Journal
CHEMICAL ENGINEERING JOURNAL
Volume 477, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2023.147199
Keywords
CO2 capture and reduction (CCR); Reverse water gas-shift (RWGS) reaction; Ni-based dual functional material (DFM); Rubidium (Rb)
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Ni-based dual-functional materials (DFMs) have been extensively studied for CO2 capture and reduction with H2 (CCR); however, controlling the selectivity of CO2 hydrogenation to CH4 or CO is a challenge; in this study, Rb-Ni/Al2O3 is developed as an effective DFM for selective CO production through CCR at isothermal conditions, achieving high CO2 conversion and CO selectivity.
Ni-based dual-functional materials (DFMs) have been widely investigated for CO2 capture and reduction with H2 (CCR). However, controlling the selectivity of CO2 hydrogenation to CH4 or CO is a fundamental challenge. Most Ni-based DFMs favor the selectivity of CH4 over CO, although CO is more desirable than CH4 from a chemicalsynthesis perspective. In this study, Rb-promoted Ni nanoparticles on Al2O3, Rb-Ni/Al2O3, are developed as an effective DFM for selective CO production through CCR with a CO2 conversion of 68% and a CO selectivity of 97% under isothermal conditions at 450 degrees C in the mixture of O2 during CO2 capture process. The developed RbNi/Al2O3 is applicable to continuous CCR using double reactor system. The roles of Rb and Ni in CCR over Rb-Ni/ Al2O3 for CO formation are also discussed based on temperature-programmed surface reactions and in situ spectroscopic studies.
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