Cycling performance of composite hematite and copper ore oxygen carrier in chemical looping combustion

Miao, Zhenwu; Shen, Laihong; Zhao, Haibo

doi:10.1016/j.cej.2022.139224

Cited by 10 publications

(2 citation statements)

References 44 publications

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“…Therefore, researchers have tried to find new technologies to reduce carbon dioxide capture costs . Chemical looping combustion (CLC) is a process for producing heat, electricity, and other forms of energy through combustion. − It involves circulating a solid material, known as an OC, between two reactors: the fuel reactor and the air reactor. , In the fuel reactor, the solid OC reacts with the injected fuel, leading to the production of carbon dioxide and water. The reduced OC is then transferred to the air reactor to gain oxygen.…”

Section: Introductionmentioning

confidence: 99%

Chemical Looping Combustion over Yolk–Shell-Type Alumina-Based Oxygen Carrier: Catalytic Structure and Process Activity

Daneshmand-jahromi,

Sedghkerdar,

Karami

et al. 2024

Energy Fuels

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Chemical looping combustion (CLC) is an innovative cyclic process for fuel combustion to intrinsically separate carbon dioxide. In this process, oxygen and fuel are contacted by an intermediate oxygen carrier (OC), a metal oxide/metal that can alternately be reduced and oxidized. In this study, a yolk (Al2O3)–shell (ZrO2) was synthesized as the support of the OC and 20 wt % copper oxide was impregnated on the surface of it. The structure and cyclic reduction–oxidation (redox) performance of the CuO-impregnated yolk–shell sample were compared with those of CuO-impregnated core (Al2O3)–shell (ZrO2) and CuO-impregnated alumina oxygen carriers in the CLC process. The synthesized OCs were characterized by Brunauer–Emmett–Teller (BET) surface area, X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy-dispersive X-ray spectroscopy (EDX) dot mapping. A homogeneous coating of the zirconia on the alumina was obtained for the yolk–shell material. The pore size distribution became narrow in the presence of the zirconia coating. Furthermore, a yolk–shell architecture prevented the contact between the yolk (Al2O3) and the copper oxide materials, and CuAl2O4 spinel formation was inhibited. The obtained results showed that the oxygen transport capacities of the 20CuO/Al–C@Zr (yolk–shell support), 20CuO/Al@Zr (core–shell support), and 20CuO/Al oxygen carriers are 3.80, 3.47, and 3.4 wt %, respectively. The oxygen carrier with the yolk–shell support exhibited the highest activity, oxygen transport capacity, and coke formation resistance.

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Section: Introductionmentioning

confidence: 99%

Chemical Looping Combustion over Yolk–Shell-Type Alumina-Based Oxygen Carrier: Catalytic Structure and Process Activity

Daneshmand-jahromi,

Sedghkerdar,

Karami

et al. 2024

Energy Fuels

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“…Typically, different metal oxides mixed into one OC particle at appropriate ratios can improve the chemical and physical properties of OCs and then exhibit better performance. Some researchers have found that Cu–Fe composite OCs show synergistic effects in enhancing the reactivity of Fe-based OCs and resisting agglomeration of Cu-based OCs. − More importantly, since the whole reaction process in the fuel reactor is endothermic, an extremely high solid circulation rate (e.g., 25.5 kg/m 2 /s) is required to realize the autothermal operation of the CLC process, which the current CLC units cannot reach. It is well known that the reduction process of synthesis gas with CuO is exothermic, while that of Fe 2 O 3 is endothermic.…”

Section: Introductionmentioning

confidence: 99%

Reduction Kinetics of Low-Cost Cu/Fe-Based Oxygen Carriers in Chemical Looping Mode

Li,

Wang,

Liu

et al. 2023

Energy Fuels

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Cu–Fe bimetallic oxides have been proposed as promising OC candidates in chemical looping combustion (CLC) due to their high reactivity and resistance to sintering, and the reduction kinetics of the Cu–Fe composite OCs is significantly essential. In this article, several low-cost Cu/Fe-based OCs are prepared using fine natural ores or red mud as raw materials. Among these OCs, the composite OC with thermal neutrality is determined by reduction investigation within the typical CLC temperature range. The heat flow curves indicate that the autothermal balance could be achieved when the mixing ratio of copper ore to hematite is 20:80 (i.e., Cu20Fe80@C), which further guides the design of the copper ore/red mud composite OC (i.e., Cu10.9Red89.1@C). Subsequently, 50 cyclic redox tests are performed to evaluate the reaction stability of these OCs, and the results show that the composite OCs (i.e., Cu20Fe80@C and Cu10.9Red89.1@C) exhibit a better cyclic stability as well as a higher oxygen transfer rate than those of pure Fe-based materials (i.e., red mud and Fe100@C). Moreover, the reduction kinetics of these OCs is studied in detail at both high- and low-temperature conditions. It is found that the OC reduction data obtained from high temperatures (750–950 °C) are inappropriate for analyzing the kinetic parameters, whose process is likely to be dominated by gas diffusion in the particle boundary layer. At low temperatures (400–610 °C), the reduction of all targeted OCs can be described by the shrinking core model, and the pure Fe-based OCs correspond to the mechanism function of G(X) = 1 – (1 – X)1/3, while that is G(X) = 1 – (1 – X)1/2 for the composite OCs. Additionally, it should be noted that the composite OCs present lower activation energy than their corresponding pure Fe-based OCs. In summary, this study shows the superiority of composite OCs in terms of cyclic reactivity and kinetic parameters, which will further guide and optimize the design of low-cost OCs.

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Sintering and agglomeration characteristics of industrially prepared CaMn0.5Ti0.375Fe0.125O3-δ perovskite oxygen carrier in chemical looping combustion

Miao

Shen

et al. 2023

Chemical Engineering Journal

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Cycling performance of composite hematite and copper ore oxygen carrier in chemical looping combustion

Cited by 10 publications

References 44 publications

Chemical Looping Combustion over Yolk–Shell-Type Alumina-Based Oxygen Carrier: Catalytic Structure and Process Activity

Chemical Looping Combustion over Yolk–Shell-Type Alumina-Based Oxygen Carrier: Catalytic Structure and Process Activity

Reduction Kinetics of Low-Cost Cu/Fe-Based Oxygen Carriers in Chemical Looping Mode

Sintering and agglomeration characteristics of industrially prepared CaMn0.5Ti0.375Fe0.125O3-δ perovskite oxygen carrier in chemical looping combustion

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