Hydrogen storage in CO2-activated amorphous nanofibers and their monoliths

Kunowsky, Mirko; Marco-Lozar, J.P.; Ōya, Asao; Linares-Solano, Á.

doi:10.1016/j.carbon.2011.11.013

Cited by 38 publications

(28 citation statements)

References 42 publications

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“…Porous materials like activated or templated carbons [1][2][3][4], metal-organic frameworks (MOFs) [5,6], covalent organic frameworks (COFs) [7], etc. are interesting candidates for gas storage application [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Adsorbent density impact on gas storage capacities

Kunowsky¹,

Suárez-Garcı́a²,

Linares‐Solano³

2013

Microporous and Mesoporous Materials

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In the literature, different approaches, terminologies, concepts and equations are used for calculating gas storage capacities. Very often, these approaches are not well defined, used and/or determined, giving rise to significant misconceptions. Even more, some of these approaches, very much associated with the type of adsorbent material used (e.g., porous carbons or new materials such as COFs and MOFs), impede a suitable comparison of their performances for gas storage applications. We review and present the set of equations used to assess the total storage capacity for which, contrarily to the absolute adsorption assessment, all its experimental variables can be determined experimentally without assumptions, ensuring the comparison of different porous storage materials for practical application. These materialbased total storage capacities are calculated by taking into account the excess adsorption, the bulk density (ρ bulk ) and the true density (ρ true ) of the adsorbent. The impact of the material densities on the results are investigated for an exemplary hydrogen isotherm obtained at room temperature and up * Tel.: +34 965 90 93 50; Fax: +34 965 90 34 54.Email address: kunowsky@ua.es (Mirko Kunowsky) February 5, 2013 to 20 MPa. It turns out that the total storage capacity on a volumetric basis, which increases with both, ρ bulk and ρ true , is the most appropriate tool for comparing the performance of storage materials. However, the use of the total storage capacities on a gravimetric basis cannot be recommended, because low material bulk densities could lead to unrealistically high gravimetric values. Preprint submitted to Microporous and Mesoporous Materials

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Section: Introductionmentioning

confidence: 99%

Adsorbent density impact on gas storage capacities

Kunowsky¹,

Suárez-Garcı́a²,

Linares‐Solano³

2013

Microporous and Mesoporous Materials

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“…There are not many papers analyzing, and revealing, the importance that both parameters (porosity and density) have on the results related to gas storage applications [6,14,16,21,[25][26][27][28][29]. Additionally, most of these papers use to deal with small amounts of samples (laboratory scale, usually with << 1 g obtained).…”

Section: Introductionmentioning

confidence: 99%

Gas storage scale-up at room temperature on high density carbon materials

Marco-Lozar

Kunowsky

Carruthers³

et al. 2014

Carbon

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In relation to the current interest on gas storage demand for environmental applications (e.g., gas transportation, and carbon dioxide capture) and for energy purposes (e.g., methane and hydrogen), high pressure adsorption (physisorption) on highly porous sorbents has become an attractive option. Considering that for high pressure adsorption, the sorbent requires both, high porosity and high density, the present paper investigates gas storage enhancement on selected carbon adsorbents, both on a gravimetric and on a volumetric basis. Results on carbon dioxide, methane, and hydrogen adsorption at room temperature (i.e., supercritical and subcritical gases) are reported. From the obtained results, the importance of both parameters (porosity and density) of the adsorbents is confirmed. Hence, the densest of the different carbon materials used is selected to study a scale-up gas storage system, with a 2.5 l cylinder tank containing 2.64 kg of adsorbent. The scale-up results are in agreement with the laboratory scale ones and highlight the importance of the adsorbent density for volumetric storage performances,

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“…In the case of the ACNF and the Donacarbo-based samples it can be observed that their compressed densities are very close to their tap densities. This reveals that these materials have a strong resiliency behavior [29].…”

Section: Resultsmentioning

confidence: 81%

“…An amorphous carbon nanofibre which was prepared by Prof. A. Oya by using his polymer blend technique and spinning [27,28], was activated with 100 ml min -1 of CO 2 at 1073 K during 24 h (sample ACNF) [29].…”

Section: Activated Carbon Nanofibres (Acnf)mentioning

confidence: 99%

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Activated Carbon Fibre Monoliths for Hydrogen Storage

Kunowsky

Marco-Lozar

Linares‐Solano³

2014

Advances in Science and Technology

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Abstract. Porous adsorbents are currently investigated for hydrogen storage application. From a practical point of view, in addition to high porosity developments, high material densities are required, in order to confine as much material as possible in a tank device. In this study, we use different measured sample densities (tap, packing, compacted and monolith) for analyzing the hydrogen adsorption behavior of activated carbon fibres (ACFs) and activated carbon nanofibres (ACNFs) which were prepared by KOH and CO 2 activations, respectively. Hydrogen adsorption isotherms are measured for all of the adsorbents at room temperature and under high pressures (up to 20 MPa). The obtained results confirm that (i) gravimetric H 2 adsorption is directly related to the porosity of the adsorbent, (ii) volumetric H 2 adsorption depends on the adsorbent porosity and importantly also on the material density, (iii) the density of the adsorbent can be improved by packing the original adsorbents under mechanical pressure or synthesizing monoliths from them, (iv) both ways (packing under pressure or preparing monoliths) considerably improve the storage capacity of the starting adsorbents, and (v) the preparation of monoliths, in addition to avoid engineering constrains of packing under mechanical pressure, has the advantage of providing high mechanical resistance and easy handling of the adsorbent.

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Hydrogen storage in CO2-activated amorphous nanofibers and their monoliths

Cited by 38 publications

References 42 publications

Adsorbent density impact on gas storage capacities

Adsorbent density impact on gas storage capacities

Gas storage scale-up at room temperature on high density carbon materials

Activated Carbon Fibre Monoliths for Hydrogen Storage

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