Abstract
The conversion of syngas (CO + H2) to gasoline-ranged hydrocarbons was carried out using a hybrid catalyst consisting of metal-loaded ZSM-5 coupled with Cu-ZnO in a near-critical n-hexane solvent. Methanol was synthesized from syngas over Cu-ZnO; subsequently, was converted to hydrocarbons through the formation of dimethyl ether (DME) over the metal-loaded ZSM-5. When 0.5 wt% Pd/ZSM-5 and 5 wt% Cu/ZSM-5 among the metal-loaded ZSM-5 catalysts with Pd, Co, Fe or Cu were employed as a portion of the hybrid catalyst, the gasoline-ranged hydrocarbons were selectively produced (the gasoline-ranged hydrocarbons in all hydrocarbons: 59% for the hybrid catalyst with Pd/ZSM-5 and 64% for that with Cu/ZSM-5) with a similar CO conversion during the reaction. An increase in the Cu loading on ZSM-5 resulted in increasing the yield of the gasoline-ranged hydrocarbons, and in decreasing the yield of DME. Furthermore, the hybrid catalyst with Cu/ZSM-5 exhibited no deactivation for 30 h of the reaction. It was revealed that a hybrid catalyst containing Cu/ZSM-5 was efficient in the selective synthesis of gasoline-ranged hydrocarbons from syngas via methanol in the near-critical n-hexane fluid.
Highlights
Accompanying an increase in worldwide energy consumption, demands for specified liquid fuels such as gasoline, jet fuel and diesel fuel have highly increased
Saturated hydrocarbons are produced from syngas over a hybrid catalyst consisting of Cu-ZnO and a metal-loaded ZSM-5 as follows: (1) the conversion of syngas to methanol over Cu-ZnO; (2) the subsequent conversion of the generated methanol to hydrocarbons through the formation of dimethyl ether (DME) over the acid sites of ZSM-5; and (3) the hydrogenation of primarily produced unsaturated hydrocarbons to saturated hydrocarbons over metal species on ZSM-5
The catalytic properties of a hybrid catalyst consisting of Cu-ZnO and metal-loaded ZSM-5 were investigated in the conversion of syngas to hydrocarbons in a near-critical n-hexane solvent
Summary
Accompanying an increase in worldwide energy consumption, demands for specified liquid fuels such as gasoline, jet fuel and diesel fuel have highly increased. It is expected that by employing zeolites with optimal pore sizes, the process through the MTH reaction is capable of the selective production of hydrocarbons from syngas. Fraction from syngas was achieved by employing hybrid catalysts composed of a methanol synthesis catalyst, e.g., Cu-ZnO and Cr-ZnO, and a metal-loaded zeolite catalyst [12,13,14]. We have previously reported that a near-critical n-hexane solvent improved the yield of hydrocarbons in the syngas conversion to hydrocarbons via methanol over the hybrid catalyst consisting of Cu-ZnO and the Pd-loaded zeolite because of a good heat transfer in the reaction system under the near-critical solvent flowing [15,20]. We investigated the catalytic activity of hybrid catalysts composed of Cu-ZnO and metal-loaded ZSM-5 in a near-critical n-hexane solvent in the conversion of syngas to hydrocarbons via methanol. We investigated the effects of the metal loading on the hydrocarbon formation, in gasoline-ranged hydrocarbons yield, as well as the durability during the reaction
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
