Banca de QUALIFICAÇÃO: CLENILDO DE LONGE

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : CLENILDO DE LONGE
DATE: 06/06/2023
TIME: 08:00
LOCAL: a definir
TITLE:

DEVELOPMENT OF MATERIALS FOR CO2 CAPTURE WITH ZEOLITIC STRUCTURE USING ALTERNATIVE SILICA SOURCE

KEY WORDS:

 Silica MPI; Zeolite-A; ZSM-5; Silicalite, Adsorption; CO₂ Capture

PAGES: 120
BIG AREA: Engenharias
AREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
SPECIALTY: Cerâmicos
SUMMARY:

In recent decades, carbon dioxide capture has attracted attention and different solutions have been proposed, but the global concentration of CO₂ is still increasing along with its environmental impacts. The oil industry has contributed to climate change and is related to greenhouse gas emissions that cause environmental impacts, economic and social problems. Among these technologies, CO₂ capture and storage is considered the most effective solution to reduce CO₂ emissions. Adsorption is the main potential technique among other technologies such as membrane separation and absorption. Among these adsorbents, Zeolite is considered one of the most effective adsorbents in gas adsorption and separation technologies due to its greater adsorption capacity, abundant availability, low cost and cryogenic separation. In this context, the development of materials for CO₂ capture, with zeolite structure using an alternative source of low-cost silica from paria sand, MPI, was evaluated in this work. X-ray diffraction (XRD), X-ray fluorescence (FRX), Fourier transform infrared absorption spectroscopy (FTIR), scanning electron microscopy (SEM), textural analysis of N2 adsorption and desorption and thermal analysis prove that the synthesized silica and zeolites have the structural, morphological, textural and thermal characteristics of these materials. Zeolite-A with MPI silica (ZAM 1h) reached a relative crystallinity of 74.26% in 1 h with pure and crystalline phases. Zeolite ZSM-5 with MPI silica (ZM 15 h) had a relative crystallinity of 92.90% for the time of 15h, with pure and crystalline phases, but smaller crystals than Zeolite with standard silica (ZAP 2 h). Silicalite with MPI silica (SM 3 d) reached a relative crystallinity of 111.90% in 3 days with pure crystalline phases, but with smaller crystals than Zeolite with standard silica (SP 9 d). Standard Zeolite-A and MPI (ZAM 1 h) had the best CO₂ capture results with adsorption capacities of 5.25 mmol/g and 4.83 mmol/g CO₂, respectively. Silicalite had the second best result with the standard (SP 9 d) and MPI (SM 3 d) with capacities of 3.94 mmol/g and 3.78 mmol/g of CO₂, respectively. Standard ZSM-5 (ZMP 3 d) and MPI (ZM 15 h) had capacities of 3.72 mmol/g and 3.22 mmol/g CO₂, respectively. The evaluation of the mathematical models indicated that Zeolite-A fitted better to the Temkin model, ZSM-5 to the Freundlich model, and Silicalite (SP 9 d) and MPI (SM 3d) to Langmuir, and (SM 6 d) to Temkin. The modeling results showed the performance of a preponderant model and concomitant contributions of other models in the adsorptive mechanisms of the Zeolites studied.

COMMITTEE MEMBERS:
Presidente - 1308577 - SIBELE BERENICE CASTELLA PERGHER
Interno - 1298936 - ANTONIO EDUARDO MARTINELLI
Externa ao Programa - ***.566.270-** - LINDIANE BIESEKI - UFRN
Externa ao Programa - 1805556 - LUCIENE DA SILVA SANTOS - UFRN