沸石模板碳材料用于高压储氢。

Zeolite-templated carbon materials for high-pressure hydrogen storage.

机构信息

WM Keck Laboratory, California Institute of Technology, Pasadena, California 91125, United States.

出版信息

Langmuir. 2012 Jul 3;28(26):10057-63. doi: 10.1021/la302050m. Epub 2012 Jun 19.

DOI:10.1021/la302050m

Abstract

Zeolite-templated carbon (ZTC) materials were synthesized, characterized, and evaluated as potential hydrogen storage materials between 77 and 298 K up to 30 MPa. Successful synthesis of high template fidelity ZTCs was confirmed by X-ray diffraction and nitrogen adsorption at 77 K; BET surface areas up to ~3600 m(2) g(-1) were achieved. Equilibrium hydrogen adsorption capacity in ZTCs is higher than all other materials studied, including superactivated carbon MSC-30. The ZTCs showed a maximum in Gibbs surface excess uptake of 28.6 mmol g(-1) (5.5 wt %) at 77 K, with hydrogen uptake capacity at 300 K linearly proportional to BET surface area: 2.3 mmol g(-1) (0.46 wt %) uptake per 1000 m(2) g(-1) at 30 MPa. This is the same trend as for other carbonaceous materials, implying that the nature of high-pressure adsorption in ZTCs is not unique despite their narrow microporosity and significantly lower skeletal densities. Isoexcess enthalpies of adsorption are calculated between 77 and 298 K and found to be 6.5-6.6 kJ mol(-1) in the Henry's law limit.

摘要

沸石模板碳（ZTC）材料被合成、表征，并在 77 至 298 K 之间、30 MPa 以下评估为有潜力的储氢材料。通过 X 射线衍射和 77 K 下的氮气吸附证实了高模板保真度 ZTC 的成功合成；实现了高达约 3600 m²/g 的 BET 比表面积。ZTC 中的平衡氢吸附容量高于所有其他研究的材料，包括超活性炭 MSC-30。ZTC 在 77 K 时具有 28.6 mmol g(-1)（5.5 wt %）的最大吉布斯表面过剩吸附量，在 300 K 时的氢吸附容量与 BET 比表面积呈线性正比：在 30 MPa 下，每 1000 m²/g 就有 2.3 mmol g(-1)（0.46 wt %）的吸附量。这与其他碳质材料的趋势相同，尽管 ZTC 的微孔狭窄且骨架密度明显较低，但它们在高压下吸附的性质并不是唯一的。在 77 至 298 K 之间计算了等过剩吸附焓，在亨利定律极限下发现为 6.5-6.6 kJ mol(-1)。