Influence of Electrostatic Interactions During the Resorcinol-Formaldehyde Polymerization on the Characteristics of Mo-Doped Carbon Gels
Metadatos
Mostrar el registro completo del ítemAutor
Morales Torres, Sergio; Jirglová, Haana; Pastrana Martínez, Luisa María; Maldonado Hodar, Francisco JoséEditorial
MDPI
Materia
Resorcinol-formaldehyde polymerization Surfactants Mo-doping Chemical interactions Carbon xerogels Physicochemical properties Metal nanoparticles
Fecha
2020-06-26Referencia bibliográfica
Morales-Torres, S., Jirglová, H., Pastrana-Martínez, L. M., & Maldonado-Hódar, F. J. (2020). Influence of Electrostatic Interactions During the Resorcinol-Formaldehyde Polymerization on the Characteristics of Mo-Doped Carbon Gels. Processes, 8(6), 746. [doi: 10.3390/pr8060746]
Patrocinador
Spanish Project from ERDF/Ministry of Science, Innovation and Universities-State Research Agency RTI2018-099224-B-I00Resumen
The resorcinol (R)-formaldehyde (F) polymerization was carried out in different
experimental conditions to obtain RF/Mo doped carbon xerogels with different morphology, porosity
and nature and dispersion of metal. Attractive or repulsive electrostatic interactions were forced in the
starting aqueous solution of RF-monomers using different synthesis conditions, namely, combinations
of cationic or anionic surfactants, Mo-precursors and pH values. The results showed that when
both cationic surfactant and Mo-precursor were used at neutral pH, attractive interactions with
the anionic RF-macromolecules are favored during polymerization and the final carbon xerogel
exhibited the most developed porosity and the strongest Mo-organic phase interaction, leading to
deeper Mo-phase reduction during carbonization and the formation of highly-dispersed crystalline
nanoparticles of Mo2C. On the contrary, the use of both anionic surfactant and Mo-precursor leads
to repulsive interactions, which generates less porous carbon gels with a Mo-phase formed by
large MoO3 platelet structures and low Mo-surface contents. RF/Mo-doped gels with intermediate
properties were obtained by combining cationic and anionic surfactants, metal precursors or both.
After carbonization, the obtained materials would be suitable to be used directly as catalysts with
different physicochemical properties and active phases.