Banca de DEFESA: FÁBIO ANDRÉ MOURA NÓBREGA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : FÁBIO ANDRÉ MOURA NÓBREGA
DATE: 30/09/2024
TIME: 09:00
LOCAL: Sala da Secretaria Integrada de Pós-Graduação do Centro de Tecnologia da UFRN
TITLE:

SYNTHESIS OF Mo2C AND NiC USING A FIXED BED REACTOR AND THEIR EXPRESS IMPREGNATION IN ACTIVATED CARBON

KEY WORDS:

Molybdenum Carbide, Nickel Carbide, Support, Activated Carbon.

PAGES: 89
BIG AREA: Engenharias
AREA: Engenharia Química
SUMMARY:

The circular economy has been used as one of the main solutions for reducing environmental impacts. The reuse of waste produced in the most varied industrial activities can occur in several ways, one of which can be through hydrotreatment reactions (HDT) which are catalyzed by solids, generally metal oxides or sulfides normally supported on alumina, silica or activated carbon. In this context, the objective of this work is to synthesize catalysts capable of hydrogenating carbohydrates or hydrocarbons. Examples include the hydrogenation of Lactose, present in whey, a residue from cheese manufacturing, into Lactitol and the hydrogenation of glycerol, present in biodiesel, a residue from its manufacture, into propylene glycol. An express method was proposed to support these materials, in relation to the analytical method. The precursor to obtain Molybdenum Carbide [Mo2C] was Ammonium Heptamolybdate - Tetra hydrate [(NH4)6[Mo7O24].4H2O], and to obtain Nickel Carbide [NiC] two precursors were used: Nickel - Hexahydrate [Ni(NO3)2.6H2O] and Nickel Chloride - Hexahydrate [NiCl2.6H2O]. The precursors were characterized by TG/DTA, SEM/EDS and XRD. The carbides were obtained through a gas-solid reaction with an atmosphere of methane (CH4) and hydrogen (H2) using a fixed bed reactor. A total gas mixture flow rate of 20L/h was used with 5% CH4 and a heating rate of 10°C/min, up to the reaction temperature (500 to 800°C). The presence of a Mo2C phase was noted in the carburization at 700°C (orthorhombic) and 750°C (hexagonal) in a 1h isotherm. The identification of the phase containing NiC (cubic) by the diffractograms was detected through a gas-solid reaction with an atmosphere of methane (CH4) and hydrogen (H2) at a temperature of 500°C in the presence of CAP and at 800°C in a 3h isotherm. BET analysis for the samples supported on CAP indicated a large surface area. The reaction products were characterized by XRD, SEM/EDS and BET. The synthesis of transition metal carbides, such as molybdenum carbide (Mo2C) and nickel carbide (NiC), has attracted great interest due to their unique catalytic properties. These materials have potential for diverse industrial applications, including methane reforming, fuel cells, hydrogenation and dehydrogenation reactions. The search for efficient and sustainable methods for producing these catalysts is an active field of research in chemical engineering. The NiC synthesis methodology is an innovation in scientific literature.

COMMITTEE MEMBERS:
Interno - 2929066 - ANDRE LUIS LOPES MORIYAMA
Presidente - 1271737 - CAMILA PACELLY BRANDÃO DE ARAÚJO
Interno - 349801 - CARLSON PEREIRA DE SOUZA
Externa ao Programa - 3352345 - MARIA JOSE SANTOS LIMA - nullExterna à Instituição - SUYLAN LOURDES DE ARAÚJO DANTAS
Externo ao Programa - ***.121.804-** - UILAME UMBELINO GOMES - UFRN