Deep Conversion of Carbon Monoxide to Hydrogen and Formation of Acetate by the Anaerobic Thermophile Carboxydothermus hydrogenoformans

Table 1

Observed partial pressures and the calculated Gibbs free energy change of CO conversion by C. hydrogenoformans in batch culture.

Culture	𝑡 (h)	H2 (Pa)	CO (Pa)	CO2 (Pa)	Acetate (mM)	Δ𝐺R1^(a)	Δ𝐺R2^(a)
−CO2 trap	0.5	6.0⋅10^2	2.4⋅10^5	1.1⋅10^3	0.2 ^(b)	−53	−52
	9.5	2.0⋅10^5	1.8⋅10^4	1.3⋅10^5		−16
	55	2.0⋅10^5	3.9⋅10^1	1.3⋅10^5	3.8	+1	−18
+CO2 trap	0.5	2.2⋅10^2	2.6⋅10^5	8.4⋅10^2	0.2	−57	−52
	12.5	2.0⋅10^5	1.4⋅10^4	1.2⋅10^4		−22
	55	2.1⋅10^5	0.4⋅10^0	3.5⋅10^2	0.2	−3	−16

^(a)Δ𝐺_R1 and Δ𝐺_R2: Gibbs free energy change (kJ/mol CO) for reaction (1) and reaction (2), respectively, at 70°C [10].
^(b)Underlined: detection limits that were used in calculation of free energy.