Banca de DEFESA: TATIANE DE JESUS SANTOS

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : TATIANE DE JESUS SANTOS
DATE: 25/10/2023
TIME: 14:00
LOCAL: Sala de Seminários do Instituto de Química
TITLE:

USE OF GRAVEL FROM DRILLING OIL AND GAS WELLS FOR SUSTAINABLE PRODUCTION OF ZEOLITES APPLIED IN CO2 CAPTURE

KEY WORDS:

Drilling gravel, sustainability, molecular sieves, Zeolite, CO2 capture.

PAGES: 133
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUMMARY:

Given the environmental problems and risks to human health associated with the generation and disposal of drilling cuttings from oil and gas wells, the development of new alternatives for using this waste is of great importance. In addition to the various studies on the use of gravel for the production of materials for civil construction, an innovative and promising alternative consists of studying gravel as a raw material for the production of value-added aluminous-silice materials, such as zeolites. , which can be used as adsorbents in the chemical industry. Thus, in this study drilling gravel with water-based fluid residue was used and the characterization of this material indicated that it was a heterogeneous residue of clayey nature and compact structure, with SiO2 and Al2O3 contents of 52.91 and 17.95 % respectively, which suggest the possibility of using it as a source of silicon and aluminum. Additionally, it was observed that the silicon oxide present in the residue is mainly in the form of quartz, which indicated the need for a synthesis method with appropriate conditions for solubilizing this highly stable phase. Thus, the synthesis procedure used consisted of three steps: hydrothermal treatment of the gravel in 8M NaOH solution at 240°C for 5h, with the formation of hydroxycancrinite; solubilization of hydroxycancrinite with concentrated HCl under stirring and heating with subsequent addition of the recycled alkaline liquid from the first stage and, finally, hydrothermal treatment at 100°C for 1h, 12h, 1d, 2d, 3d, 5d and 7d. The characterization results of the synthesized materials showed that the hydrothermal treatment time of 2 days, in the last synthesis stage, was the ideal condition for the synthesis of high purity Faujasite-type zeolite X, with high pore area and volume values. Knowing that there is a great environmental concern related to CO2 emissions, the main responsible for global warming, and that zeolite TSA and PSA methodologies. The results obtained indicated that material 2d presented a high CO2 adsorption capacity (9.75 mmol/g at 0°C, 8.05 mmol/g at 25°C, 6.99 mmol/g at 50°C and 3.97 mmol /g at 75°C), performance superior to that reported in the literature for zeolite X synthesized from other residues. Additionally, the synthesized material showed stable adsorption capacity and could be successfully reused for CO2 adsorption at the temperatures and pressures studied.

COMMITTEE MEMBERS:
Presidente - 2362069 - RAILDO ALVES FIUZA JUNIOR
Interno - 2356272 - ARTUR JOSE SANTOS MASCARENHAS
Interna - 3156252 - LUIZA AMIM MERCANTE
Interna - 1299469 - LUCIANA ALMEIDA DA SILVA
Interna - 282610 - HELOYSA MARTINS CARVALHO ANDRADE
Externo ao Programa - 1523793 - SILVIO ALEXANDRE BEISL VIEIRA DE MELO - UFBAExterna à Instituição - SUZANA MODESTO DE OLIVEIRA BRITO - UEFS
Externa à Instituição - TEREZA SIMONNE MASCARENHAS SANTOS - UEFS