Direct Conversion of Co2 to Liquid Fuels Using Novel Fe-Based and Zeolite Multifunctional Catalysts Via a Direct Fischer-Tropsch Synthesis Pathway

The CO2 hydrogenation to liquid fuels not only reduces CO2 emissions but also provides an alternative method for value-added chemical synthesis. Here, we have developed a multifunctional catalyst consisting of iron-based catalyst and hollow zeolite H-ZSM-5 which performed for the direct hydrogenation of CO2 to aromatics. The Na-FeGaZr catalyst, prepared by hydrothermal synthesis, accelerated the formation of highly active site Fe5C2. Subsequently, the generated olefins converted to aromatics through the dehydrogenation and cyclization reactions at the acid sites of H-ZSM-5 whose hollow structures enabled them to be rapidly diffused. It had a remarkable catalytic performance, with high aromatic selectivity obtained for the products while efficiency converting CO2. Furthermore, the synthetic liquid fuel showed intimate compatibility with commercial gasoline through the estimation of gasoline quality standard values (octane number, density, distillation characteristics) with GC-MS measurements. Consequently, our multifunctional catalysts could contribute to the development of carbon-neutral fuels and alleviate the energy crisis.