Exceptionally High Gravimetric Methane Storage in Aerogel-Derived Carbons
Storage of natural gas in highly porous materials provides a safer and more energy-efficient solution to energy-intensive compression and liquefaction options for advancing natural gas vehicular systems. Herein, we investigate the potential of highly porous aerogel-derived mesoporous carbons for storage of methane under the conditions relevant to adsorbed natural gas (ANG) tanks. Analysis of high-pressure isotherms indicated that EC-RF with a 2355 m2/g surface area and a 6.77 cm3/g total pore volume exhibited an exceptionally high gravimetric methane uptake with a deliverable capacity of 261 cm(STP)3/g in the pressure range of 5.8-65 bar and 25 °C which was 48% higher than that of the benchmark HKUST-1 material. Such behavior is attributed to its ultrahigh pore volume, large surface area, and low bulk density. In addition, our investigations demonstrated that upon desorbing the stored methane at 50 °C instead of 25 °C, both the methane deliverable capacity and the amount of methane recovered over EC-RF can be further increased to 305 cm(STP)3/g and 17%, respectively. Moreover, cyclic charge-discharge profiles revealed stable storage performance for this material. However, despite high gravimetric uptake, the volumetric uptake was only 89 cm(STP)3/cm3, which was 50% that of HKUST-1. The results reported herein demonstrate that for aerogel-based carbons to be considered suitable as ANG adsorbents, their properties should be optimized to yield high volumetric storage capacity, balanced with their exceptionally high gravimetric uptake capacity.
Q. Al-Naddaf et al., "Exceptionally High Gravimetric Methane Storage in Aerogel-Derived Carbons," Industrial and Engineering Chemistry Research, vol. 59, no. 43, pp. 19383-19391, American Chemical Society (ACS), Oct 2020.
The definitive version is available at https://doi.org/10.1021/acs.iecr.0c03225
Chemical and Biochemical Engineering
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© 2020 American Chemical Society (ACS), All rights reserved.
28 Oct 2020