Fast synthesis of micro/mesoporous xerogels: Textural and energetic assessment
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Otros documentos de la autoría: Isaacs Páez, Elisabeth; Haro, Marta; Juarez-Perez, Emilio J.; Jiménez Carmona, Rocío; Parra Soto, José Bernardo; Leyva Ramos, Roberto; Ovín Ania, María Concepción
Metadatos
Mostrar el registro completo del ítemcomunitat-uji-handle:10234/9
comunitat-uji-handle2:10234/2507
comunitat-uji-handle3:10234/6973
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INVESTIGACIONMetadatos
Título
Fast synthesis of micro/mesoporous xerogels: Textural and energetic assessmentAutoría
Fecha de publicación
2015Editor
ElsevierISSN
1387-1811Cita bibliográfica
ISAACS PÁEZ, Elizabeth, et al. Fast synthesis of micro/mesoporous xerogels: Textural and energetic assessment. Microporous and Mesoporous Materials, 2015, vol. 209, p. 2-9.Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
http://www.sciencedirect.com/science/article/pii/S1387181114006131Versión
info:eu-repo/semantics/submittedVersionPalabras clave / Materias
Resumen
The sol–gel polymerization of resorcinol/formaldehyde mixtures to obtain porous gels is typically a long process performed throughout several days. In this work, we have explored an experimental approach to reduce the ... [+]
The sol–gel polymerization of resorcinol/formaldehyde mixtures to obtain porous gels is typically a long process performed throughout several days. In this work, we have explored an experimental approach to reduce the time necessary to obtain porous gels based on mild polymerization conditions and direct drying. We have analyzed the effects of the temperature and time of the gelation/aging step on the porosity of the gels, as well as the impact on the overall energetic cost of the process. Data have shown that well-developed micro–mesoporous architectures can be obtained within less than a day. The temperature of the gelation/aging step mainly affects the mesopore network, whereas the microporosity is determined by the composition of the precursor’s mixture. The exclusion of the solvent exchange step yields soft mechanically fragile porous gels with structural limitations upon carbonization at high temperature in inert atmosphere, due to the surface tensions applied to the backbone during the evolution of volatiles. The mesopore structure lost during carbonization is not recovered upon activation in CO2 atmosphere, but it is preserved upon chemical activation in K2CO3 and the resulting gel exhibits a bimodal micro–mesoporous distribution. Furthermore, the energy savings of this route are similar to those obtained using microwave-heating in terms of grams of xerogel per kilowatt hour of energy consumed for similar textural properties. The correlation between the energy power consumed and the textural parameters is a useful tool to optimize the synthesis. [-]
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Microporous and Mesoporous Materials, 2015, vol. 209Derechos de acceso
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