paleoclimate saw-tooth pattern & natural gas clathrate hydrates
DESCRIPTION
Paleoclimate Saw-tooth pattern & natural gas clathrate hydrates. Chung-Chieng Lai. Henry’s Law: concentration in water = K × pressure in air. Saw-tooth pattern; Temperature leads CH 4 that leads CO 2. 570. catalyst. CO 2 + 2 H 2 O + Heat. CH 4 + 2 O 2. Bacteria, etc. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Paleoclimate Saw-tooth pattern & natural gas clathrate hydrates](https://reader035.vdocuments.mx/reader035/viewer/2022062721/568138b3550346895da0728e/html5/thumbnails/1.jpg)
Paleoclimate Saw-tooth pattern & natural gas clathrate hydrates
Chung-Chieng Lai
![Page 2: Paleoclimate Saw-tooth pattern & natural gas clathrate hydrates](https://reader035.vdocuments.mx/reader035/viewer/2022062721/568138b3550346895da0728e/html5/thumbnails/2.jpg)
![Page 3: Paleoclimate Saw-tooth pattern & natural gas clathrate hydrates](https://reader035.vdocuments.mx/reader035/viewer/2022062721/568138b3550346895da0728e/html5/thumbnails/3.jpg)
Henry’s Law:concentration in water =
K × pressure in air
![Page 4: Paleoclimate Saw-tooth pattern & natural gas clathrate hydrates](https://reader035.vdocuments.mx/reader035/viewer/2022062721/568138b3550346895da0728e/html5/thumbnails/4.jpg)
Saw-tooth pattern; Temperature leads CH4 that leads CO2
570
![Page 5: Paleoclimate Saw-tooth pattern & natural gas clathrate hydrates](https://reader035.vdocuments.mx/reader035/viewer/2022062721/568138b3550346895da0728e/html5/thumbnails/5.jpg)
![Page 6: Paleoclimate Saw-tooth pattern & natural gas clathrate hydrates](https://reader035.vdocuments.mx/reader035/viewer/2022062721/568138b3550346895da0728e/html5/thumbnails/6.jpg)
CH4 + 2 O2 CO2 + 2 H2O + Heat
catalyst
Bacteria, etc.
Heat: 195,000 cal / mole of CH4
810,000 J
![Page 7: Paleoclimate Saw-tooth pattern & natural gas clathrate hydrates](https://reader035.vdocuments.mx/reader035/viewer/2022062721/568138b3550346895da0728e/html5/thumbnails/7.jpg)
400
750
400200
(a)
(b)
(c)
(d)
![Page 8: Paleoclimate Saw-tooth pattern & natural gas clathrate hydrates](https://reader035.vdocuments.mx/reader035/viewer/2022062721/568138b3550346895da0728e/html5/thumbnails/8.jpg)
![Page 9: Paleoclimate Saw-tooth pattern & natural gas clathrate hydrates](https://reader035.vdocuments.mx/reader035/viewer/2022062721/568138b3550346895da0728e/html5/thumbnails/9.jpg)
![Page 10: Paleoclimate Saw-tooth pattern & natural gas clathrate hydrates](https://reader035.vdocuments.mx/reader035/viewer/2022062721/568138b3550346895da0728e/html5/thumbnails/10.jpg)
![Page 11: Paleoclimate Saw-tooth pattern & natural gas clathrate hydrates](https://reader035.vdocuments.mx/reader035/viewer/2022062721/568138b3550346895da0728e/html5/thumbnails/11.jpg)
Methane hydrate
Structure I binary hydrate:
46H2O + 6(mG) + 2(sG)
sG – small-size gas, such as N2
mG – medium-size gas, such as CH4
![Page 12: Paleoclimate Saw-tooth pattern & natural gas clathrate hydrates](https://reader035.vdocuments.mx/reader035/viewer/2022062721/568138b3550346895da0728e/html5/thumbnails/12.jpg)
Clathrasil (mineral) at work
46 SiO2·6(lG)·2(sG)
sG: N2, Ar, Xe, CH4
lG: N2O, CO2, Kr, Xe,
CH3NH2 (methylamine)
![Page 13: Paleoclimate Saw-tooth pattern & natural gas clathrate hydrates](https://reader035.vdocuments.mx/reader035/viewer/2022062721/568138b3550346895da0728e/html5/thumbnails/13.jpg)
Dissociation:
Gas hydrate → gas + water
Gas hydrate solid to gas phase boundary:
T = T0 + a log (P/P0) (1)
T, T0, a : temperature
P, P0 : pressure
Phase boundary plots