Higher Hydrocarbons Synthesis from CO2 Hydrogenation Over K- and La-Promoted Fe–Cu/TiO2 Catalysts
Developing selective and active catalyst is critical for CO2 hydrogenation to higher hydrocarbons especially C5+ products. The present work reports on the significant promoting effects of K and La addition to Fe–Cu/TiO2 catalyst on higher hydrocarbon production from CO2 hydrogenation. The incorporation of both K and La promoters can improve both CO2 hydrogenation activity and selectivity to higher hydrocarbons of Fe-based catalyst. Characterization by temperature-programmed desorption (TPD) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) showed that the presence of K promoter significantly decreased the adsorption of H2, which suppressed the CH4 formation. On the other hand, La addition can promote the moderately adsorbed CO2 species (mainly monodentate carbonate species), which leads to the enhanced C5–C7 selectivity. The simultaneous use of promoters La and K can tailor the H and C coverage on the catalyst surface, which plays an important role in altering product distribution in CO2 hydrogenation.
KeywordsCO2 hydrogenation Fe–Cu bimetallic catalyst K/La promotion Adsorption properties
This work was supported in part by the Pennsylvania State University through the EMS Energy Institute and the Penn State Institute of Energy and the Environment. One of the authors, Nuttakorn Boreriboon, acknowledges the financial support from the Thailand Research Fund through the Royal Golden Jubilee Ph.D. Program Scholarship. We are grateful for the helpful discussion and assistance provided by Wenjia Wang from Clean Fuels and Catalysis Program (CFCP) in the EMS Energy Institute at Penn State.
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