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Enhanced reduction of CO2 to CH4 by novel mesoporous Ru-Fe3O4/CeOx-SiO2 catalyst in a fixed bed reactor
  • Shyamal Roy,
  • Dilip Mondal
Shyamal Roy
Jadavpur University Faculty of Engineering and Technology

Corresponding Author:[email protected]

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Dilip Mondal
Jadavpur University Faculty of Engineering and Technology
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Abstract

A novel mesoporous Ru-Fe3O4/CeOx-SiO2 (Ce3+/Ce4+, x=1.64) catalyst was synthesized via excess solution impregnation of Ru and Fe3O4 nanoparticles (NPs) on ceria-loaded mesoporous SBA-15. The reduction of CO2 to methane was performed in the presence of H2 over the catalyst in a fixed bed reactor. CO2 reduction was found to be 82% at 0.25 wt% ruthenium loading, 2.5 wt% iron loading, 573 K temperature, 20 bar pressure, 3000 mL.g.-1. h-1 gas hour space velocity and H2 to CO2 mole ratio of 5:1. The close contact between ruthenium and Fe3O4 nanoparticles facilitated the reduction of CO2 through hydrogen spill-over effect and ceria NPs acted as a promoter for reduction reaction. The catalysts were characterized thoroughly using CO chemisorption, BET, TPR, TPD, XRD, SEM, HR TEM, ICP-AES and XPS techniques. Optimal process conditions could render much higher CO2 conversion efficacy for selective methane synthesis in comparison with previous scientific investigations.