório do NUPPRAR
TITLE:

Manganese-Catalyzed Hydrodecarboxylation of Oleaginous Biomass for the Production of Sustainable Aviation Fuels.

KEY WORDS:

redox-active ester; hydrodecarboxylation; manganese; sustainable hydrocarbons

PAGES: 80
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Química Orgânica
SPECIALTY: Síntese Orgânica
SUMMARY:

The diversification of the global energy matrix is crucial for mitigating anthropogenic emissions and the negative impacts associated with greenhouse gases (GHGs) resulting from the combustion of fossil fuels, which, in Brazil, reached 428 Mt of CO₂ in 2023. In this context, the hydrodecarboxylation of fatty acids derivatized as N-hydroxyphthalimide (NHPI) redox-active esters emerges as a promising alternative for the production of renewable hydrocarbons suitable for use as fuels. This approach stands out for not requiring harsh temperature or pressure conditions, as well as for avoiding the use of gaseous hydrogen (H₂) and the synthesis of catalysts with specific properties. This study focuses on reductive metal catalysis mediated by manganese — a low-cost, non-toxic, and widely available metal. Parameters such as solvent, catalysts, hydrogen source, additives, stoichiometry, concentration, reaction time, temperature, and control experiments were evaluated. Hydrodecarboxylation of the redox-active ester derived from lauric acid yielded undecane with 70% isolated yield and over 99% conversion, following an optimization process that involved 84 reactions under varied conditions, including replicates of the method.Subsequently, the reaction scope was expanded to include other commercially available derivatized fatty acids, enabling the production of sustainable hydrocarbons in the SAF (Sustainable Aviation Fuel) range (C9–C17) with high selectivity, conversions above 87%, and yields ranging from 41% to 70%, using an operationally simple method that avoids the challenges typically associated with conventional deoxygenation protocols.Quantitative and qualitative characterization of the products was performed using gas chromatography with flame ionization detection (GC-FID) and mass spectrometry (GC-MS).

COMMITTEE MEMBERS:
Presidente - 2140818 - AMANDA DUARTE GONDIM
Interno - 350509 - ANTONIO SOUZA DE ARAUJO
Externa à Instituição - ARUZZA MABEL DE MORAIS ARAUJO - UFRN
Externa à Instituição - JANNYELY MOREIRA NERI - UFRN
Externa ao Programa - 2140775 - LIVIA NUNES CAVALCANTI - null