Banca de QUALIFICAÇÃO: LUAN DO NASCIMENTO DE MOURA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : LUAN DO NASCIMENTO DE MOURA
DATE: 21/12/2022
TIME: 10:00
LOCAL: Videoconferencia
TITLE:

DEVELOPMENT OF NEW CARBON-BASED MICROPOROUS MATERIALS BY ZEOLITE TEMPLATE

KEY WORDS:

Zeolite. Faujazite. Mordenite. Chemical Synthesis. Zeolite Template Carbons. Molecular Sieves.

PAGES: 70
BIG AREA: Engenharias
AREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
SPECIALTY: Cerâmicos
SUMMARY:

The progress of industrial technologies in recent decades is remarkable due to advances related to obtaining new nano- and microstructured materials when the scale of at least one dimension is between 1 and 100 nm. Microporous materials have been under the focus of scientific studies due to their versatility and the possibility of physical-chemical applications, such as molecular separation by size and shape and catalytic reactions, which so essential in the industrial environment. Zeolites are inorganic solids of the aluminosilicate class, endowed with very high crystallinity, excellent definition of the pore system, high specific area, chemical and hydrothermal stability, and versatility in chemical modification and topology from the alteration of chemical synthesis. Zeolites with Mordenite (MOR) and Faujazite (FAU) topology have a natural origin, however, it is possible to obtain such morphology with desired variations from the hydrothermal synthesis of these materials. Both structures have scientific relevance because they have an extra-large pore opening, formed with a 12-membered ring allowing easy accessibility of heavy molecules into the channel system for subsequent catalytic reactions. This study focused on obtaining zeolites of Faujazite and Mordenite morphology, varying the synthesis parameters to obtain standard samples and samples with a high SiO₂/Al₂O₃ ratio. Zeolite Y FAU high silica was obtained from the use of the organic director (OSDA) tetrabutylammonium hydroxide (TBAOH). High silica MOR zeolite was obtained by changing the molar composition of the gel used in the standard synthesis. The synthesized materials were characterized by X-Ray Diffraction (XRD), X-Ray Fluorescence (XRF), Thermogravimetric Analysis (TG), and Texture Analysis by Nitrogen Adsorption and Desorption. The results demonstrate the correct acquisition of the structures from the diffractograms, showing the characteristic peaks for the referred structures. The FRX analysis demonstrates the increase in the SiO₂/Al₂O₃ ratio guaranteeing the addition of silicon to the lattice. As the next steps for this project, the aim is to obtain microporous carbon per zeolite template (ZTC’s) using the synthesized and previously characterized materials as a matrix for the polymerization of the carbon species and the understanding of the impact of modifying the chemistry of the template material on the obtaining the ZTC's.

COMMITTEE MEMBERS:
Externo à Instituição - ALEXANDER SACHSE - UP
Externa à Instituição - LINDIANE BIESEKI
Interno - 1350249 - RUBENS MARIBONDO DO NASCIMENTO
Presidente - 1308577 - SIBELE BERENICE CASTELLA PERGHER