Volumetric hydrogen sorption capacity of monoliths prepared by mechanical densification of MOF-177

Zacharia, Renju; Cossement, Daniel; Lafi, Lyubov; Chahine, Richard

doi:10.1039/b922991d

Cited by 128 publications

(122 citation statements)

References 15 publications

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“…Excess hydrogen adsorption at 298 K on various microporous adsorbents compared with some data from the literature where available(Casa-Lillo et al 2002;Nishihara et al 2009;Zacharia et al 2010;Panella et al 2006;Liu et al 2009) well with reported values, and extend the measurement up to 45 MPa. The present high pressure measurements reach a maximum of 0.94 wt.% at 45…”

supporting

confidence: 55%

“…For MOF-177, reported adsorption values at ambient temperature are limited to below 12 MPa in the open literature (Li and Yang 2007;Proch et al 2008;Zacharia et al 2010). The present measurements under 12 MPa compare MPa.…”

Section: Hydrogen Excess Adsorption At 298 Kmentioning

confidence: 96%

“…4 could feasibly be increased by a factor of approximately 2-3 by increasing the packing density. However, increased compaction beyond a certain level has been shown to damage the structure and reduce the material's capacity (Zacharia et al 2010;Bénard and Chahine 2001;Purewal et al 2012). Additionally, since the bed density does not change the sign of (1), compaction cannot change a negative storage gain to a positive one, so compaction of most of the materials actually results in more negative gains at high pressures.…”

Section: Volumetric Storage Gainmentioning

confidence: 97%

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Hydrogen adsorption on microporous materials at ambient temperatures and pressures up to 50 MPa

2012

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High surface area microporous adsorbents are often proposed as potential hydrogen storage materials, although typically at 77 K and less than 5 MPa. In this study, we focus on conditions more suitable for automotive applications by investigating the storage capacities of microporous materials at 298 K and at pressures up to 50 MPa. In an effort to derive trends within and across material classes, we examined a wide range of materials with varying microstructures including the activated carbons AX-21, KUA-5, and MSC-30; a zeolite templated carbon; a hypercrosslinked polymer; and the Metal Organic Frameworks MOF-177, IRMOF-20, MIL-53, ZIF-8, and Cu 3 (btc) 2 . The peak excess adsorption of these materials ranged from 0.8-1.8 wt.%, although many did not reach their maximum capacity even at high pressures. However, the total volumetric storage gains over compressed hydrogen gas were quite low and, in many cases, negative. In addressing ambient temperature adsorption at significantly higher pressures than previously reported, our data confirms and extends the range of validity of several existing DFT calculations. Furthermore, our data suggest that, for both activated carbons and MOFs, factors other than specific surface area govern ambient temperature adsorption capacity. Contrary to some reports, the high fractions of sub-nanometer pores in some of the investigated MOFs did not appear to enhance the excess adsorption even at high pressures. For on-board applications with ambient temperature storage, significant enhancements to the attractive force at the materials' surface are required, beyond merely increasing specific surface area, or for MOFs, tuning of pore sizes.

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supporting

confidence: 55%

Section: Hydrogen Excess Adsorption At 298 Kmentioning

confidence: 96%

Section: Volumetric Storage Gainmentioning

confidence: 97%

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Hydrogen adsorption on microporous materials at ambient temperatures and pressures up to 50 MPa

2012

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“…Thereby, it has to be taken into account to which point mechanical pressure could alter the porosity of the adsorbent. While activated carbon materials are relatively resistant in this sense, the porous structure of MOFs is very susceptible to external forces [22][23][24].…”

Section: Equationsmentioning

confidence: 99%

“…In addition, the volumetric excess densities of MOFs and COFs are often calculated by taking into account their crystal densities [29][30][31] instead of their bulk (tap or packing) densities, which, unfortunately, are scarcely reported [5,21,22,24,32,33]. This practice leads to overestimated volumetric excess adsorption results, because it does not account for the void spaces in-between the particles of the powdered samples, as it has been clearly shown and discussed elsewhere, especially considering that the bulk densities of MOFs and…”

Section: Equationsmentioning

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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Research Status of Metal–Organic Frameworks for On‐Board Cryo‐Adsorptive Hydrogen Storage Applications

Dailly¹

2011

Metal‐Organic Frameworks

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Volumetric hydrogen sorption capacity of monoliths prepared by mechanical densification of MOF-177

Cited by 128 publications

References 15 publications

Hydrogen adsorption on microporous materials at ambient temperatures and pressures up to 50 MPa

Hydrogen adsorption on microporous materials at ambient temperatures and pressures up to 50 MPa

Adsorbent density impact on gas storage capacities

Research Status of Metal–Organic Frameworks for On‐Board Cryo‐Adsorptive Hydrogen Storage Applications

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