Understanding of the oxygen uncoupling characteristics of Cu Fe composite oxygen carriers for chemical-looping gasification

Abstract

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Review on the Theoretical Understanding of Oxygen Carrier Development for Chemical-Looping Technologies

“…As revealed in Figure b, the existence of the Cu element can obviously reduce the energy barrier for CO oxidation. Other works also confirmed a spinel composite oxygen carrier with low temperature reactivity. ,, When on CoFe 2 O 4 surfaces, CO adsorption prefers the Co top site or Co–O bridge site while CO oxidation is energetically favorable beginning at the Fe top site or Fe–O bridge site. In particular, the surface O bonded with the tetrahedral Cu atom on the CuMn 2 O 4 (100) surface still exhibits the highest reactivity with CO.…”

“…Another effective method to improve the reactivity of the less active oxygen carrier is elemental doping. The addition of some metal elements or components can not only increase the reactivity of the oxygen carrier − and lower the reaction temperature but also inhibit the carbon deposition, increase the selectivity of the reaction product, , as well as improve the cycle stability of the oxygen carrier. DFT calculations can be used to explain the influence mechanism of doping elements on the performance of oxygen carriers.…”

“…Other works also confirmed a spinel composite oxygen carrier with low temperature reactivity. 57,90,91 When on CoFe It should be noted that the phase segregation of composite oxygen carriers can be the main cause of deactivation. 92 Thus, it is important to understand the diffusion of metal cations through the metal oxide lattice.…”

An Unbiased Approach to Low Rank Recovery

“…In this way, the formed flue gases, mainly comprised of carbon dioxide and steam, are expected to exit the fuel reactor without being mixed with nitrogen. This is a clear advantage since nitrogen causes a significant decrease in the heating value of the generated flue gases from the fuel conversion [1]. Moreover, the capture of the carbon dioxide can hence be easily achieved through a simple condensation of steam, thus eliminating the need for an additional gas separation unit.…”