Determination of redox pathways of supported bimetallic oxygen carriers in a methane fuelled chemical looping combustion system

The development of efficient oxygen carriers (OCs) in chemical looping combustion (CLC) exhibited tremendous achievement considering inherent CO2 capture. The selectivity of CO2 in the CLC process depends on the performance of employed OCs during multiple redox cycles. Different types of OCs were prepared, including 5wt%Ni/5wt%Ce/γ‐Al2O3, 5wt%La/5wt%Ce/γ‐Al2O3, and 5wt%Pr/5wt%Ce/γ‐Al2O3, using the wet impregnation method and characterized by scanning electron microscopy/energy‐dispersive X‐ray spectroscopy, temperature‐programmed reduction, and thermogravimetric analysis (TGA). The redox reactivity of OCs was investigated through TGA and tubular furnace reactor. The as‐prepared OCs revealed higher thermal stability along with excellent oxygen capacity. Pr/Ce/γ‐Al2O3‐based OCs showed moderate oxygen capacity, which may increase by the addition of active metals.

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“…6b. No reduction peaks corresponding to La and γ ‐Al 2 O 3 were observed 37. These two peaks could represent the reduction of CeO 2 .…”

Section: Resultsmentioning

confidence: 92%

Preparation of Metal Oxide‐based Oxygen Carriers Supported with CeO₂ and γ‐Al₂O₃ for Chemical Looping Combustion

et al. 2021

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“…However, the main drawback of using Cu-based OCs is the agglomeration issue because the melting point of Cu is relatively low, which is indicated at 1085 °C . To improve the performance of Cu-based OCs, various supporting material such as CuO/SiO 2 , CuO/Al 2 O 3 , and CuO/olivine were tested.…”

Section: Oxygen Transport Capacity Of Various Oxygen Carriersmentioning

confidence: 99%

Recent Advances and Development of Various Oxygen Carriers for the Chemical Looping Combustion Process: A Review

Qasim

Ayoub

Ghazali

et al. 2021

Ind. Eng. Chem. Res.

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The amount of CO 2 in the atmosphere is rising due to the combustion of fossil fuels to fulfill the energy demand. The need to build cleaner and more efficient energy systems is motivated by the introduction of chemical looping combustion (CLC) as an alternative to conventional combustion by transferring oxygen. The transfer of oxygen from the air to fuel is carried out by a metal oxide known as an oxygen carrier (OC). For high fuel conversion and oxygen transport capacity, many efforts have been made for the preparation of an OC with minimal material cost. This review aims to summarize the recent advances and development of various types of OCs; particularly those developed within the previous five years are critically discussed in this paper. The main criteria for the selection of the OCs for CLC include their oxygen vacancies, oxygen transport capacities, costs, and tendencies over coke deposition, agglomeration, and attrition. OCs for CLC can be generally divided into single oxides, mixed oxides, natural mineral, spinel from mixed metal oxides, and perovskite. These have been critically discussed with their significance in CLC. The performances, advantages, and limitations of the OCs are presented and compared in detail.

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“…During discharge, at the anode, the zinc electrode reacts with hydroxide ion (OH − ) and oxidize to form zincate ion Zn(OH) 2− 4 , shown in Equation (6). Consequently, the precipitation of zinc oxide (ZnO) takes place when the dissolved zincate ion saturates and reaches its solubility, as shown in Equation (7).…”

Section: Zinc-air Battery Discharge Performancementioning

confidence: 99%

“…Zinc-air batteries are considered as the most promising alternative energy storage due to several advantages such as high theoretical specific energy density with a flat constant discharge voltage, the low reactivity of zinc, environmental safety and quick refueling with fresh zinc powder and granules. Moreover, the use of highly abundant and free oxygen as the reactant at the cathode does not require a heavy casing to keep it inside which generally makes the battery heavy and space consuming [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

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Catalytic Evaluation of Nanoflower Structured Manganese Oxide Electrocatalyst for Oxygen Reduction in Alkaline Media

et al. 2020

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An electrochemical nanoflowers manganese oxide (MnO2) catalyst has gained much interest due to its high stability and high specific surface area. However, there are a lack of insightful studies of electrocatalyst performance in nanoflower MnO2. This study assesses the electrocatalytic performances of nanoflower structure MnO2 for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in a zinc–air battery as a bifunctional electrocatalyst. The prepared catalyst was characterized in term of morphology, crystallinity, and total surface area. Cyclic voltammetry and linear sweep voltammetry were used to evaluate the electrochemical behaviors of the as-prepared nanoflower-like MnO2. The discharge performance test for zinc–air battery with a MnO2 catalyst was also conducted. The results show that the MnO2 prepared at dwell times of 2, 4 and 6 h were nanoflowers, nanoflower mixed with nanowires, and nanowires with corresponding specific surface areas of 52.4, 34.9 and 32.4 g/cm2, respectively. The nanoflower-like MnO2 catalyst exhibits a better electrocatalytic performance towards both ORR and OER compared to the nanowires. The number of electrons transferred for the MnO2 with nanoflower, nanoflower mixed with nanowires, and nanowire structures is 3.68, 3.31 and 3.00, respectively. The as-prepared MnO2 nanoflower-like structure exhibits the best discharge performance of 31% higher than the nanowires and reaches up to 30% of the theoretical discharge capacity of the zinc–air battery.

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Determination of redox pathways of supported bimetallic oxygen carriers in a methane fuelled chemical looping combustion system

Cited by 19 publications

References 26 publications

Preparation of Metal Oxide‐based Oxygen Carriers Supported with CeO₂ and γ‐Al₂O₃ for Chemical Looping Combustion

Preparation of Metal Oxide‐based Oxygen Carriers Supported with CeO₂ and γ‐Al₂O₃ for Chemical Looping Combustion

Recent Advances and Development of Various Oxygen Carriers for the Chemical Looping Combustion Process: A Review

Catalytic Evaluation of Nanoflower Structured Manganese Oxide Electrocatalyst for Oxygen Reduction in Alkaline Media

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Determination of redox pathways of supported bimetallic oxygen carriers in a methane fuelled chemical looping combustion system

Cited by 19 publications

References 26 publications

Preparation of Metal Oxide‐based Oxygen Carriers Supported with CeO2 and γ‐Al2O3 for Chemical Looping Combustion

Preparation of Metal Oxide‐based Oxygen Carriers Supported with CeO2 and γ‐Al2O3 for Chemical Looping Combustion

Recent Advances and Development of Various Oxygen Carriers for the Chemical Looping Combustion Process: A Review

Catalytic Evaluation of Nanoflower Structured Manganese Oxide Electrocatalyst for Oxygen Reduction in Alkaline Media

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Preparation of Metal Oxide‐based Oxygen Carriers Supported with CeO₂ and γ‐Al₂O₃ for Chemical Looping Combustion

Preparation of Metal Oxide‐based Oxygen Carriers Supported with CeO₂ and γ‐Al₂O₃ for Chemical Looping Combustion