Hydrotalcite-Derived Copper-Based Oxygen Carrier Materials for Efficient Chemical-Looping Combustion of Solid Fuels with CO<sub>2</sub> Capture

High, Michael; Patzschke, Clemens F.; Zheng, Lai; Zeng, Dewang; Xiao, Rui; Fennell, Paul S.; Song, Qilei

doi:10.1021/acs.energyfuels.2c02409

Cited by 11 publications

(5 citation statements)

References 63 publications

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“…The fuel and air need not be in contact, and the oxygen in the air will be transferred to the fuel by OCs. − Chemical looping of oxygen uncoupling (CLOU) is a variant of chemical looping that accelerates fuel conversion through the release of gaseous O 2 from OC itself, resulting in a higher fuel conversion rate. , As an important part of the CLOU, the performance of OCs affects the entire process. OCs should have the following characteristics: strong oxygen absorption, release ability, high activity, high mechanical strength, etc. − Copper-based OCs have attracted much attention because of the high reactivity and high oxygen loading rate. − …”

Section: Introductionmentioning

confidence: 99%

Characterization of NO_x Release during Combustion Synthesis and Cyclic Reaction Performance of Cu-Based Oxygen Carriers Prepared with Citric Acid

Huang,

Zheng,

Wang

et al. 2024

Energy Fuels

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Chemical looping combustion technology has received attention as a novel combustion technology. In this paper, anhydrous citric acid was selected as the complexing agent and copper-based oxygen carriers (OCs) were prepared by the combustion synthesis method. The characteristics of NO x release during the combustion synthesis of copper-based OCs were investigated by citric acid addition. The NO release decreased significantly as the molar ratio of citric acid and Cu(NO 3 ) 2 •3H 2 O (R) increased. The peak NO concentration decreased from 100 to almost 0 ppm. The peak NO 2 concentration was maintained in the range 0−4 ppm. When R was less than 1.00, the products of copperbased OC precursor combustion were mainly NO, with very little generation of NO 2 . When R reached 1.25, only a very small amount of NO 2 was produced, and NO was negligible. The redox properties of the prepared copper-based OCs during 10 cycles were explored. The copper-based OCs all had stable redox properties in cycles. In each reduction, the peak CO 2 concentration was 3% and above. The CH 4 conversion rate and CO 2 yield were maintained at about 80% during the 10 cycles. The CO 2 selectivity was maintained at 95% and above. Among them, OC5 (R: 1.25) had the best redox capacity.

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Section: Introductionmentioning

confidence: 99%

Characterization of NO_x Release during Combustion Synthesis and Cyclic Reaction Performance of Cu-Based Oxygen Carriers Prepared with Citric Acid

Huang,

Zheng,

Wang

et al. 2024

Energy Fuels

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“…Copper-based OCs are considered attractive due to their high oxygen capacity, cost-effectiveness, and high thermal stability. − However, a significant challenge reported with the use of copper-based OCs is that the melting point of copper is close to the operating temperature that is utilized in the CLC process. Therefore, the OCs showed thermal sintering and agglomeration during the process. − To improve the mechanical strength, reactivity, and attrition resistance of CuO, it is common to use OCs on a support. In the scientific literature, Al 2 O 3 is often utilized for this purpose, because it can provide a high surface area to prevent the agglomeration of copper oxide. − The main problem with the alumina support is its interaction with CuO, affecting the rates of reaction and capacity in CLC.…”

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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“…In the fuel reactor, the gas/liquid/solid fuels are oxidized by the oxygen released from an oxygen carrier, producing concentrated CO 2 while reducing the oxygen carrier in the meantime. Copper-based oxygen carriers have the advantages of high O 2 release rate, high oxygen transport capacity, high CO 2 capture efficiency, moderate price, nontoxic, etc., and thus have been widely investigated for CLOU. − …”

Section: Introductionmentioning

confidence: 99%

Tracking Atomic Diffusion in Surface and Bulk CuO via Neural Network-Based Molecular Dynamics

Liu

Qin

et al. 2023

J. Phys. Chem. C

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Understanding the atomic diffusion process of a metal oxide helps with the design of more effective oxygen carriers for chemical looping with oxygen uncoupling (CLOU). Herein we investigated the atomic diffusion process in both slab and bulk CuO with varying oxygen vacancy (V O ) under CLOU conditions using density functional theory (DFT) calculations and molecular dynamic (MD) simulation based on the neural network (NN) potential. Although the diffusions of both the Cu and the O atoms are important for the slab model, the O atoms' outward diffusion to fill surface V O dominates the interlayer diffusion. In contrast, Cu atoms barely diffuse in the bulk model, and the diffusion process is dominated by O atoms through the V O . The MD-estimated chemical diffusion coefficients (10 −9 −10 −13 m 2 /s) and activation barriers (1.14−1.34 eV) of both models are consistent with those experimentally measured values. The diffusion coefficient increases with increasing V O , and the values of the slab model are two orders of magnitude higher than those of the bulk model with a similar V O . These results indicate that the chemical diffusion is dominated by the surface instead of the bulk, and the diffusion in the bulk only becomes important when it becomes the frontier of oxygen uncoupling, i.e., grain boundary between CuO and Cu 2 O. The majority of diffusion species (O atom or vacancy) and process revealed in this study provide atomic insight into the diffusion in CuO-based materials.

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Hydrotalcite-Derived Copper-Based Oxygen Carrier Materials for Efficient Chemical-Looping Combustion of Solid Fuels with CO₂ Capture

Cited by 11 publications

References 63 publications

Characterization of NO_x Release during Combustion Synthesis and Cyclic Reaction Performance of Cu-Based Oxygen Carriers Prepared with Citric Acid

Characterization of NO_x Release during Combustion Synthesis and Cyclic Reaction Performance of Cu-Based Oxygen Carriers Prepared with Citric Acid

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

Tracking Atomic Diffusion in Surface and Bulk CuO via Neural Network-Based Molecular Dynamics

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Hydrotalcite-Derived Copper-Based Oxygen Carrier Materials for Efficient Chemical-Looping Combustion of Solid Fuels with CO2 Capture

Cited by 11 publications

References 63 publications

Characterization of NOx Release during Combustion Synthesis and Cyclic Reaction Performance of Cu-Based Oxygen Carriers Prepared with Citric Acid

Characterization of NOx Release during Combustion Synthesis and Cyclic Reaction Performance of Cu-Based Oxygen Carriers Prepared with Citric Acid

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

Tracking Atomic Diffusion in Surface and Bulk CuO via Neural Network-Based Molecular Dynamics

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Product

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Hydrotalcite-Derived Copper-Based Oxygen Carrier Materials for Efficient Chemical-Looping Combustion of Solid Fuels with CO₂ Capture

Characterization of NO_x Release during Combustion Synthesis and Cyclic Reaction Performance of Cu-Based Oxygen Carriers Prepared with Citric Acid

Characterization of NO_x Release during Combustion Synthesis and Cyclic Reaction Performance of Cu-Based Oxygen Carriers Prepared with Citric Acid