01421nab a2200205 4500 20260520000836.0 260224s2009 xxu Characteristics of natural gas hydrates occurring in pore-spaces of marine sediments collected from the eastern Nankai trough, off Japan nov./dic. 2009 08/06/2010 ; 08/06/2010 6 p. ; 5580-5586 Transcripción del resumen del autor. Pore-space gas hydrates sampled from the eastern Nankai Trough area off of Japan were minutely characterized using several instrumental techniques. Gas chromatographic results indicated that the natural gas in the sediment samples studied comprises mainly CH4. The concentrations of minor components varied according to depth. The powder X-ray diffraction patterns showed that the pore-space hydrates were of structure I (sI); the lattice constants were 1.183-1.207 nm. Both 13C NMR and Raman spectra confirmed that CH4 molecules were encaged in sI hydrate lattice. The average cage occupancies were calculated, respectively, from the Raman data as 0.83 for small cages and 0.97 for large cages. The hydration numbers were determined as 6.1-6.2. 6 Energy & fuels 23 ARTICULO Kida, Masato 42290 Suzuki, Kiyofumi 42291 Kawamura, Taro 42292 170794 170794 0 0 0 0 238613 BAAB BAAB 2026-03-05 200045648 0 200045648 2026-03-05 15:12:59 2026-03-05 ARTICULO