MxOy (M 1/4 Mg, Zr, La, Ce) modified Ni/CaO dual functional materials for combined CO2 capture and hydrogenation

The integrated CO2 capture and utilization has recently attracted attention as a promising approach to reduce CO2 emissions as well as produce value-added chemicals and fuels. Herein, metal oxides (MxOy, M 1/4 Mg, Zr, La, and Ce) modified Ni/CaO dual functional materials (M-Ni/Ca DFMs) were synthesized and applied to the combined CO2 capture and hydrogenation using a single reactor at one temperature. The La-Ni/Ca showed the highest CO2 adsorption capacity (13.8 mmol/g), CO2 conversion (64.3%) and CO yield (8.7 mmol/g). Results indicated that the addition of metal oxides increased the number of basic sites which played important role in efficient CO2 capture. The high activities of M-Ni/Ca were attributed to the formation of highly dispersed small-sized Ni particles. Furthermore, the La-Ni/Ca exhibited excellent cyclic stability after 20 cycles due to the La2O3 as a physical barrier and a support for inhibiting the growth and sintering of CaO and Ni particles.& COPY; 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

Metal oxide-modified Ni/CaO dual functional materials (M-Ni/Ca DFMs) demonstrate excellent performance in CO2 capture and hydrogenation, especially La-Ni/Ca with the highest CO2 adsorption capacity, conversion, and CO yield. The addition of metal oxides increases the number of basic sites, playing a crucial role in efficient CO2 capture. The outstanding cyclic stability of La-Ni/Ca is attributed to the presence of La2O3, which inhibits the growth and sintering of CaO and Ni particles.