0 引言
1 实验部分
1.1 实验材料
1.2 实验装置
Fig. 1 Diagram of high-pressure hydrate formation apparatus图1 高压水合物样品合成装置 |
1.3 聚N-乙烯基己内酰胺的合成
Fig. 2 Synthesis of poly(N-vinylcaprolactam)图2 聚N-乙烯基己内酰胺合成方法 |
1.4 水合物分解微观实验步骤
2 实验结果与讨论
2.1 原位PXRD测量
Fig. 3 Typical PXRD patterns of CH4 hydrate at atmosphere pressure and -10℃ (2θ = 20° - 36°)图3 常压和 -10℃条件下CH4水合物PXRD谱图(2θ = 20° ~ 36°) |
Fig. 4 In-situ PXRD patterns of CH4 hydrate dissociation with pure water (a) and 1.0% PVCap (b)图4 纯水(a)和1.0% PVCap(b)体系中CH4水合物分解过程的原位PXRD谱图 |
Fig. 5 Normalized integrated intensities of the diffraction peaks for CH4 hydrate (sI) and Ih: (a) pure water; (b) 1.0% PVCap aqueous solution system图5 CH4水合物(sI)和Ih的无量纲晶面特征峰面积: (a)纯水体系;(b)1.0% PVCap水溶液体系 |
2.2 拉曼测量
Fig. 6 Typical Raman spectra for CH4 hydrate in pure water and PVCap at atmosphere pressure and -10oC图6 常压和 -10℃条件下甲烷水合物拉曼光谱图 |
Fig. 7 In-situ Raman spectra of CH4 hydrate in the presence of pure water (a) and 1.0% PVCap (b) during the dissociation process图7 纯水(a)和1.0% PVCap(b)体系中甲烷水合物分解过程的原位拉曼光谱图 |
Fig. 8 Integral intensity ratios for CH4 in large and small cages (AL/AS) during the hydrate dissociation process图8 水合物分解过程CH4在大笼和小笼中的峰强积分之比(AL/AS) |
Fig. 9 Time-dependent normalized intensities of C—H stretching for CH4 in large and small cages during the hydrate dissociation process图9 水合物分解过程CH4在大笼和小笼中的C—H伸缩振动峰无量纲峰强积分随时间变化 |