Banca de DEFESA: MARCELA MAGALHAES DE PAULA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : MARCELA MAGALHAES DE PAULA
DATE: 29/06/2022
TIME: 09:30
LOCAL: Conexão Remota pelo link: https://meet.google.com/dym-rsif-mkc
TITLE:

INFLUENCE OF THE POLYMERIC PRECURSOR ON THE SYNTHESIS VIA ONE STEP POLYMERIZATION OF CuO/CeO2 CATALYSTS AND EVALUATION IN SELECTIVE CATALYTIC OXIDATION OF ACETRONITRILE

KEY WORDS:

selective catalytic oxidation; acetonitrile; polymerization method

PAGES: 132
BIG AREA: Engenharias
AREA: Engenharia Química
SUBÁREA: Processos Industriais de Engenharia Química
SPECIALTY: Processos Inorgânicos
SUMMARY:

Given the growing concern about air pollution caused by the emission of greenhouse gases and volatile organic compounds, such as ammonia, carbon monoxide and nitrided gases, several alternatives have emerged to contain it. In view of the technologies already implemented, in the present work selective catalytic oxidation was applied to treat acetonitrile on CeO2 supports and CuO/CeO2 catalysts synthesized by the one-step polymerization method. In which the focus was to evaluate the influence of the complexing agent, varying the acids, in citric, malic and oxalic, and the presence of copper II in the final properties of the catalysts. As well as the catalytic performance during the reaction and their respective selectivities in N2 and CO2 production. Finally, the effects of these variants on the formed materials were investigated through physical characterization techniques, such as Thermogravimetric Analysis (ATG), Fourier Transform Infrared Spectroscopy (FTIR), X-Ray Diffraction (XRD), Physisorption with N2 (B.E.T. method), Scanning Electron Microscopy (SEM), Programmed Temperature Reduction (TPR-H2) and Temperature Programmed Desorption (TPD-CO2). From the XRD diffratrograms, the presence of CeO2 in the prepared catalysts was identified, it was also noted that the deposition of CuO in the synthesized materials did not change their structure. Physisorption analyzes with N2 provided isotherm profiles that varied between supports and catalysts, in addition to demonstrating that those synthesized with oxalic acid (CeOx and CeOxCu) had the highest specific areas, compared to those with malic acid (CeMa and CeMaCu). and citrus (CeCi and CeCiCu). Since these presented larger volumes and pore sizes as evidenced in the BET, these properties were related to the stability of their polymeric chains demonstrated by the ATG. Furthermore, in catalytic tests conducted in the range of 100-600 °C for 1 hour, 100% conversion of acetonitrile was identified for all supports and catalysts at temperatures below 350 °C. With high selectivity in N2 and CO2 for CeMa and CeMaCu.

BANKING MEMBERS:
Externo à Instituição - ADRIANO LOPES DE SOUZA - UFSCAR
Presidente - 1759475 - JORGE DAVID ALGUIAR BELLIDO
Interno - 1435340 - MARCELO DA SILVA BATISTA