Banca de DEFESA: MATEUS COSTA MEDEIROS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : MATEUS COSTA MEDEIROS
DATE: 13/03/2020
TIME: 14:00
LOCAL: AUDITÓRIO DO IQ III
TITLE:

Obtaining High Value Added Products From The Technical Liquid Of Cashew Nuts Using Electrochemical Oxidation With Active And Inactive Anodes

KEY WORDS:

Anodic oxidation; Carboxylic Acids; Green Chemistry; Electrosynthesis

PAGES: 57
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Físico-Química
SPECIALTY: Eletroquímica
SUMMARY:

Electro-organic synthesis is undergoing a renaissance due to the tremendous contributions of various electrocatalytic materials, as well as the use of electrical current as a cheap and suitable reagent to conduct electrosynthetic transformations, avoiding the use of oxidizing or reducing agents. Consequently, electrosynthesis has a significant impact due to its advantages such as versatility, environmental compatibility (possibility to recover and recycle unconverted substrates), automation (turning on or off electric current), inherent safety and potential cost-benefit, among others. In this context, the electrochemical synthesis mechanism depends on the nature of the electrode material used, that is, the species formed depend on the anode or cathode used. Boron-doped diamond (BDD) electrodes belong to the class of inactive anodes that lead to the combustion of organic matter, producing few intermediates and low selectivity in the reaction. However, dimensionally stable anodes (DSA) belong to the class of active anodes that are characterized in producing different intermediates and having selective reactions. Therefore, in this work, the performance of BDD and DSA (Ti/RuO2IrO2TiO2) in the electro-oxidation of cashew nut shell liquid (CNSL) was evaluated, in order to favor its conversion into products with high added value, such as carboxylic acids. The evolution of five carboxylic acids was followed over time for three different current densities, using 0.10% and 0.01% LCC in NaOH 1.00 mol L-1 for BDD and DSA respectively. At 70 mA cm-2, the most notable increase in organic acid concentrations occurred during the last two hours, reaching electrochemical conversions of 4.1 and 7.8% for acetic and oxalic acids, respectively for BDD anode, already in DSA the conversion was more selective, producing only acetic acid with a yield of 11.7% in 30 minutes of electrolysis.

BANKING MEMBERS:
Presidente - 1645110 - CARLOS ALBERTO MARTINEZ HUITLE
Externa à Instituição - DANYELLE MEDEIROS DE ARAUJO - UERN
Interno - 348475 - DJALMA RIBEIRO DA SILVA
Externo à Instituição - MARCO ANTONIO QUIROZ ALFARO - udlap