Dual functional catalytic materials of Ni over Ce-modified CaO sorbents for integrated CO2 capture and conversion.

Graphical abstract An efficient Ce-promoted one-pot synthesized multifunctional catalytic material for integrated carbon capture and conversion to CO is reported with high stability and CO 2 conversion. Highlights • Dual functional Ni-Ca materials are developed with the promotion of Ce. • Simultaneous sorbent regeneration and CO production is demonstrated. • Catalyst with a Ca/Ni/Ce molar ratio of 1:0.1:0.033 displays almost 100% CO selectivity and 51.8% CO 2 conversion. • 20 stable cycles of integrated CO 2 capture and conversion is obtained. Abstract Excessive anthropogenic CO 2 emission in the atmosphere is considered as one of the main contributions to the serious climate changes. However, with the growth of global economics, more fossil fuels will be consumed to feed the global activity, especially in developing countries. Thus, CO 2 needs to be captured for storage or converted to fuels or value-added chemicals. Herein, we propose and demonstrate a one-pot method synthesized dual functional materials (DFMs), which contain a sorbent coupled with a catalyst component, allowing the sorbent regeneration and CO 2 conversion to CO are performed simultaneously in a single reactor. This process requires no additional thermal energy for the regeneration of sorbents. In addition, CeO 2 is incorporated into the DFMs to largely enhance the stability of the materials for the process, and the influence of different Ce loadings on the performance of integrated CO 2 capture and conversion is studied. It is found that the DFMs with a Ca/Ni/Ce molar ratio of 1:0.1:0.033 displays almost 100% CO selectivity and 51.8% CO 2 conversion in the reverse water-gas shift (RWGS) reaction and a remarkable cyclic stability after 20 cycles of integrated CO 2 capture and conversion. Therefore, the incorporation of Ce into DFMs has two profits, for one thing, the oxygen vacancies generated by CeO 2 directly reduces the dissociated CO 2 regenerated from the DFMs, demonstrating the high CO yield; for another, the well-dispersed CeO 2 , which could act as a physical barrier, effectively prevents the growth and agglomeration of CaO crystallite and NiO species. [ABSTRACT FROM AUTHOR]