Title: Simulating the Geological Fate of Terrestrial Organic Matter: Lignin vs Cellulose

Journal Article · · Energy and Fuels
 [1];  [2]; ORCiD logo [2];  [3];  [2]; ORCiD logo [4];  [2]; ORCiD logo [5]
  1. Aix-Marseille Univ., Marseille (France); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); University of Utah
  2. Aix-Marseille Univ., Marseille (France); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. Aix-Marseille Univ., Marseille (France)
  4. Pennsylvania State Univ., University Park, PA (United States)
  5. Aix-Marseille Univ., Marseille (France); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Univ. Bordeaux (France)

While shale gas has become a major source of energy, a more sustainable recovery requires a better understanding of the gas/kerogen matrix interactions. Here, we use replica exchange molecular dynamics to investigate the geological conversion of two important classes of gas-forming constituents of the terrestrial organic matter: lignin and cellulose. In agreement with results from pyrolysis experiments, we show that lignin produces twice as much kerogen and 5 times more methane than cellulose. In addition, while ex-cellulose kerogen is relatively stiff and almost nonporous, ex-lignin kerogen, despite having a very similar composition and bonding, is an order of magnitude more compliant due to the presence of large micropores. The obtained results can potentially improve the nanoscale brick of bottom-up models of shale gas recovery.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Multi-Scale Fluid-Solid Interactions in Architected and Natural Materials (MUSE); Univ. of Utah, Salt Lake City, UT (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0019285
OSTI ID:
1617884
Journal Information:
Energy and Fuels, Journal Name: Energy and Fuels Journal Issue: 2 Vol. 34; ISSN 0887-0624
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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