Heterojunction-redox catalysts of Fe_xCo_yMg₁₀CaO for high-temperature CO₂ capture and in situ conversion in the context of green manufacturing

Abstract

A heterojunction-redox catalysis strategy is proposed for fabricating a dual-functional catalyst/adsorbent to realize integration of high-temperature CO2 capture and in situ conversion.

Recent advances in integrated CO2capture and utilization: a review

“…A similar trend in relation to the influence of temperature was also reported by Jo et al 43 using Ni/CaO DFMs. Shao et al 72 analyzed the temperature-programmed desorption of ICCU-RWGS using a FexCoyMg10CaO DFM and found that CO could be generated at 550 °C, which was earlier than CO2 release. Within a certain temperature range (< 650 °C), operating ICCU-RWGS at a higher temperature could generate more CO due to the release of more CO2.…”

“…In order to alleviate the sintering of CaO in cyclic adsorption and desorption, constructing a porous structure or better dispersion helps to improve the cycle performance of the adsorbent. The sol-gel method is a simple and effective way to synthesize porous materials, which was applied by Shao et al 72 and Sun et al .…”

“…the existing ICCU-RWGS research work, transition metal-based catalysts have shown excellent catalytic performance. Shao et al72 applied bimetallic Fe 3+ /Fe 2+ and Co 3+ /Co 2+ redox couples into a hierarchical porous CaO/MgO composite, and achieved an excellent ICCU-RWGS performance. The bimetallic couples significantly lowered the electric potential difference of Fe 3+ /Fe 2+ through the newly formed Fermi level in Fe5Co5Mg10CaO, which made the electron spillover easier to improve the catalytic activity.…”

“…Luis et al71 synthesized FeCrCu/K/MgO-Al2O3 DFMs for ICCU-RWGS under realistic conditions, and the key functions of Cu and K were suggested for efficient CO2 reduction and capture, respectively. CO2 conversion of RWGS39, 74, 76-88, 90-92, 94-117 and integrated CO2 capture and RWGS[71][72][73] .Supports can also play key roles in the catalytic process by promoting and stabilizing active catalytic sites. Sun et al73 synthesized Ni-CeO2/CaO DFMs and achieved almost 100% CO selectivity, 51.8% CO2 conversion and remarkable cyclic stability after 20 cycles of ICCU.…”

Upcycling the carbon emissions from the steel industry into chemicals using three metal oxide loops

“…via Fischer–Tropsch synthesis. 3,4 The reverse water–gas shift reaction (rWGS) is applicable to CO 2 from the iron and steel industry, one of the largest industrial emitters. 5 The outlet gas streams from the steel industry, responsible for around 70% of the sector's CO 2 emissions, 6 contain the necessary reactants for rWGS, i.e.…”