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

Cuadrado-Collados, Carlos; Farrando-Pérez, Judit; Escandell, Manuel Martínez; Ramírez-Montoya, Luis A.; Menéndez, J.Á.; Arenillas, A.; Montes-Morán, Miguel A.; Silvestre-Albero, Joaquín

doi:10.1016/j.cej.2020.126276

Cited by 23 publications

(10 citation statements)

References 24 publications

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“…The concept of “nanoreactors” should theoretically work. Significant work in the synthesis of novel materials has been done by researchers worldwide, notably by Silvestre-Albero and co-workers, ,, for developing efficient gas storage in confined spaces. In addition, it was shown recently that altering the surface wettability of porous materials could strongly enhance the formation of methane hydrates. , Hence, the concept of “nanoreactors” offers a theoretical basic for tailoring porous materials to achieve a better promotion of gas hydrate formation.…”

Section: H2 Hydrate Formation In Confined Spaces and “Nanoreactors”mentioning

confidence: 99%

“…Besides KHPs, functional porous materials present a promising strategy for boosting gas hydrate formation. The effects of confinements have been investigated intensively for methane and CO 2 hydrates. − Recently, Farrando-Perez et al reported a rapid formation of hydrogen hydrate in confined nanospaces, showing great promise for hydrogen storage via confined hydrates . Experimental progress in confined gas hydrates, including hydrogen, methane, and CO 2 hydrates, has been discussed in the literature. ,− Hence, we will focus on the fundamental aspects of the formation of confined gas hydrates.…”

Section: H2 Hydrate Formation In Confined Spaces and “Nanoreactors”mentioning

confidence: 99%

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Prospect and Challenges of Hydrate-Based Hydrogen Storage in the Low-Carbon Future

Nguyen

2023

Energy Fuels

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Hydrogen hydrate is a promising material for safe and potentially cost-effective hydrogen storage. In particular, hydrogen hydrate has potential for applications in large-scale stationary energy storage to dampen the temporal variation of renewable energy, for example, in the form of hydrogen-ready gasfired power plants for generating energy when the renewable power is not available. Preliminary SWOT (strengths, weaknesses, opportunities, threats) analysis indicates that such hydrate-based hydrogen storage (HBHS) has intrinsic competitive edges. However, while the theoretical hydrogen density of the hydrate could reach ∼5 wt %, experiments have not achieved such a high hydrogen storage capacity under practical conditions. This low gravimetric hydrogen density, plus the slow kinetics of hydrogen inclusion in the hydrate, presents an outstanding challenge for commercializing the HBHS. Future research is urged to resolve both the gaps in knowledge and technological barriers for realizing this unconventional technology. Particular future directions include the elucidation of the working mechanism of hydrate promoters, rational designs of new promoters, upscaled experiments and demonstrations, the assessment of long-term stability of hydrogen hydrates, and systematic SWOT analysis. This paper offers an insightful view of the HBHS in low-emission economies.

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Section: H2 Hydrate Formation In Confined Spaces and “Nanoreactors”mentioning

confidence: 99%

Section: H2 Hydrate Formation In Confined Spaces and “Nanoreactors”mentioning

confidence: 99%

Prospect and Challenges of Hydrate-Based Hydrogen Storage in the Low-Carbon Future

Nguyen

2023

Energy Fuels

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“…Rapid gas hydrate formation in nanoreactors has been well documented. − Examples of common confined spaces are carbon-based pore structures, metal–organic frameworks (MOFs), silica gels, and porously packed beds. − Among these, porous carbon-based structures have been of great interest owing to their high capability for promoting gas enclathration. ,, For example, Borchardt et al indicated that prewetted model mesopore carbons (pore diameter ϕ ≈ 25 nm) could adsorb 341 mg CH 4 per gram of wet carbons at −9 °C and 6 MPa, marking a much higher adsorption capacity compared to 163 mg/g for micropore carbons (ϕ ≈ 0.8 nm) and 61 mg/g for macropore carbons (ϕ ≈10 μm) under similar experimental conditions (Figure ). Using synchrotron X-ray diffraction, the authors confirmed that the superior methane uptake in mesopore carbons was given by methane hydrate formation with a composition of 1CH 4 ·(6.3)H 2 O …”

