Constraints of biomethane generation yield and carbon isotope fractionation effect in the pathway of acetotrophic with different coal-rank coals

Fuel ◽  
2021 ◽  
Vol 305 ◽  
pp. 121493
Author(s):  
Yuan Bao ◽  
Dan Li ◽  
Yiwen Ju
Molecules ◽  
2021 ◽  
Vol 26 (14) ◽  
pp. 4215
Author(s):  
Hiromi Kimura ◽  
Go Fuseya ◽  
Satoshi Takeya ◽  
Akihiro Hachikubo

Knowledge of carbon isotope fractionation is needed in order to discuss the formation and dissociation of naturally occurring CO2 hydrates. We investigated carbon isotope fractionation during CO2 hydrate formation and measured the three-phase equilibria of 12CO2–H2O and 13CO2–H2O systems. From a crystal structure viewpoint, the difference in the Raman spectra of hydrate-bound 12CO2 and 13CO2 was revealed, although their unit cell size was similar. The δ13C of hydrate-bound CO2 was lower than that of the residual CO2 (1.0–1.5‰) in a formation temperature ranging between 226 K and 278 K. The results show that the small difference between equilibrium pressures of ~0.01 MPa in 12CO2 and 13CO2 hydrates causes carbon isotope fractionation of ~1‰. However, the difference between equilibrium pressures in the 12CO2–H2O and 13CO2–H2O systems was smaller than the standard uncertainties of measurement; more accurate pressure measurement is required for quantitative discussion.


Geology ◽  
2004 ◽  
Vol 32 (6) ◽  
pp. 533 ◽  
Author(s):  
Joanna Potter ◽  
Michael G. Siemann ◽  
Mikhail Tsypukov

Author(s):  
Samuel R. Phelps ◽  
Gwenn M. M. Hennon ◽  
Sonya T. Dyhrman ◽  
María D. Hernández‐Limón ◽  
Olivia M. Williamson ◽  
...  

2007 ◽  
Vol 41 (22) ◽  
pp. 7744-7751 ◽  
Author(s):  
Eva-Maria Ewald ◽  
Anke Wagner ◽  
Ivonne Nijenhuis ◽  
Hans-Hermann Richnow ◽  
Ute Lechner

1978 ◽  
Vol 61 (4) ◽  
pp. 680-687 ◽  
Author(s):  
Marilyn F. Estep ◽  
F. Robert Tabita ◽  
Patrick L. Parker ◽  
Chase Van Baalen

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