Fig. 3. Catalytic performance.

a CO conversion and product selectivity for ε-Fe₂C with various manganese addition levels. (Reaction conditions: 0.10 g of catalyst, 573 K, 2.0 MPa, H₂/CO = 2.5, and gas hourly space velocity (GHSV) varied from 20 to 500 L·g_cat⁻¹·h⁻¹ for a CO conversion rate of 41.5 ± 1.5%.) b Comparison of the catalytic performance of ε-Fe₂C-xMn with that of other previously reported catalysts^{5,10,14,22,45–47}. c Stability test for the ε-Fe₂C-0.4Mn catalyst (reaction conditions: 0.10 g of catalyst, 573 K, 2.0 MPa, H₂/CO = 2.5, GHSV = 20 L·g_cat⁻¹·h⁻¹).