High volumetric and energy densities of methane stored in nanoporous materials at ambient temperatures and moderate pressures
High volumetric and energy densities of methane stored in nanoporous materials at ambient temperatures and moderate pressures
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DOI：
10.1016/j.cej.2015.02.088
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发表时间：
2015-07-15
影响因子：
15.1
通讯作者：
Mays, Timothy J.
中科院分区：
文献类型：
--
作者：
Bimbo, Nuno;Physick, Andrew J.;Mays, Timothy J.
给出了甲烷在两种高比表面积碳(TE7-20和AX-21)和一种金属有机骨架(MIL-101(Cr))上的吸附实验结果，得到了在250~350K和15 Mpa压力下的吸附等温线。对等温线进行了分析，以确定这些材料是否可以作为车载固态甲烷存储的可行替代品。结果表明，在所有材料的孔内都有很高的吸附密度，有些甚至超过了液体甲烷的密度。在中压低于5 Mpa时，计算的总能量密度接近甲醇的能量密度，几乎是汽油能量密度的40%。结果表明，与相同条件下的标准压缩相比，吸附可能是一种具有竞争力的存储替代方案，因为它可以在低得多的压力下提供相同的体积容量，从而减少了与压缩相关的能量损失。结果表明，这些材料吸附储存甲烷的最佳条件是在中等压力范围内，在中等压力范围内，与相同操作条件下的压缩甲烷气瓶相比，使用吸附剂时储存量的增加更为显著。最后，对吸附甲烷的输送能力进行了研究，模拟了3.5和6.5 Mpa两种充气压力和0.5 Mpa的放电压力两种情况。结果表明，一些材料具有较高的工作容量，其中一些材料在6.5 Mpa充放电和0.5 Mpa输送时的体积工作容量超过140 kg m(-3)。(C)2015爱思唯尔B.V.保留所有权利。
Experimental results for methane adsorption on two high-surface area carbons (TE7-20 and AX-21) and one metal-organic framework (MIL-101(Cr)) are presented, with isotherms obtained at temperatures ranging from 250 to 350 K and at pressures up to 15 MPa. The isotherms were analysed to determine if these materials could be viable alternatives for on-board solid-state storage of methane. The results show a very high adsorbate density in the pores of all materials, which for some can even exceed liquid methane density. At moderate pressures below 5 MPa, the calculated total energy densities are close to the energy density of methanol, and are almost 40% of the energy density of gasoline (petrol). Compared with standard compression at the same conditions, the results show that adsorption can be a competitive storage alternative, as it can offer equal volumetric capacities at much lower pressures, hence reducing the energy penalty associated with compression. It is shown that the optimal conditions for adsorptive methane storage in these materials are at moderate pressure ranges, where the gains in amounts stored when using an adsorbent are more pronounced when compared to cylinders of compressed methane gas at the same operating conditions. Finally, a study on deliverable capacities for adsorbed methane was carried out, simulating two charging pressure scenarios of 3.5 and 6.5 MPa and discharge at 0.5 MPa. The results show that some of the tested materials have high working volumetric capacities, with some materials displaying more than 140 kg m(-3) volumetric working capacity for charging at 6.5 MPa and delivery at 0.5 MPa. (C) 2015 Elsevier B.V. All rights reserved.