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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Cool, Pegie
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (9/9 displayed)
- 2024Structure I methane hydrate confined in C8-grafted SBA-15citations
- 2022Use of nanoscale carbon layers on Ag-based gas diffusion electrodes to promote CO productioncitations
- 2015Hydrothermally synthesized BaTiO3 textured in a strong magnetic fieldcitations
- 2013Hierarchical materials originated from mesoporous MCF material and Beta zeolite nanoparticles : synthesis and catalytic activity in $N_2O$ decompositioncitations
- 2013Synthesis and characterization of catalytic metal semiconductor-doped siliceous materials with ordered structure for chemical sensoringcitations
- 2013Investigation on the Low-Temperature Transformations of Poly(furfuryl alcohol) Deposited on MCM-41citations
- 2012Thermal transformation of polyacrylonitrile deposited on SBA-15 type silica : effect on adsorption capacity of methyl-ethyl ketone vaporcitations
- 2011Removal of methyl-ethyl ketone vapour on polyacrylonitrile-derived carbon/mesoporous silica nanocomposite adsorbentscitations
- 2011The benefit of glass bead supports for efficient gas phase photocatalysis: Case study of a commercial and a synthesised photocatalystcitations
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article
Structure I methane hydrate confined in C8-grafted SBA-15
Abstract
<p>Confinement of water and methane in mesopores of hydrophobized SBA-15 is demonstrated to promote methane hydrate formation. In comparison to as-synthesized SBA-15, hydrophobization by C<sub>8</sub> grafting accelerates the kinetics of methane storage in and delivery from the hydrate. C<sub>8</sub> grafting density was determined at 0.5 groups nm<sup>−2</sup> based on TGA and quantitative NMR spectroscopy. Multinuclear <sup>1</sup>H-<sup>1</sup>H DQSQ and <sup>1</sup>H-<sup>1</sup>H RFDR NMR provided spectroscopic evidence for the occurrence of C<sub>8</sub> chains inside the mesopores of SBA-15, by showcasing close spatial proximity between the grafted C<sub>8</sub> chains and pore-intruded water species. X-ray diffraction demonstrates formation of Structure I hydrate on SBA-15 C<sub>8</sub>. At 7.0 MPa and 248 K, the water-to-hydrate conversion on hydrophobized SBA-15 C<sub>8</sub> reaches 96% as compared to only 71% on a pristine SBA-15 sample with comparable pore size, pore volume and surface area. The clathrate loading amounted to 14.8 g/g. 2D correlation NMR spectroscopy (<sup>1</sup>H-<sup>13</sup>C CP-HETCOR, <sup>1</sup>H-<sup>1</sup>H RFDR) reveals hydrate formation occurs within pores of SBA-15 C<sub>8</sub> as well as in interparticle volumes. Following the initial crystallization of SBA-15 C<sub>8</sub>-supported methane hydrate taking several hours, a pressure swing process at 248 K allows to desorb and re-adsorb methane from the structure within minutes and without thawing the frozen water structure. Fast loading and unloading of methane was achieved in 19 subsequent cycles without losses in kinetics. The ability to harvest the gas and regenerate the structure without the need to re-freeze the water represents a 50% energy gain with respect to melting and subsequently recrystallizing the hydrate at 298 K and 248 K, respectively. After methane desorption, a small amount of residual methane hydrate in combination with an amorphous yet locally ordered ice phase is observed using <sup>13</sup>C and <sup>2</sup>H NMR spectroscopy. This effect offers an explanation for the enhanced hydrate formation kinetics in adsorption-desorption cycles. These findings open new perspectives for clathrate hydrate-based methane storage.</p>