Chemical looping with oxygen uncoupling (CLOU) and chemical looping combustion (CLC) using copper-enriched oxygen carriers supported on fly ash

Skulimowska, Anita; Felice, Luca Di; Kamińska-Pietrzak, Natalia; Celińska, Agnieszka; Pławecka, Mariola; Hercog, Jarosław; Krauz, M; Aranda, Asunción

doi:10.1016/j.fuproc.2017.08.035

Cited by 29 publications

(7 citation statements)

References 25 publications

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“…The stability of the OC was analyzed for 90 cycles, and there was no sintering and deactivation of OC observed. XRD results confirmed that CuAl 2 O 4 is not formed …”

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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“…The stability of the OC was analyzed for 90 cycles, and there was no sintering and deactivation of OC observed. XRD results confirmed that CuAl 2 O 4 is not formed …”

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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“…Active metal oxides, such as NiO and CuO, are also considered additives in CLG. They can serve as oxygen suppliers as well as catalysts during biomass gasification. ,, However, oxide mixtures cannot maintain their structure and function during multiple redox cycles. New solid solutions are formed in the first several cycles.…”

Section: Ocsmentioning

confidence: 99%

Review of Biomass Chemical Looping Gasification in China

et al. 2020

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Biomass chemical looping gasification (BCLG) is a novel and promising technology for syngas production, in which lattice oxygen in oxygen carriers (OCs) reacts with biomass. OCs can continuously supply oxygen for biomass gasification using a redox cycle between different reactors, and the reduced OC can serve as a good catalyst for biomass tar and char cracking, improving the gasification efficiency. The notable advantages of BCLG have attracted attention around the world, particularly in China. Chinese researchers have become the major drivers of the development of BCLG technologies. The experience gained from the experimental tests of BCLG in China is valuable for the further development of BCLG. In this review, we mainly focus on the biomass feedstock, the OC, the tar yield, the reactor, and the results of the BCLG tests in Chinese studies. On the basis of those findings, we summarize the criteria for biomass and the OCs in BCLG, and potential directions for reactor development are briefly discussed. In general, the mechanism of BCLG has been investigated in many studies, and the effects of the operating conditions are relatively well-understood. However, there are still few reports on BCLG units that have potential for industrial application. The controllable composition of syngas is worthy of further investigation, and this is required for downstream utilization. Additionally, as a result of the low pollutant emission, chemical looping gasification of solid wastes might be available in the future.

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“…However, the solid–solid reaction is the rate-controlling step in CLC due to the slow reaction rate between the coal char and OC. In situ gasification chemical-looping combustion (iG-CLC) , and chemical-looping with oxygen uncoupling (CLOU) , are two proposed coal CLC processes that convert solid–solid reaction into gas–solid reaction. iG-CLC uses CO 2 /H 2 O as fluidized gas to gasify char, producing syngas, and then reacts with the OC.…”

Section: Introductionmentioning

confidence: 99%

Mechanism Analysis of Coal with CuO in the In Situ Gasification Chemical-Looping Combustion and In Situ Gasification Chemical-Looping with Oxygen Uncoupling Process

et al. 2020

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Temperature showed obvious effect on the reaction rate and conversion when CuO was used as an oxygen carrier (OC), in which in situ gasification chemical-looping combustion (iG-CLC) occurred at low temperature and in situ gasification chemical-looping with oxygen uncoupling (iG-CLOU) took place at high temperature. This study focused on the reaction mechanism investigation of the coal iG-CLC and iG-CLOU process. The reaction mechanism and definite temperature limits between iG-CLC and iG-CLOU could provide useful information for the development of mixed CuO-based OCs. In this study, the experiments of coal with CuO were tested in N2 and CO2 atmospheres. Results showed that char was mainly oxidized by CuO in the temperature range of 620–810 °C in a N2 atmosphere. Chemical-looping combustion changed into chemical-looping with oxygen uncoupling, in which the reaction of char with gaseous oxygen was dominated when temperature was above 810 °C. Under a CO2 atmosphere, the initial temperature of char combustion was still 620 °C, but the reaction path of char combustion changed. From about 746 °C, char could be gasified by CO2 first, and then the gasification product was oxidized by CuO. With the temperature increased to 775 °C, the oxygen released from CuO led to the reaction rate increasing. Char could be gasified by CO2, and then the gasification product preferentially reacted with gaseous oxygen. Moreover, char gasification was also the rate-limiting step in the iG-CLOU process. Considering the reactivity and stability of CuO, alkali metals and alkaline earth metals with low content and inert support that could improve the high temperature resistance should be used as modifications of CuO in the iG-CLOU process.

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Chemical looping with oxygen uncoupling (CLOU) and chemical looping combustion (CLC) using copper-enriched oxygen carriers supported on fly ash

Cited by 29 publications

References 25 publications

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

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

Review of Biomass Chemical Looping Gasification in China

Mechanism Analysis of Coal with CuO in the In Situ Gasification Chemical-Looping Combustion and In Situ Gasification Chemical-Looping with Oxygen Uncoupling Process

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