Kinetics of redox reactions of CuO@TiO2–Al2O3 for chemical looping combustion and chemical looping with oxygen uncoupling

Tian, Xin; Su, Mingze; Zhao, Haibo

doi:10.1016/j.combustflame.2019.11.044

Cited by 57 publications

(39 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, a similar situation also occurs in the phase transformation of CuAlCl 4 from the beta phase to the alpha phase, with the differences most likely arising from the variations in grain size . In addition, the reduction reaction kinetics obtained in this work can be compared to those obtained in other published works. ,, As summarized in Table S3, the reaction kinetics is affected by the active component content, inert support type, gas atmosphere, gas concentration, and operating conditions. Therefore, as formulated with eqs –, the nucleation and nuclei growth model can be used to accurately describe the oxygen-releasing process from CuO reduction for the synthesized oxygen carriers. …”

Section: Reaction Kineticsmentioning

confidence: 99%

See 1 more Smart Citation

Efficient Metal–Organic Framework-Derived Cu–Zr Oxygen Carriers with an Enhanced Reduction Reaction Rate for Chemical Looping Air Separation

Jin

et al. 2020

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

As a key to realize the chemical looping air separation (CLAS) process, CuO is a good oxygen carrier candidate because of its high oxygen transport capacity and excellent thermodynamic characteristics. However, it is hampered by easy deactivation during redox cycles. In this work, a Cu−Zr oxygen carrier is developed via a metal−organic framework (MOF) self-templated method to realize high redox reactivity and favorable thermal stability for the CLAS process. The physicochemistry property and reduction kinetics are investigated through isothermal redox cycles, material characterizations, and reduction kinetic modeling. Compared to the coprecipitated oxygen carrier (Copr.), the MOF-derived oxygen carrier (MOF-D) obtains a 35% faster average reaction rate at the temperature interval of 800−900 °C, especially a 60% reduction rate increase at 850 °C. This enhanced reaction rate is mainly ascribed to the lower intrinsic activation energy (126.3 kJ•mol −1 for MOF-D vs 157.3 kJ•mol −1 for Copr.) rather than the amount of active oxygen species. The oxygen-releasing mechanisms for the MOF-derived and coprecipitated oxygen carriers follow the nucleation and nuclei growth model with a transition of one-dimensional growth to two-dimensional nucleation at two temperature ranges (800−825 and 850−900 °C). This study offers a new route to develop an efficient oxygen carrier for the CLAS process.

show abstract

Section: Reaction Kineticsmentioning

confidence: 99%

“…As shown in Figure 11, it is determined as 0.45 and 0.63 for MOF-D and Copr., respectively, which are in line with a recent analysis on the reaction order of the oxygen driving force for the CuO− Cu 2 O system. 62 Hence, N is fixed at 0.5 to fit the effect of driving force on the reaction kinetics, as seen in Figure 14.…”

Section: ■ Reaction Kineticsmentioning

confidence: 99%

Efficient Metal–Organic Framework-Derived Cu–Zr Oxygen Carriers with an Enhanced Reduction Reaction Rate for Chemical Looping Air Separation

Jin

et al. 2020

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…The rational design and selection of suitable oxygen carriers with both high reactivity and durability are crucial for chemical looping processes. 15 Metal oxides, such as Fe 2 O 3 , 16 NiO, 17 and CuO, 18 have drawn special focus and been investigated as oxygen carrier materials for chemical looping applications. Among all the candidates, Fe 2 O 3 is the most widely studied and employed oxygen carrier in that it possesses high oxygen capacity, low cost and high abundance.…”

Section: Introductionmentioning

confidence: 99%

A La, Sm co-doped CeO₂ support for Fe₂O₃ to promote chemical looping splitting of CO₂ at moderate temperature

Xiong

Zhao

Gao

et al. 2022

Sustainable Energy Fuels

View full text Add to dashboard Cite

show abstract

“…The selection and design of oxygen carriers are essential to ensure the highly efficient and stable production of hydrogen by chemical looping hydrogen water‐gas shift reaction 22 . Many metal oxides have been investigated and used as oxygen carrier materials in chemical looping processes, including CuO, 23 Fe 2 O 3, 24,25 NiO, 26 and Mn 3 O 4. 27 Fe 2 O 3 is superior to its counterparts due to its high oxygen capacity, 28 availability, and low cost 29 .…”

Section: Introductionmentioning

confidence: 99%

Synergistic effect to enhance hydrogen generation of Fe ₂ O ₃ /Ce _0. ₈ Sm ₀ _. ₁ Gd ₀ _.

