Thermodynamic Stability, Spectroscopic Identification, and Gas Storage Capacity of CO2–CH4–N2 Mixture Gas Hydrates: Implications for Landfill Gas Hydrates
| Autor: | Donghyun Moon, Byeong-Soo Kim, Kyu Won Han, Sook-Hyun Ahn, Hyeong-Hoon Lee, Gang-Woo Lee, Ji-Ho Yoon, Byong-Uk Nam, Hyungjoon Shin |
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| Rok vydání: | 2012 |
| Předmět: |
Magnetic Resonance Spectroscopy
Chromatography Trace Amounts Nitrogen Chemistry Clathrate hydrate Analytical chemistry Water General Chemistry Carbon Dioxide Spectrum Analysis Raman Mole fraction Carbon Dissociation (chemistry) Refuse Disposal Kinetics Anaerobic digestion Landfill gas X-Ray Diffraction Pressure Thermodynamics Environmental Chemistry Chemical stability Hydrate Methane |
| Zdroj: | Environmental Science & Technology. 46:4184-4190 |
| ISSN: | 1520-5851 0013-936X |
| Popis: | Landfill gas (LFG), which is primarily composed of CH(4), CO(2), and N(2), is produced from the anaerobic digestion of organic materials. To investigate the feasibility of the storage and transportation of LFG via the formation of hydrate, we observed the phase equilibrium behavior of CO(2)-CH(4)-N(2) mixture hydrates. When the specific molar ratio of CO(2)/CH(4) was 40/55, the equilibrium dissociation pressures were gradually shifted to higher pressures and lower temperatures as the mole fraction of N(2) increased. X-ray diffraction revealed that the CO(2)-CH(4)-N(2) mixture hydrate prepared from the CO(2)/CH(4)/N(2) (40/55/5) gas mixture formed a structure I clathrate hydrate. A combination of Raman and solid-state (13)C NMR measurements provided detailed information regarding the cage occupancy of gas molecules trapped in the hydrate frameworks. The gas storage capacity of LFG hydrates was estimated from the experimental results for the hydrate formations under two-phase equilibrium conditions. We also confirmed that trace amounts of nonmethane organic compounds do not affect the cage occupancy of gas molecules or the thermodynamic stability of LFG hydrates. |
| Databáze: | OpenAIRE |
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