(2ej) Effect of CO2-Pretreatment on Reverse Water Gas Shift (rWGS) Using Ni-Doped CaTiO3/CaO
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2023
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Reverse water-gas shift (rWGS) that converts CO2 to CO is one of the most important parts in the CO2 utilization to produce various CO2-derived chemicals and hydrocarbon fuels. However, the rWGS is accompanied by undesired CH4 formation over the catalysts due to the excessive hydrogenation of CO to CH4. Here, Ni-doped CaTiO3/CaO were developed and in-situ exsolved Ni was dispersed evenly throughout host CaTiO3 perovskite. 100% CO selectivity can be achieved even at low temperatures and high H2/CO2 ratio because of strong metal support interaction (SMSI) between Ni and CaTiO3 and small Ni crystallite size. Moreover, CO2 conversion can be enhanced by absorbing CO2 as a formation of CaCO3 prior to rWGS. During the rWGS, increase in CO2 coverage by CO32- spillover from CaCO3 can increase CO2 conversion.
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