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.

中文翻译：

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气凝胶衍生碳中极高的甲烷甲烷存储量

将天然气存储在高度多孔的材料中，可为能源密集型压缩和液化方案提供更安全，更节能的解决方案，以推进天然气车载系统的发展。本文中，我们研究了在与吸附天然气（ANG）罐相关的条件下，高孔隙度气凝胶衍生的介孔碳在甲烷存储中的潜力。高压等温线分析表明，EC-RF的表面积为2355 m ² / g，总孔体积为6.77 cm ³ / g，表现出异常高的重量甲烷吸收能力，可输送容量为261 cm _（STP）³/ g在5.8–65 bar和25°C的压力范围内，比基准的HKUST-1材料高48％。这种行为归因于其超高的孔体积，大的表面积和低的堆积密度。此外，我们的研究表明，在50°C而不是25°C下解吸存储的甲烷后，甲烷的可输送容量和通过EC-RF回收的甲烷量都可以进一步提高到305 cm _（STP）³ / g和17％。此外，循环充放电曲线表明该材料具有稳定的存储性能。然而，尽管重量吸收很高，但体积吸收仅为89 cm _（STP）³ / cm ³，这是HKUST-1的50％。本文报道的结果表明，对于被认为适合作为ANG吸附剂的气凝胶基碳，应优化其性能以产生高体积存储容量，并兼具其异常高的重量吸收容量。