Table 2. Arrhenius Parameters for the Hydrothermal Reduction of HCO₃^–

rate constant	pathway	k250°C (min–1)	k300°C (min–1)	k350°C (min–1)	ln A	Ei (kJ/mol)
k1	liquids → formic acid	0.00817	0.0143	0.0230	1.63	28
k2	formic acid → solids	0.00290	0.00657	0.0131	3.58	41
k3	liquids → gas	0.00022	0.000859	0.00269	7.21	68
k4	formic acid → acetic acid	7.04 × 10–6	2.98 × 10–5	0.0001	4.69	72
k5	formic acid → gas	3.08 × 10–7	1.84 × 10–6	8.22 × 10–6	5.47	89
k6	acetic acid → gas	1.12 × 10–9	9.76 × 10–9	6.02 × 10–8	4.22	108