Iron modified mesoporous materials as catalysts for ODS of sulfur compounds.
Date
2018
Journal Title
Journal ISSN
Volume Title
Publisher
Univesidsad Tecnológica Nacional.
Abstract
Se aplicaron catalizadores mesoporosos modificados con Fe en la reacción de ODS de DBTs, utilizando H2O2
como oxidante y acetonitrilo como solvente. Los soportes utilizados fueron SBA-15, MCM-48, CMK-3 y
CMK-1.El hierro se incorporó mediante impregnación húmeda utilizando nitrato de hierro. Los catalizadores
se caracterizaron por XRD, isotermas de N2, TEM, XPS e ICP. Hemos desarrollado catalizadores con gran
área específica y volumen de poro, distribución estrecha del tamaño de mesoporos y especies de hierro
altamente dispersas. Se probaron los catalizadores en desulfuración oxidativa de diferentes compuestos de
azufre tales como benzotiofeno (BT), dibenzotiofeno (DBT) y 4,6-dimetil dibenzotiofeno 4,6-DMDBT). El
catalizador preparado con CMK-3 como soporte fue el más activo para la reacción de ODS. La buena actividad
se relacionó con la elevada dispersión de óxidos de hierro, principalmente en la fase magnetita. En la oxidación
de DBT y utilizando Fe-CMK-3 se estudiaron la temperatura, peróxido de hidrogeno y concentración inicial
de azufre. Se determinaron las condiciones óptimas de operación. Fe-CMK-3 es un catalizador activo y estable
para ser aplicado en el proceso industrial de ODS.
Palabras clave: SBA-15, MCM-48, CMK-3, CMK-1, Fe.
Fe-modified mesoporous catalysts were used in the ODS of DBTs using H2O2 as oxidant and acetonitrile as solvent. SBA-15, MCM-48, CMK-3 and CMK-1 were used as supports. Iron was incorporated using iron nitrate by wetness impregnation. The catalysts were characterized by XRD, N2 isotherms, TEM, XPS and ICP. We developed catalysts with high specific surface area, pore volume and narrow mesopore size distribution and highly dispersed Fe-species. The catalysts were tested in the oxidative desulfurization of different sulfur compounds as benzothiophene (BT), dibenzothiopene (DBT) and 4,6-dimethyl dibenzothiopene (4,6- DMDBT). The catalyst prepared using CMK-3 as support was the most active for the ODS reaction. The good activity was related with the high dispersion of the iron oxides, mainly in the magnetite phase. Temperature, hydrogen peroxide and sulfur initial concentration were studied using Fe-CMK-3 in the oxidation of DBT. The optimal operation conditions were determined. Fe-CMK-3 is an active and stable catalyst to be applied in the industrial process of ODS. Keywords: SBA-15, MCM-48, CMK-1, CMK-3, Dibenzothiophene, Fe.
Fe-modified mesoporous catalysts were used in the ODS of DBTs using H2O2 as oxidant and acetonitrile as solvent. SBA-15, MCM-48, CMK-3 and CMK-1 were used as supports. Iron was incorporated using iron nitrate by wetness impregnation. The catalysts were characterized by XRD, N2 isotherms, TEM, XPS and ICP. We developed catalysts with high specific surface area, pore volume and narrow mesopore size distribution and highly dispersed Fe-species. The catalysts were tested in the oxidative desulfurization of different sulfur compounds as benzothiophene (BT), dibenzothiopene (DBT) and 4,6-dimethyl dibenzothiopene (4,6- DMDBT). The catalyst prepared using CMK-3 as support was the most active for the ODS reaction. The good activity was related with the high dispersion of the iron oxides, mainly in the magnetite phase. Temperature, hydrogen peroxide and sulfur initial concentration were studied using Fe-CMK-3 in the oxidation of DBT. The optimal operation conditions were determined. Fe-CMK-3 is an active and stable catalyst to be applied in the industrial process of ODS. Keywords: SBA-15, MCM-48, CMK-1, CMK-3, Dibenzothiophene, Fe.
Description
Keywords
SBA-15-MCM-48, CMK-3, CMK-1, Fe
Citation
CICAT 2028, 50 Aniversario- XXVI Congresso Ibero-Americano de Catálise Coimbra.
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