Banca de DEFESA: DARLLEN GUIMARÃES DA SILVA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : DARLLEN GUIMARÃES DA SILVA
DATE: 03/07/2023
TIME: 14:00
LOCAL: Sala de seminários do IQ
TITLE:

CO2-assisted methanol conversion over V/H-ZSM-5 catalysts


KEY WORDS:
Methanol conversion; use of CO2; bifunctional catalysts; V/H-ZSM-5.

PAGES: 150
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Química Inorgânica
SUMMARY:
Carbon dioxide assisted methanol conversion was studied on V/H-ZSM-5 bifunctional catalysts. The catalysts were prepared by wet impregnation of NH4VO3 on H-ZSM-5 (Zeolyst, SiO2/Al2O3 = 23) in order to obtain vanadium contents of 1.0, 2.5 and 5.0%. The catalysts were tested in methanol conversion assisted by O2 or CO2 as oxidizing agent. In inert medium (He atmosphere) it was observed that the catalysts lead to the selective production of DME (X = 74.4%, Y = 55.4%), at a temperature of 220°C. In the presence of O2 (CH3OH/O2 = 3:1) preferential formation of DMM (X = 84.1%, Y = 49.5%) is observed at a temperature of 220°C, but there is formation of small amounts of other by-products (dimethyl ether, formaldehyde, methyl formate, CO and CO2). Furthermore, partial deactivation of the catalyst due to the formation of carbonaceous deposits is observed. When assisted by CO2 (CH3OH/CO2 = 3:1) DMM formation (X = 83.8%, Y = 62.3%) is observed at the same temperature and a CO2 conversion of 4.2%, without significant losses of activity with the reaction time and a formation of only 2.6% of carbonaceous residues. The formation of other products only occurs at temperatures above 240°C. An increase in DMM yield is observed with increasing vanadium content up to 5%.


COMMITTEE MEMBERS:
Interna - 1488945 - ADRIANE VIANA DO ROSARIO
Interno - 2356272 - ARTUR JOSE SANTOS MASCARENHAS
Interno - 1551430 - FABIO DE SOUZA DIAS
Presidente - 282610 - HELOYSA MARTINS CARVALHO ANDRADE
Interna - 1299469 - LUCIANA ALMEIDA DA SILVA
Externo à Instituição - RODRIGO DE PAULA
Externa à Instituição - TEREZA SIMONNE MASCARENHAS SANTOS - UEFS
Interna - 1861434 - VALERIA CRISTINA FERNANDES
Notícia cadastrada em: 27/04/2023 13:00
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