Structure and thermal expansion of natural gas clathrate hydrates
Structure and thermal expansion of natural gas clathrate hydrates
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DOI：
10.1016/j.ces.2005.11.049
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发表时间：
2006-04
影响因子：
4.7
通讯作者：
S. Takeya;Masato Kida;H. Minami;H. Sakagami;A. Hachikubo;N. Takahashi;H. Shoji;V. Soloviev;K. Wallmann;N. Biebow;A. Obzhirov;A. Salomatin;J. Poort
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文献类型：
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作者：
S. Takeya;Masato Kida;H. Minami;H. Sakagami;A. Hachikubo;N. Takahashi;H. Shoji;V. Soloviev;K. Wallmann;N. Biebow;A. Obzhirov;A. Salomatin;J. Poort
本文报道了鄂霍次克海天然气水合物晶体的结构性质。通过粉末x射线衍射（PXRD），确定了四个地点的沉积物中含有I型天然气水合物，其中大部分是甲烷（96% - 98%）和少量二氧化碳。在113K时，所有水合物的晶格常数估计为11.85A˚，与纯甲烷水合物的晶格常数大致相等。这与人工合成甲烷+二氧化碳混合气体水合物的结构吻合较好。这些结果表明，天然气水合物的晶格常数不随co2含量的变化而变化。此外，测量了样品水合物在83-173K温度范围内的热膨胀，得到273K温度下水合物晶体密度为0.92g/cm3。这些结果对于将天然气水合物作为一种可替代的天然燃料资源加以应用具有重要意义。
We report on the structural properties of natural gas hydrate crystals from the Sea of Okhotsk. Using powder X-ray diffraction (PXRD), it was determined that sediments from four locations contained type I gas hydrate, which encage mostly methane (96–98%) and a small amount of carbon dioxide. For all hydrates, the lattice constant was estimated to be 11.85A˚ at 113K, which approximately equals that of pure methane hydrate. The result is in good agreement with the structure of artificially synthesized methane + carbon dioxide mixed-gas hydrates. These results suggest that the lattice constant of the natural gas hydrate does not change due to a change of CO2gas content. In addition, the thermal expansion of the sampled hydrate was measured for the temperature range of 83–173K, and the resulting density of the hydrate crystal at 273K was estimated to be 0.92g/cm3. These results are essential for applying natural gas hydrates as an alternative natural fuel resources.