Banca de QUALIFICAÇÃO: YURI KAUA RODRIGUES DE OLIVEIRA SILVA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : YURI KAUA RODRIGUES DE OLIVEIRA SILVA
DATE: 16/05/2023
TIME: 09:00
LOCAL: Auditório do NUPPRAR
TITLE:

Avaliação de catalisadores Ni/Al₂O₃ modificados com B₂O₃ e Cobalto na reação de reforma a seco do metano.

KEY WORDS:

Methane dry reforming; synthesis gas; hydrogen; catalytic promoter; Ni/Al₂O₃

PAGES: 120
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Físico-Química
SPECIALTY: Cinética Química e Catálise
SUMMARY:

The methane dry reforming reaction (RSM) is a synthetic route for the production of synthesis gas starting from a binary gaseous mixture with greenhouse gases (CH₄ and CO₂). the production of syngas from the reforming of biogas that has the same components, with varying ratios of CH₄ and CO₂, the main problem on the subject is the rapid deactivation of the catalysts, mainly due to the high production of inorganic carbon (coke) that encapsulates the active phase particles and compromises long-term conversion. 7 catalysts were planned, prepared and evaluated following the established by the mixture design, of which 1 nickel catalyst (Ni) used as standard, two Ni catalysts promoted by boron trioxide (B₂O₃), 2 bimetallic catalysts in Ni-Cobalt systems (Co) and 2 bimetallic catalysts promoted by B₂O₃, all supported on gamma-alumina. the support was synthesized using the microwave-assisted combustion method using urea as fuel, the metals and the non-metallic promoter were inserted by impregnation via insipid moisture, undergoing a subsequent heat treatment at 550 ºC for three hours. The catalysts were structurally characterized by X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and Field Emission Scanning Electron Microscopy (FEG-SEM) and Energy Dispersive Spectroscopy in the X-Ray Region. X (EDX), the activation of the catalysts was carried out at 700 ºC for one hour under a flow of hydrogen (H₂), the catalytic tests were conducted in a catalytic unit with a fixed bed reactor coupled to a gas chromatograph, the materials were tested during 12 hours with a space velocity of 96 L.g^-1.h^-1, the formed carbon was qualified by Raman spectroscopy and quantified by thermogravimetric analysis. The results indicate high stability, improvement in activity and decrease in coke deposition in the catalysts with the 3 components (Ni, Co and B₂O₃), the statistical modeling shows a high correlation between the varied components and the performance of the catalyst, with boron decreasing considerably the formation of coke and cobalt conferring activity and stability, the proposed special cubic predictive model demonstrates high statistical significance demonstrated by Fisher's test.

COMMITTEE MEMBERS:
Presidente - 349770 - DULCE MARIA DE ARAUJO MELO
Externo ao Programa - 3304576 - RODOLFO LUIZ BEZERRA DE ARAÚJO MEDEIROS - nullInterno - 2087667 - TIAGO PINHEIRO BRAGA