NMR研究甲烷水合物在中孔SBA-15内的生成

利用自行研制的高压釜和原位高压核磁共振研究了甲烷水合物在具有孔径均一的中孔SBA-15中的形成过程. 结果发现在静止的状态下，甲烷在中孔SBA-15内与水也能生成甲烷水合物，但其形成所需要的诱导时间比在纯水的条件下要短，SBA-15可促进甲烷水合物的形成；原位高压¹H和¹³C NMR研究表明即使甲烷过量，在一定压力下，SBA-15孔道内的水也不能完全形成甲烷水合物.

In Situ High-pressure NMR Observations of Formation of Methane Hydrate in the Mesochannels of SBA-15

A home-made high pressure apparatus and a static NMR cell capable of standing high pressure up to 10 MPa were employed to study the formation of methane hydrate in SBA-15 with uniform pore size and ordered hexagonal structure. It is found that, under static condition, the introductive period for methane hydrate formation in the mesochannels of SBA-15 is shorter than that for the formation of bulk methane hydrate, suggesting that SBA-15 can promote the formation of methane hydrate. In situ high-pressure ^1H and ^13C NMR studies show that at certain pressure, even in the presence of excess methane, not all the water molecules confined in the mesochannels of SBA-15 can be completely utilized to form methane hydrate.