Redox performance of Cu-based oxygen carrier used in chemical looping air separation combined oxy-fuel combustion technology

Yu, Qingbo; Zuo, Zongliang; Hou, Limin; Qin, Qin

doi:10.1016/j.applthermaleng.2015.11.097

Cited by 21 publications

(8 citation statements)

References 24 publications

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“…Based on thermodynamics, transition metal oxides such as Mn 2 O 3 , Co 3 O 4 , and CuO have equilibrium P O2 in the range of 0.001-1 atm at below 1000 • C, matching with CLAS conditions from a practical standpoint [7]. Owing to the high oxygen capacity and fast redox kinetics, CuO based oxygen sorbents were the most extensively studied for CLAS [10][11][12][13]. It is known that both CuO and Cu 2 O have a relatively low Tamman temperature (i.e.…”

Section: Introductionmentioning

confidence: 99%

Sr_1-xCa_xFe_1-yCo_yO_3-δ as facile and tunable oxygen sorbents for chemical looping air separation

et al. 2020

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Chemical looping air separation (CLAS) is a promising technology for oxygen generation with high efficiency. The key challenge for CLAS is to design robust oxygen sorbents with suitable redox properties and fast redox kinetics. In this work, perovskite-structured Sr 1-x Ca x Fe 1-y Co y O 3 oxygen sorbents were investigated and demonstrated for oxygen production with tunable redox properties, high redox rate, and excellent thermal/steam stability. Cobalt doping at B site was found to be highly effective, 33% improvement in oxygen productivity was observed at 500 • C. Moreover, it stabilizes the perovskite structure and prevents phase segregation under pressure swing conditions in the presence of steam. Scalable synthesis of Sr 0.8 Ca 0.2 Fe 0.4 Co 0.6 O 3 oxygen sorbents was carried out through solid state reaction, co-precipitation, and sol-gel methods. Both co-precipitation and sol-gel methods are capable of producing Sr 0.8 Ca 0.2 Fe 0.4 Co 0.6 O 3 sorbents with satisfactory phase purity, high oxygen capacity, and fast redox kinetics. Large scale evaluation of Sr 0.8 Ca 0.2 Fe 0.4 Co 0.6 O 3 , using an automated CLAS testbed with over 300 g sorbent loading, further demonstrated the effectiveness of the oxygen sorbent to produce 95% pure O 2 with a satisfactory productivity of 0.04 g O2 g sorbent −1 h −1 at 600 • C.

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Section: Introductionmentioning

confidence: 99%

Sr_1-xCa_xFe_1-yCo_yO_3-δ as facile and tunable oxygen sorbents for chemical looping air separation

et al. 2020

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“…10 shows the values of ΔG and EOC of the composite Cu-Mn oxygen carrier as a function of temperature. Compared to a Cu-based oxygen carrier, the starting reduction temperature decreases, or alternatively the values of the EOC at the same reaction temperature increases greatly [18,23,38]. At 1264 K, the EOC of Cu-Mn composite oxygen carrier is 100% and pure oxygen could be produced at this temperature.…”

Section: Determination Of Thermodynamic Characteristicmentioning

confidence: 97%

“…Thus, the oxygen carrier needs to release oxygen at different oxygen concentrations, since the oxygen concentration in the carrier gases increases gradually from bottom to top of reactor. Moreover, the oxygen concentration in the outlet gas should be high enough to ensure a high efficiency of the combustion in the fuel reactor [18]. An oxygen carrier with the oxygen uncoupling activity is the basis for the CLOU technology, while the oxygen releasing capability into an atmosphere of relatively high oxygen concentration is key for the CLAS process.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic and kinetic characteristics of a Cu-Mn composite oxygen carrier for low-temperature chemical-looping air separation

Annaland

et al. 2020

Chemical Engineering Journal

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“…The preparation process could be seen from our previous studies [21]. Three particle sizes of oxygen carrier were obtained: 76~150μm, 150~200μm and 200~315μm.…”

Section: Methodsmentioning

confidence: 99%

Experimental Investigation of the Reactivity of the Copper-based Oxygen Carrier Used in Chemical Looping Air Separation

Wang

Qin

et al. 2017

IOP Conf. Ser.: Earth Environ. Sci.

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Abstract. Chemical looping air separation is a novel oxygen production technology based on the reduction and oxidation cycle of the oxygen carrier. In this work, reactivity tests of the reduction and oxidation reactions with CuO supported on SiO 2 , TiO 2 , ZrO 2 , and Al 2 O 3 were performed on STA409PC thermogravimetricanalyzer under different temperatures and particle sizes. The results show that SiO 2 , TiO 2 , ZrO 2 are the suitable binders for CuO. The reaction rates have the tendency of increasing as particle sizes decrease, but the influence is not apparent. The binders of SiO 2 , ZrO 2 and TiO 2 combined with CuO show high reactivity and conversion ratio. The reaction rates increase greatly as the temperature increases.

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Redox performance of Cu-based oxygen carrier used in chemical looping air separation combined oxy-fuel combustion technology

Cited by 21 publications

References 24 publications

Sr_1-xCa_xFe_1-yCo_yO_3-δ as facile and tunable oxygen sorbents for chemical looping air separation

Sr_1-xCa_xFe_1-yCo_yO_3-δ as facile and tunable oxygen sorbents for chemical looping air separation

Thermodynamic and kinetic characteristics of a Cu-Mn composite oxygen carrier for low-temperature chemical-looping air separation

Experimental Investigation of the Reactivity of the Copper-based Oxygen Carrier Used in Chemical Looping Air Separation

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Redox performance of Cu-based oxygen carrier used in chemical looping air separation combined oxy-fuel combustion technology

Cited by 21 publications

References 24 publications

Sr1-xCaxFe1-yCoyO3-δ as facile and tunable oxygen sorbents for chemical looping air separation

Sr1-xCaxFe1-yCoyO3-δ as facile and tunable oxygen sorbents for chemical looping air separation

Thermodynamic and kinetic characteristics of a Cu-Mn composite oxygen carrier for low-temperature chemical-looping air separation

Experimental Investigation of the Reactivity of the Copper-based Oxygen Carrier Used in Chemical Looping Air Separation

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Sr_1-xCa_xFe_1-yCo_yO_3-δ as facile and tunable oxygen sorbents for chemical looping air separation

Sr_1-xCa_xFe_1-yCo_yO_3-δ as facile and tunable oxygen sorbents for chemical looping air separation