Banca de QUALIFICAÇÃO: GABRIELA MAGALHÃES MAIA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : GABRIELA MAGALHÃES MAIA
DATE: 18/03/2022
TIME: 14:00
LOCAL: Forma Remota
TITLE:

SYNTHESIS OF TITANIUM DOPED METALLORGAN NETWORKS FOR OXIDATIVE DESULFURIZATION OF FOSSIL FUELS

KEY WORDS:

Petróleo, compostos organossulfurados, refino, dessulfurização oxidativa, catalisadores heterogêneos, redes metalorgânicas, UiO-66, dopagem com titânio

PAGES: 40
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Química Inorgânica
SUMMARY:

The invention of gasoline and diesel engines and technological advances for drilling wells intensified the exploration and use of oil. In 2014, the world consumption of oil was 99,843,000 barrels/day and its use as fuel corresponded to 39.9% of the world energy matrix, with 79.8% coming from the industrial sector. In addition to carbon dioxide, the combustion of oil releases sulfur compounds into the environment that are present in its original matrix. From an environmental standpoint, these substances are lung irritants, harmful to those with respiratory illness, and form sulfuric acid aerosols that contribute to acid rain and are corrosive. In economic terms, sulfur compounds can promote corrosion of engines and metallic parts of cars and equipment and deactivate the catalysts that help reduce the emission of these atmospheric pollutants during oil refining. There is a worldwide trend to tighten the permitted sulfur levels in fuel oils. During oil refining, there is the hydrodesulphurization process (HDS) which aims to convert heavy raw materials into products with a lower boiling point and, as a consequence, there is a reduction in the sulfur content. However, the chemical reaction involved in the process uses hydrogen gas and catalyst under drastic operating conditions of temperature and pressure, increasing the operating cost. In this context, oxidative desulfurization (ODS) emerges as an innovative technology for producing diesel with low sulfur contents under milder conditions. Chemical reactions in ODS transform the sulfur compounds into sulfones, which have higher polarity than the former and, thus, the removal process is facilitated. For this to occur it is necessary the presence of an oxidizing agent, such as hydrogen peroxide, and a catalyst. Heterogeneous catalysts are promising in this regard, due to their stability, easy separation from the reaction medium, lower cost when compared to homogeneous catalysts, and applicability in non-mild operating conditions. Metal-organic networks (MOF - metal-organic framework) are crystalline solid materials with high porosity formed by a strong bond between metal ion and organic binder. MOF UiO-66, composed of a metallic zirconium center and an organic terephthalic acid binder in an octahedral geometry, presents active Lewis acid and redox sites, in addition to pores that are used as host matrix. Thus, MOF UiO-66 is an interesting material to evaluate its catalytic activities in oxidative desulfurization processes. Thus, the general objective of this work is to synthesize UiO-66 type metalorganic networks aiming at the oxidative desulfurization of a simulated petroleum matrix using hydrogen peroxide as an oxidizing agent and diobenzothiophene as a sulfur compound to be oxidized. It is also aimed at the synthesis and characterization of pure material and doped with different percentages of titanium. As a result, it will be possible to evaluate the application of UiO-66 as a catalyst for the removal of sulfur compounds in oxidative desulfurization processes and the influence of titanium content on the material's catalytic activity.

BANKING MEMBERS:
Presidente - EMERSON FERNANDES PEDROSO
Externa ao Programa - DIANA QUINTAO LIMA