Methane hydrate formation in confined nanospace can surpass nature
Methane hydrate formation in confined nanospace can surpass nature
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DOI：
10.1038/ncomms7432
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发表时间：
2015-03-01
影响因子：
16.6
通讯作者：
Rodriguez-Reinoso, Francisco
中科院分区：
文献类型：
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作者：
Casco, Mirian E.;Silvestre-Albero, Joaquin;Rodriguez-Reinoso, Francisco
天然甲烷水合物被认为是地球上最大的碳氢化合物来源。这些结构是在特定的位置形成的，如深海沉积物和永久冻土，这是基于高压和低温的苛刻条件。在这里，我们报告说，通过利用纳米孔空间的限制效应，合成甲烷水合物在温和的条件下（3.5 MPa和2摄氏度）生长，动力学（几分钟内）比自然更快，完全可逆，并且具有模仿自然的名义化学计量。利用非弹性中子散射实验和同步x射线粉末衍射证实了纳米空间中水合物结构的形成及其与天然水合物的相似性。这些发现可能是将甲烷水合物的智能合成应用于能源需求应用（例如，运输）的一步。
Natural methane hydrates are believed to be the largest source of hydrocarbons on Earth. These structures are formed in specific locations such as deep-sea sediments and the permafrost based on demanding conditions of high pressure and low temperature. Here we report that, by taking advantage of the confinement effects on nanopore space, synthetic methane hydrates grow under mild conditions (3.5 MPa and 2 degrees C), with faster kinetics (within minutes) than nature, fully reversibly and with a nominal stoichiometry that mimics nature. The formation of the hydrate structures in nanospace and their similarity to natural hydrates is confirmed using inelastic neutron scattering experiments and synchrotron X-ray powder diffraction. These findings may be a step towards the application of a smart synthesis of methane hydrates in energy-demanding applications (for example, transportation).