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Well-defined meso/macroporous materials as a host structure for methane hydrate formation: Organic versus carbon xerogels

AuthorsCuadrado-Collados, C.; Farrando-Pérez, J.; Martínez-Escandell, M.; Ramírez Montoya, Luis Adrián ; Menéndez Díaz, José Ángel ; Arenillas de la Puente, Ana ; Montes Morán, Miguel Ángel ; Silvestre-Albero, J.
Gas hydrates
Confinement effects
Porous structure
Surface chemistry
Issue Date16-Jul-2020
CitationChemical Engineering Journal 402: 126276 (2020)
AbstractA series of xerogels with a properly designed porous structure and surface chemistry have been synthesized and evaluated as a host structure to promote the nucleation and growth of methane hydrates. Organic xerogels (OGs) have been synthesized from resorcinol-formaldehyde mixtures using a sol-gel approach and microwave heating. These xerogels are hydrophilic in nature and possess designed meso/macrocavities in the pore size range 5–55 nm. Carbon xerogels (CGs) have been synthesized from their organic counterparts after a carbonization treatment at high temperature. Interestingly, the carbonization process does not alter/modify substantially the porous network of the parent xerogels, while developing new micropores. Under water-supplying conditions, the two types of xerogels exhibit a large improvement in the methane adsorption capacity compared to the pure physisorption process taking place in dry conditions (up to 200% improvement), and associated with a significant hysteresis loop. These excellent values must be associated with the promoting effect of these xerogels in the water-to-hydrate conversion process. The comparison of OGs and CGs as a host structure anticipates that surface chemistry, total pore volume and pore size are critical parameters defining the extent and yield of the methane hydrate formation process.
Publisher version (URL)https://doi.org/10.1016/j.cej.2020.126276
Appears in Collections:(INCAR) Artículos
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