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

Abstract

Excessive anthropogenic CO2 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, CO2 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 CO2 conversion to CO to perform simultaneously in a single reactor. This process requires no additional thermal energy for the regeneration of sorbents. In addition, CeO2 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 CO2 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 an excellent CO yield (7.24 mmol g -1 ) in the reverse water-gas shift (RWGS) reaction and a remarkable cyclic stability after 20 cycles of integrated CO2 capture and conversion. Therefore, the incorporation of Ce into DFMs has two profits, for one thing, the oxygen vacancies generated by CeO2 directly reduces the dissociated CO2 regenerated from the DFMs, demonstrating the high CO yield; for another, the well-dispersed CeO2, which could act as a physical barrier, effectively prevents the growth and agglomeration of CaO crystallite and NiO species.

The Role of Alkali and Alkaline Earth Metals in the CO2 Methanation Reaction and the Combined Capture and Methanation of CO2

“…Additionally, Sun et al [125] employed a common CO 2 sorbent, CaO, directly as support material for Ni nanocatalysts with adjacent Ce-species. They argued that the already established calcium-looping process that rests on the carbonization and calcination of CaO for CO 2 capture and sequestration (CCS) could be modified through the integration of a CO 2 utilization step by converting CO 2 to CO.…”

Ceria-Based Materials in Hydrogenation and Reforming Reactions for CO2 Valorization

“…The metal-support interaction (Panaritis et al, 2018; Ronda-Lloret et al, 2018; Wang and Liu, 2018) as well as the effect of ceria in the dispersion of the active phase (Wang et al, 2013; Lu and Kawamoto, 2014; Wang L. et al, 2017; Sun et al, 2019) have a strong effect on the activity for the RWGS reaction. The role of ceria in dispersing the active phase seems particularly relevant in determining the selectivity toward CO.…”

Direct and highly selective conversion of captured CO2 into methane through integrated carbon capture and utilization over dual functional materials

“…sorbent attrition [7]. Recently, an integrated carbon capture and utilization (ICCU) process has been proposed to combine the regeneration of sorbent and catalytic conversion of the captured CO2 in a single fixed bed reactor under isothermal conditions [8][9][10], which can reduce the energy required for sorbent regeneration, the infrastructure to transport and store captured CO2.…”

“…( 1) is a promising reaction for the utilization of CO2 because carbon monoxide (CO) acts as a feedstock to produce fuels and chemicals via Fischer-Tropsch process [11,12]. In our previous work, the ICCU process has been proven for the CO production [8]. The captured CO2 was converted into CO in a single reactor under isothermal conditions using one-pot method synthesized DFMs, which exhibited a good stability after 20 cycles of ICCU process.…”