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Table 2 Biochemical reactions, ATP yield and average stoichiometric number used in the thermodynamic potential factor calculation

From: Enrichment of syngas-converting mixed microbial consortia for ethanol production and thermodynamics-based design of enrichment strategies

Stoichiometry of biochemical reactions ATP yield (mol per reaction) χ Refs.
H2/CO2 conversion into acetate/ethanol
 4 H2 + 2 CO2 → CH3COO + H+ + 2 H2O 0.3 2 [40]
 6 H2 + 2 CO2 → CH3CH2OH + 3 H2O − 0.1/0.3a 3 [40]
CO conversion into acetate/ethanol
 4 CO + 2 H2O → CH3COO + H+ + 2 CO2 1.5 4 [40]
 6 CO + 3 H2O → CH3CH2OH + 4 CO2 1.7 6 [40]
VFA reduction to corresponding alcohols
 CH3COO + H+ + 2 H2 → CH3CH2OH + H2O 0.33 4 [42]
 CH3(CH2)2COO + H+ + 2 H2 → CH3(CH2)2CH2OH + H2O 0.33 4 [42]
 CH3COO + H+ + 2 CO + H2O → CH3CH2OH + 2 CO2 0.66 5  
 CH3(CH2)2COO + H+ + 2 CO + H2O → CH3(CH2)2CH2OH + 2 CO2 0.66 5  
Chain elongation
 5 CH3CH2OH + 3 CH3COO → 4 CH3(CH2)2COO + H+ + 3 H2O + 2 H2 1 1 [41]
  1. aBertsch and Müller [40] predicted an ATP yield of − 0.1; however, the possibility of a positive ATP yield was also evaluated