Banca de QUALIFICAÇÃO: FÁBIO ANDRÉ MOURA NÓBREGA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : FÁBIO ANDRÉ MOURA NÓBREGA
DATE: 13/08/2024
TIME: 09:00
LOCAL: SALA VIRTUAL DO GOOGLE MEET meet.google.com/rnc-goak-xon
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: 75
BIG AREA: Engenharias
AREA: Engenharia Química
SUMMARY:

The reuse of waste produced is a topic of the circular economy, one option would be through hydrotreatment reactions (HDT) which are catalyzed by solids, generally metal oxides or sulfides supported on alumina, silica or activated carbon. In this context, the objective of this work is to synthesize catalysts capable of transforming the Lactose present in whey, a residue from cheese manufacturing, into Lactitol, a dietary sweetener, through hydrogenation of Lactose, present in the whey. For the hydrogenation of Lactose, catalysts based on (Raney Ni), Ru/SiO2 and Pd/Al2O3 are the most used, however new materials have been developed for this purpose. Transition metal carbides were identified as potential candidates for this application, the support of these materials can be an alternative for the catalysis of the reaction. An express method was proposed to support these materials, in comparison to the analytical method. The precursor to obtain Molybdenum Carbide [Mo₂C] was Ammonium Heptamolybdate - Tetra hydrate [(NH₄)₆[Mo₇O₂₄].4H₂O], and to obtain the Nickel Carbide [NiC] two precursors were used: Nickel Nitrate - Hexahydrate [Ni(NO₃)₂.6H₂O] and Nickel Chloride - Hexahydrate [NiCl₂.6H₂O]. These precursors were crushed, manually, in a mass corresponding to 2 (two) grams, prior to the reaction. The precursors were characterized by TG/DTA, SEM/EDS and XRD. The carbides were obtained through a gas-solid reaction with a methane (CH₄) and hydrogen (H₂) atmosphere using a fixed bed reactor. A total gas mixture flow rate of 20L/h with 5% CH₄ and a heating rate of 10°C/min was used, up to the reaction temperature (250 to 800°C). The presence of the Mo2C phase was noted in the carburization at 700°C (orthorhombic) and 750°C (hexagonal) by XRD analysis. The identification of the phase containing NiC by the diffractograms was detected through a gas-solid reaction at a temperature of 500°C. BET analysis for the activated carbon sample indicated a large surface area. The reaction products were characterized by XRD, SEM/EDS and BET. Nickel carbide (NiC) is a material that has been studied for its catalytic properties and potential in various applications, such as: methane reforming, fuel cells, hydrogen production and hydrogenation and dehydrogenation reactions. 

COMMITTEE MEMBERS:
Presidente - 1271737 - CAMILA PACELLY BRANDÃO DE ARAÚJO
Interno - 2929066 - ANDRE LUIS LOPES MORIYAMA
Interno - 349801 - CARLSON PEREIRA DE SOUZA
Externa à Instituição - SUYLAN LOURDES DE ARAÚJO DANTAS