Banca de QUALIFICAÇÃO: ARYANDSON DA SILVA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : ARYANDSON DA SILVA
DATE: 21/11/2022
TIME: 14:00
LOCAL: videoconferência
TITLE:

CO2 adsorption on LTA zeolites.

KEY WORDS:

Zeolite, CO2 adsorption, physisorption, cation exchange, residues.

PAGES: 95
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Química Inorgânica
SPECIALTY: Determinação de Estrutura de Compostos Inorgânicos
SUMMARY:

Currently, CO2 is the main greenhouse gas, mainly because it is easily obtained in combustion processes, which is the main form of energy conversion used by humanity and the amount of gas emitted into the atmosphere has increased over time. For years, in this way, studies that aim to mitigate or end emissions have been increasingly present in the scientific community. LTA zeolites synthesized from different sources of silicon were then compared, cation exchange was performed in these materials, they were then characterized by X-ray diffraction (XRD), X-ray fluorescence (XRF), textural properties analysis by adsorption and argon desorption at 77K and then applied to CO2 adsorption. From the XRD and XRF it was possible to observe the formation of the characteristic crystalline phases of LTA zeolite, as well as to confirm the cation exchange process. Analyzing the isotherm of adsorption and desorption of argon at 77K, it was seen that the area of the materials increased considerably when carrying out the cation exchange, and this significantly influenced the adsorption of CO2, as it was possible to observe by the isotherms, where the materials containing calcium absorbed a greater amount than materials in the sodium form. It is also possible to observe that the selectivity of the materials is also influenced by the cation present in the structure.

COMMITTEE MEMBERS:
Externo à Instituição - FABIO GARCIA PENHA - IFRN
Interna - 1805556 - LUCIENE DA SILVA SANTOS
Externa à Instituição - MARIELE IARA SOARES DE MELLO - UFRN
Presidente - 1308577 - SIBELE BERENICE CASTELLA PERGHER