Synthesis of Long-chain Paraffins over Bimetallic Na–Fe0.9Mg0.1Ox by Direct CO2 Hydrogenation

• Published in: Topics in catalysis Vol. 67; no. 5-8; pp. 363 - 376
• Main Authors: Ahmed, Sheraz, Bibi, Syeda Sidra, Irshad, Muhammad, Asif, Muhammad, Khan, Muhammad Kashif, Kim, Jaehoon
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.03.2024; Springer Nature B.V
• Subjects: Bimetals; Carbon dioxide; Catalysis; Catalysts; Characterization and Evaluation of Materials; Chemical reactions; Chemistry; Chemistry and Materials Science; Electron transfer; Fuels; Hydrocarbons; Hydrogenation; Industrial Chemistry/Chemical Engineering; Iron oxides; Magnesium oxide; Original Paper; Paraffins; Pharmacy; Physical Chemistry; Paraffins; Fe-based catalyst; CO; Bimetallic catalyst; hydrogenation; MgO promoter
• ISSN: 1022-5528; 1572-9028
• DOI: 10.1007/s11244-023-01888-3

Direct CO 2 hydrogenation into long-chain hydrocarbons over iron catalysts is considered the most promising approach to mitigate global warming issues. However, iron catalysts typically produce olefin-rich hydrocarbons, which make it difficult to directly use them as liquid transportation fuels. Here, we present a bimetallic Na–Fe 0.9 Mg 0.1 O x catalyst that produced paraffin-rich long-chain hydrocarbons with a high C 5+ yield of 17.9% at a high CO 2 conversion of 42.1%. The formation of oxygen vacant sites at the catalyst surface and electron transfer from MgO to Fe phase increased the reducibility of Fe 3 O 4 to α–Fe. In addition, the presence of MgO increased the H 2 and CO 2 adsorption and facilitated the C–C coupling reaction to produce long-chain paraffins. The high CO 2 conversion, high C 5+ yield, and paraffin-rich products make Fe 0.9 Mg 0.1 O x a highly promising catalyst to produce liquid transportation fuels under industry-relevant conditions.