波谱学杂志2017，Vol.34Issue(2)：148-155,8.DOI:10.11938/cjmr20170203
甲烷水合物的固体核磁共振碳谱与激光拉曼光谱研究
A Solid-State 13C NMR and Laser Raman Spectroscopy Study on Synthesized Methane Hydrates
摘要
Abstract
Methane hydrates (CH4·nH2O) mainly composed of methane and water are ice-like crystalline clathrate compounds. They form a large natural gas reservoir due to their abundance. Solid-state NMR and laser Raman spectroscopy are two techniques which can be used for microscopic analysis for methane hydrates. In this paper, a low temperature solid-state13C NMR technology was used to study the structures of synthesized methane hydrates. It was shown that1H high power decoupling (1H HPDEC) had a better performance than13C cross polarization (13C CP) for quantitative analysis for methane hydrates. The NMR results indicated that the methane hydrates synthesized by mixing methane gas with ice powder had a type-I structure, with large and small cage occupancies of 0.988 and 0.824, respectively, and a hydrate number of 6.07. Methane hydrates synthesized by mixing the methane gas with the continental slope of the South China Sea site SH2 sediments and ice powder also had a type-I structure, with large and small cage occupancies of 0.987 and 0.887, respectively, and a hydrate number of 5.98. The result showed that addition of site SH2 sediments could reduce hydrate number of methane hydrates, and make small cage occupancy and hydrate saturation higher, which were verified by laser Raman spectroscopy.关键词
固体13CNMR/激光拉曼光谱/甲烷水合物Key words
solid-state 13C NMR/laser Raman spectroscopy/methane hydrates分类
数理科学引用本文复制引用
付娟,吴能友,邬黛黛,苏秋成..甲烷水合物的固体核磁共振碳谱与激光拉曼光谱研究[J].波谱学杂志,2017,34(2):148-155,8.基金项目
国家自然科学基金资助项目(41273022) （41273022）
中国石油-中科院科技合作项目(2015A-4813) （2015A-4813）
中国科学院广州能源研究所所长创新基金培育专项(y307p51001). （y307p51001）