Section: Nanoreactors – the Enabler Of Fast Gas Enclathrationmentioning

confidence: 99%

“Nanoreactors” for Boosting Gas Hydrate Formation toward Energy Storage Applications

Nguyen

2022

ACS Nano

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Hydrogen and methane can be molecularly incorporated in ice-like water structures up to mass fractions of 4.3% and 13.3%, respectively. The resulting solid structures, called gas hydrates, offer great potential for the efficient storage of hydrogen and natural gas. However, slow gas encapsulation by bulk water hinders this application. Porous structures have been shown to effectively promote gas hydrate formation and are a potential enabler for the development of hydrate-based gas storage technologies. Here, we offer an insightful perspective on using porous structures as nanoreactors for achieving fast gas hydrate formation for gas storage applications. We critically discuss and elucidate the working mechanisms of nanoreactors and identify the criteria for efficient nanoreactors. Based on the concepts founded, we propose a theoretical framework for designing next-generation porous materials for delivering better promoting effects on gas hydrate formation.

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“…Attractive characteristics as accelerating additives could also be found in non-conductive materials, but their performance as IET promotors has been poorly studied and the few reports available show marginal benefits on AD processes [12][13][14] . Organic xerogels (OX) have emerged as versatile nonconductive materials, which have been explored in several industrial applications, such as a host structure for methane hydrate formation 15 and protein adsorption 16 , as well as for their use as desiccant 17 or thermal insulator 18 , due to their enriched and modifiable chemical surface, tunable porosity, high reproducibility, high purity, scalability and low-cost production [19][20][21][22] .…”

Section: Introductionmentioning

confidence: 99%

Enhanced anaerobic treatment of synthetic protein-rich wastewater promoted by organic xerogels

et al. 2022

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BACKGROUND: Carbon-based materials have been shown to enhance anaerobic digestion (AD) processes by promoting direct interspecies electron transfer in methanogenic consortia. However, little is known on their effects during the treatment of complex substrates, such as those derived from proteinrich wastewaters. Here, organic xerogels (OX) are tested, for the first time, as accelerators of the methanogenic activity of an anaerobic consortium treating a synthetic protein-rich wastewater.RESULTS: Three OX with distinct pore size distribution (10 and 1000 nm for OX-10 and OX-1000, respectively) and structural conformation (graphene oxide (GO) incorporation for OX-10-GO) were synthesized. OX-1000 promoted the highest methane production rate (5.21 mL/g*h, 13.5% increase with respect to the control incubated without OX) among the synthesized OX. Additionally, batch bioreactors amended with OX achieved higher chemical oxygen demand (COD) removal (up to 88%) as compared to the control, which only showed 50% of COD removal. Interestingly, amendment of bioreactors with OX also triggered the production of medium-chain fatty acids, including caprylate and caproate. Moreover, OX decreased the accumulation of ammonium, derived from proteins hydrolysis, probably due to their adsorption capacities. CONLUSIONS: For the first time, OX were successfully applied as methanogenic accelerators for the anaerobic treatment of synthetic protein-rich wastewater. Addition of OX increased the methane production rate and COD removal as well as triggering the production of medium chain fatty acids and attenuating the accumulation of ammonium. Therefore, OX are proposed as suitable materials to boost the efficiency of anaerobic systems to treat complex industrial wastewaters.

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

Cited by 23 publications

References 24 publications

Prospect and Challenges of Hydrate-Based Hydrogen Storage in the Low-Carbon Future

Prospect and Challenges of Hydrate-Based Hydrogen Storage in the Low-Carbon Future

“Nanoreactors” for Boosting Gas Hydrate Formation toward Energy Storage Applications

Enhanced anaerobic treatment of synthetic protein-rich wastewater promoted by organic xerogels

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