Catalytic Synthesis of CO by Combining CO2 Capture and Hydrogenation over Three-Dimensional Ni/CaO Networks

Three-dimensionalNi/CaO networks were synthesized using a precipitation-combustionmethod and applied for the combined CO2 capture and catalytichydrogenation as dual functional materials. NiO species were highlydispersed in the CaO substrate and generated small metallic Ni nanoparticlesupon reduction with H-2. It was found that, compared withpure CaO, the addition of Ni not only greatly lowered the reactiontemperature of calcium carbonate species with H-2 to CH4 and/or CO but also enhanced the conversion rate of calciumcarbonate species, resulting in the clear increase in the productivityof CO. Ni/CaO exhibited excellent cyclic stability with a CO2 adsorption capacity of 9.7 mmol/g and a CO2 conversionof 57.5% after 20 cycles for the combined CO2 capture andhydrogenation, which was due to the elasticity of the three-dimensionalnetwork structure consisting of meso- and macropores to inhibit thegrowth and sintering of CaO particles.

Automated summary

Three-dimensional Ni/CaO networks were synthesized and used as dual functional materials for combined CO2 capture and catalytic hydrogenation. The addition of Ni dispersed in CaO substrate significantly lowered the reaction temperature and enhanced the conversion rate of calcium carbonate species, resulting in increased productivity of CO. Ni/CaO exhibited excellent cyclic stability due to the three-dimensional network structure inhibiting particle growth and sintering of CaO particles.