Effect of sintering on the reactivity of copper-based oxygen carriers synthesized by impregnation

Maya, Juan C.; Bhatia, Suresh K.

doi:10.1016/j.ces.2016.12.073

Cited by 9 publications

(3 citation statements)

References 34 publications

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“…19 The oxygen carrier can only activate methane better at high temperatures, which tends to lead to sintering. 20,21 Other methods of lowering the temperature for methane activation need to be explored. The key to the oxidative coupling and conversion of methane at low temperatures is the selective activation of the C−H bond in methane and the controlled radical reaction.…”

Section: Introductionmentioning

confidence: 99%

Over 90% C₂₊ Selectivity in Kalium-Doped Manganese Perovskite Oxygen Carriers for Chemical Looping Oxidative Coupling of Methane with Plasma Assistance

Zeng,

Liu,

Wang

et al. 2023

Energy Fuels

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Plasma-assisted chemical looping oxidative coupling of methane is a potential route for the conversion of methane into value-added C2+ hydrocarbons under mild conditions. However, the low C2+ selectivity of traditional oxygen carriers limits further development. In this study, we report a series of kalium-doped LaMnO3 oxygen carriers. The optimal doping level of kalium is found to be 1.0%, resulting in a C2+ selectivity of 92.67% at 400 °C, and the performance remained stable after 20 redox cycles. Mechanistic studies show that 1.0% kalium doping inhibits the migration of lattice oxygen (O2 2–) from bulk to the surface and the subsequent evolution of surface oxygen from electrophilic species (O–) to nucleophilic species (O2–). Therefore, the nucleophilic oxygen species (O2–) responsible for the overoxidation of the products was limited and in turn achieved a higher C2+ selectivity.

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Section: Introductionmentioning

confidence: 99%

Over 90% C₂₊ Selectivity in Kalium-Doped Manganese Perovskite Oxygen Carriers for Chemical Looping Oxidative Coupling of Methane with Plasma Assistance

Zeng,

Liu,

Wang

et al. 2023

Energy Fuels

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“…As we know, metal oxides or hydroxides can be prepared using several methods, such as coprecipitation, 27,28 impregnation, 29,30 hydrothermal technique, 31,32 and sol-gel method. 33,34 The physicochemical properties and surface-interface structures of the resulting materials are significantly influenced by the preparation approach employed because of the different growth modes of the particles, which govern their overall performance.…”

Section: ■ Introductionmentioning

confidence: 99%

“…As we know, metal oxides or hydroxides can be prepared using several methods, such as coprecipitation, , impregnation, , hydrothermal technique, , and sol-gel method. , The physicochemical properties and surface-interface structures of the resulting materials are significantly influenced by the preparation approach employed because of the different growth modes of the particles, which govern their overall performance. Recently, we have developed a coprecipitation method using a microliquid-film (MLF) reactor to create supported Cu-based catalysts. , During catalyst precursor preparation, numerous small Cu–Zr–Ce mixed hydroxide particles were quickly and instantaneously produced in the MLF reactor .…”

Section: Introductionmentioning

confidence: 99%

Defective MnO_x Supported Copper Nanocatalyst Fabricated via a Microliquid-Film Reactor for Ethanol Dehydrogenation

Tan,

Fan,

Wang

et al. 2023

Ind. Eng. Chem. Res.

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Currently, the depletion of fossil fuels has become a pressing issue for society, and one potential solution is the conversion of ethanol, a vital biomass derivative, into high-value chemicals using tandem reactions based on anaerobic dehydrogenation processes. Here, we developed a new copper nanocatalyst supported on a defect-rich MnO x matrix, fabricated by a modified coprecipitation method using a microliquid-film (MLF) reactor. By enhancing the micromixing of Mn and Cu ions in the synthesis solution, the use of the MLF reactor promoted the dispersion of copper particles with favorable interfacial Cu + −O−Mn structures and the formation of defect-rich MnO x support with abundant oxygen vacancies. The as-fabricated Cu/MnO x catalyst delivered a higher yield of acetaldehyde and greater structural stability, compared to two Cu-based catalysts produced using traditional impregnation and coprecipitation methods. Surface defective oxygen vacancies and interfacial Cu + −O−Mn structures were found to effectively facilitate the activation adsorption of ethanol and stabilize the formed ethoxy intermediate, improving the dehydrogenation of ethanol to produce acetaldehyde. This work presents a novel synthesis strategy for supported metal catalysts, which enables the creation of active surface-interface structures, resulting in exceptional catalytic properties for use in various advanced catalytic processes.

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Calcium looping carbon capture: Progress and prospects

2022

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Carbon capture and utilization/storage is an integral part of a smooth transition to a net-zero energy portfolio. The distinctive advantages of the calcium looping (CaL) process, including low-cost and high-theoretical uptake capacity, make it a promising approach for the decarbonization of fossil fuel power plants and carbon-intensive industries, including cement and steel. CaL exploits the reversible reaction of CO 2 with CaO to capture and release carbon dioxide in a cyclic process. This paper reviews the fundamentals of the CaL process, the kinetics of the carbonation reaction, and extensive research on the development of sorbent materials with high durability for use in the CaL process. Various optimizing strategies for the improvement of the stability and CO 2 uptake capacity of materials are outlined. Lastly, an overview of benchand pilot-scale testing facilities around the world is provided. The characteristics, operating conditions, and the main experimental findings of the testing facilities are summarized.

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Effect of sintering on the reactivity of copper-based oxygen carriers synthesized by impregnation

Cited by 9 publications

References 34 publications

Over 90% C₂₊ Selectivity in Kalium-Doped Manganese Perovskite Oxygen Carriers for Chemical Looping Oxidative Coupling of Methane with Plasma Assistance

Over 90% C₂₊ Selectivity in Kalium-Doped Manganese Perovskite Oxygen Carriers for Chemical Looping Oxidative Coupling of Methane with Plasma Assistance

Defective MnO_x Supported Copper Nanocatalyst Fabricated via a Microliquid-Film Reactor for Ethanol Dehydrogenation

Calcium looping carbon capture: Progress and prospects

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Effect of sintering on the reactivity of copper-based oxygen carriers synthesized by impregnation

Cited by 9 publications

References 34 publications

Over 90% C2+ Selectivity in Kalium-Doped Manganese Perovskite Oxygen Carriers for Chemical Looping Oxidative Coupling of Methane with Plasma Assistance

Over 90% C2+ Selectivity in Kalium-Doped Manganese Perovskite Oxygen Carriers for Chemical Looping Oxidative Coupling of Methane with Plasma Assistance

Defective MnOx Supported Copper Nanocatalyst Fabricated via a Microliquid-Film Reactor for Ethanol Dehydrogenation

Calcium looping carbon capture: Progress and prospects

Contact Info

Product

Resources

About

Over 90% C₂₊ Selectivity in Kalium-Doped Manganese Perovskite Oxygen Carriers for Chemical Looping Oxidative Coupling of Methane with Plasma Assistance

Over 90% C₂₊ Selectivity in Kalium-Doped Manganese Perovskite Oxygen Carriers for Chemical Looping Oxidative Coupling of Methane with Plasma Assistance

Defective MnO_x Supported Copper Nanocatalyst Fabricated via a Microliquid-Film Reactor for Ethanol Dehydrogenation