关键词: 水合物/
高压/
中子衍射/
CO2注入
English Abstract
Structure and properties of nature clathrate and its application in energy and enviromental science
Zhu Jin-Long1,Zhao Yu-Sheng2,
Jin Chang-Qing3
1. Center for High Pressure Science and Technology Advanced Research, Beijing 100094, China;
2. Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China;
3. Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
Received Date:03 September 2018
Accepted Date:20 November 2018
Published Online:05 January 2019
Abstract:Clathrate hydrates are energy and environmental related materials for energy storage and extraction, as well as for waste gas sequestration. The three general structures of natural clathrates, structure I, structure Ⅱ and structure H are reviewed in the aspects of stability, cage size, and preferred guest molecule encapsulation. Neutron scattering technique has its unique advantage of clathrate hydrates characterization, such as large bulk property determination, penetration of high pressure vessel and the clathrate sample inside, sensitive to light elements (clathrate hydrates mainly containing C, H, and O atoms). Neutron diffraction and inelastic neutron scattering of clathrate hydrates are covered on the abilities of H/D atoms positions and anisotropic thermal parameters, pressure-temperature-dependent guest molecule occupancy, the disordered distributions of guest molecules and the nuclear density distributions, the thermodynamic and kinetic process of formation and decomposition, the translational and rotational vibration models of guest molecules and their quantum state transitions. Using CO2 to gently replace CH4 in methane hydrate is one of the most attractive exploiting schemes for its benefits to both geologic hazard consideration and cost efficiency (energy extraction and CO2 sequestration).
Keywords: clathrate hydrates/
high pressure/
neutron scattering/
CO2 injection
