Ni/support-CaO bifunctional combined materials for integrated CO2 capture and reverse water-gas shift reaction: Influence of different supports

Integrated CO2 capture and utilisation (ICCU) is a promising strategy for restricting carbon emissions achieving neutrality. Bifunctional combined materials (BCMs), containing adsorbents active catalysts, are widely applied in this process. Producing syngas via reverse water–gas shift reaction (RWGS) integrating with Fischer-Tropsch (F-T) synthesis an attractive valuable route. This work investigated series of Ni/support-CaO BCMs (supports = ZrO2, TiO2, CeO2 Al2O3) the integrated RWGS (ICCU-RWGS) The were prepared by physically mixing various metal oxide supports loaded Ni sol–gel derived CaO. ICCU-RWGS performance (CO2 conversion, CO yield generation rate) these followed order during tested conditions (550–750 °C): Ni/CeO2-CaO > Ni/TiO2-CaO Ni/ZrO2-CaO Ni/Al2O3-CaO. A comprehensive characterisation Ni/support showed that Ni/CeO2 had characteristics stronger basicity, optimal dispersion improved NiO reducibility, which led to outperforming activity over (e.g. 56.1% 2.68 mmol g?1 ?100% selectivity at 650 °C). Furthermore, BCM stable, yet, self-optimising catalytic cyclic 20 cycles. TEM suggested was ascribed volume expansion shrinkage CaO adsorption–desorption altering distance between adsorbent Ni/CeO2, resulting enhanced conversion cycle.