Banca de DEFESA: AMANDA MENEZES CALDAS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : AMANDA MENEZES CALDAS
DATE: 09/12/2024
TIME: 10:00
LOCAL: Auditório do NUPPRAR
TITLE:

Green synthesis of ZSM-5 zeolite assisted by microwave and application in the catalytic pyrolysis route of frying oil and beef talow

KEY WORDS:

biofuels; zeolite; ZSM-5; HZSM-5; Ni/HZSM-5; frying oil; beef tallow; catalytic pyrolysis

PAGES: 111
BIG AREA: Engenharias
AREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
SPECIALTY: Cerâmicos
SUMMARY:

The current energy transition has led to the search for efficient biomass conversion processes, where catalysis plays a fundamental role, enabling the production of high value-added products, such as biofuels. Zeolitic materials are among the solid acid catalysts widely explored in the industry, including petrochemicals, due to their high activity, selectivity and thermal stability. In this class, zeolite ZSM-5 stands out, which has a porous structure, which gives it the characteristics of a molecular sieve, capable of selectively adsorbing molecules. The hydrothermal process is the most commonly used for the synthesis of this catalyst, where crystallization times of up to 72 hours are reported, in addition to the use of organic directing agents and/or seeds to obtain the crystalline structure. Based on this, this work explored an innovative method without organic directing and without seeds, assisted by microwaves, to obtain zeolite ZSM-5. The method allowed the formation of the crystalline structure in a period of 1 to 10 hours, depending on the conditions, and proved to be an efficient alternative by providing savings in time, reagents, energy and total costs. The applicability of the catalyst was explored for the thermal conversion of residual biomass from frying oil and beef tallow from the catalytic pyrolysis process, in their protonated (HZSM-5) and nickel-impregnated (Ni/HZSM-5) forms. The samples were characterized, allowing to confirm the formation of the highly stable orthorhombic structure, in addition to the preservation of the structure after the proposed modifications. The proposed kinetic studies (OFW and KAS) demonstrated the decrease in activation energies (Ea) provided by the catalyzed thermal processes, when compared to the non-catalytic results. The results obtained from the catalytic pyrolysis tests confirmed the improved performance of the HZSM-5 and Ni/HZSM-5 catalysts for the cracking of hydrocarbon fractions and deoxygenation, confirming that they are promising for obtaining products with high added value. In addition, the impregnated catalyst revealed the strong influence of the transition metal (Ni) for deoxygenation, increasing the activity of the protonated zeolite. Thus, the work is presented in order to contribute to the waste stream and, simultaneously, to sustainable development through catalytic processes.

COMMITTEE MEMBERS:
Interna - 349770 - DULCE MARIA DE ARAUJO MELO
Externa ao Programa - 2140818 - AMANDA DUARTE GONDIM - UFRNExterna à Instituição - ARUZZA MABEL DE MORAIS ARAUJO - UFRN
Externa à Instituição - FABÍOLA CORREIA DE CARVALHO