Xiong

Wang

Jin

et al. 2022

Intl J of Energy Research

View full text Add to dashboard Cite

Summary Fe2O3 is recognized as a promising oxygen carrier, but the susceptibility to sintering over the redox cycles limits its application. Although depositing Fe2O3 on CeO2 can simultaneously improve the activity and durability, the formation of CeFeO3 will decrease the oxygen capacity and thus the efficiency of chemical looping water‐gas shift reaction. Doping foreign elements can effectively mitigate the reaction between Fe2O3 and CeO2 and improve redox reactivity. This work employs Gd3+ and Sm3+ as doping elements and investigates the doping effect on hydrogen generation of Fe2O3/CeO2 in water‐gas shift with chemical looping. The characterizations demonstrate that both Gd and Sm are incorporated into the lattice of CeO2 and increase the oxygen defect concentration, which boosts the redox reactivities. In addition, the interaction between the dopants and CeO2 promotes the reduction depth by suppressing the solid reaction between Fe2O3 and CeO2 and improves the reoxidation reaction between reduced oxygen carriers with steam. As a result, Fe2O3/Ce0.8Sm0.1Gd0.1O1.9 shows a high hydrogen yield (8.73 mmol.g−1) and hydrogen production rate (582.2 μmol.g−1.min−1), which is 1.67 times higher than that of Fe2O3/CeO2. The performance remains stable over 40 cycles. The introduction of foreign cations may provide an effective method and significantly impact the oxygen carrier design.

show abstract

Kinetics of redox reactions of CuO@TiO2–Al2O3 for chemical looping combustion and chemical looping with oxygen uncoupling

Cited by 57 publications

References 58 publications

Efficient Metal–Organic Framework-Derived Cu–Zr Oxygen Carriers with an Enhanced Reduction Reaction Rate for Chemical Looping Air Separation

Efficient Metal–Organic Framework-Derived Cu–Zr Oxygen Carriers with an Enhanced Reduction Reaction Rate for Chemical Looping Air Separation

A La, Sm co-doped CeO₂ support for Fe₂O₃ to promote chemical looping splitting of CO₂ at moderate temperature

Synergistic effect to enhance hydrogen generation of Fe ₂ O ₃ /Ce _0. ₈ Sm ₀ _. ₁ Gd ₀ _.

Contact Info

Product

Resources

About

Kinetics of redox reactions of CuO@TiO2–Al2O3 for chemical looping combustion and chemical looping with oxygen uncoupling

Cited by 57 publications

References 58 publications

Efficient Metal–Organic Framework-Derived Cu–Zr Oxygen Carriers with an Enhanced Reduction Reaction Rate for Chemical Looping Air Separation

Efficient Metal–Organic Framework-Derived Cu–Zr Oxygen Carriers with an Enhanced Reduction Reaction Rate for Chemical Looping Air Separation

A La, Sm co-doped CeO2 support for Fe2O3 to promote chemical looping splitting of CO2 at moderate temperature

Synergistic effect to enhance hydrogen generation of Fe 2 O 3 /Ce 0. 8 Sm 0 . 1 Gd 0 .

Contact Info

Product

Resources

About

A La, Sm co-doped CeO₂ support for Fe₂O₃ to promote chemical looping splitting of CO₂ at moderate temperature

Synergistic effect to enhance hydrogen generation of Fe ₂ O ₃ /Ce _0. ₈ Sm ₀ _. ₁ Gd ₀ _.