Calcium looping sorbents for CO2 capture

Erans, María; Manović, Vasilije; Anthony, Edward J.

doi:10.1016/j.apenergy.2016.07.074

Cited by 270 publications

(162 citation statements)

References 161 publications

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“…Additionally, the development of feasible technologies for the reactivation of spent sorbents is of equal importance. The recent progress in CaO-based looping materials has been summarized by numerous review articles [43,44,45,46]. …”

Section: Materials For Chemical Loopingmentioning

confidence: 99%

Advanced Chemical Looping Materials for CO2 Utilization: A Review

Galvita

Poelman

et al. 2018

Materials

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Combining chemical looping with a traditional fuel conversion process yields a promising technology for low-CO2-emission energy production. Bridged by the cyclic transformation of a looping material (CO2 carrier or oxygen carrier), a chemical looping process is divided into two spatially or temporally separated half-cycles. Firstly, the oxygen carrier material is reduced by fuel, producing power or chemicals. Then, the material is regenerated by an oxidizer. In chemical looping combustion, a separation-ready CO2 stream is produced, which significantly improves the CO2 capture efficiency. In chemical looping reforming, CO2 can be used as an oxidizer, resulting in a novel approach for efficient CO2 utilization through reduction to CO. Recently, the novel process of catalyst-assisted chemical looping was proposed, aiming at maximized CO2 utilization via the achievement of deep reduction of the oxygen carrier in the first half-cycle. It makes use of a bifunctional looping material that combines both catalytic function for efficient fuel conversion and oxygen storage function for redox cycling. For all of these chemical looping technologies, the choice of looping materials is crucial for their industrial application. Therefore, current research is focused on the development of a suitable looping material, which is required to have high redox activity and stability, and good economic and environmental performance. In this review, a series of commonly used metal oxide-based materials are firstly compared as looping material from an industrial-application perspective. The recent advances in the enhancement of the activity and stability of looping materials are discussed. The focus then proceeds to new findings in the development of the bifunctional looping materials employed in the emerging catalyst-assisted chemical looping technology. Among these, the design of core-shell structured Ni-Fe bifunctional nanomaterials shows great potential for catalyst-assisted chemical looping.

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Section: Materials For Chemical Loopingmentioning

confidence: 99%

Advanced Chemical Looping Materials for CO2 Utilization: A Review

Galvita

Poelman

et al. 2018

Materials

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“…However, the pores of the larger particle are more easily blocked due to the formation of a CaCO 3 layer. Early studies have proven that the closure of some small pores caused by the formation of a CaCO 3 product layer during carbonation leads to partial utilization of the reactive surface . These pores may not open again during the subsequent cycles, leading to a lower carbonation conversion.…”

Section: Resultsmentioning

confidence: 99%

“…Researchers have proposed plenty of CO 2 capture technologies, such as IGCC, oxy‐fuel combustion, CO 2 capture by dry alkali metal‐based sorbents, the MEA method, chemical looping combustion, and the calcium looping process . The calcium looping process, using low‐cost limestone as a CO 2 sorbent, has drawn public and scientific interest and been considered to be one of the CO 2 capture technologies with the most potential . The research done by CSIC, CANMET, and University of Stuttgart proved that the calcium looping process successfully achieved process demonstration at a pilot scale.…”

Section: Introductionmentioning

confidence: 99%

“…[8] The calcium looping process, using low-cost limestone as a CO 2 sorbent, has drawn public and scientific interest and been considered to be one of the CO 2 capture technologies with the most potential. [9][10][11] The research done by CSIC, [12] CANMET, [13] and University of Stuttgart [14] proved that the calcium looping process successfully achieved process demonstration at a pilot scale. Therefore, it can be predictable that the calcium looping process will be realized in industrial practice in the future.…”

Section: Introductionmentioning

confidence: 99%

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Kinetic analysis of cyclic carbonation of carbide slag during chemical reaction‐controlled stage under fluidization conditions

Sun

Chen

et al. 2018

Can J Chem Eng

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Carbide slag, as a kind of typical industrial waste, was proposed as a CO2 sorbent in the calcium looping process. The CO2 capture performance of carbide slag was investigated in a bubbling fluidized bed reactor (BFBR) under fluidization conditions. A surface reaction‐controlled kinetic model was employed to describe the carbonation kinetics of carbide slag during the chemical reaction‐controlled stage. The results show that the values of k, tcrcs, and Xu, which respectively denote the reaction rate constant, duration time, and final carbonation conversion in the chemical reaction‐controlled stage, decrease with the cycle number, due to the sintering of the sorbents. The microstructure of calcined carbide slag leads to higher CO2 diffusion resistance in carbide slag than that in limestone, causing lower k and longer tcrcs compared with limestone. The larger BET areas and pore areas of calcined carbide slag provide additional surface for the reaction of CaO and CO2. Therefore, the Xu values of carbide slag are higher than those of limestone after 5 cycles. Reaction conditions have a significant effect on the carbonation process of carbide slag. 850–900 °C is the optimum temperature range for the calcination of carbide slag. The gas‐solid transfer is strengthened at a higher fluidization number, enhancing the CO2 capture of carbide slag. The pores of the larger particles are more easily blocked due to the formation of CaCO3 layer, and the Xu of the carbide slag with a larger particle size is lower.

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“…During the first few minutes, when CO2 is absorbed by CaO at 650 °C, a zero CO2 signal is observed in the outlet mixture. Here, two regions can be seen: (i) fast absorption as the result of the reaction of CaO with CO2 and then (ii) slower absorption hindered by the CO2 diffusion through the CaCO3 layer on the surface of CaO [8,38]. Close to the total CO2 capacity of the sorbent, the outlet CO2 concentration starts to increase and finally levels off at the value corresponding to its inlet concentration.…”

Section: Temperature Profilesmentioning

confidence: 99%

Performance of novel CaO-based sorbents in high temperature CO 2 capture under RF heating

Sotenko

Fernández

et al. 2017

Chemical Engineering and Processing: Process Intensification

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ReuseThis article is distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs (CC BY-NC-ND) licence. This licence only allows you to download this work and share it with others as long as you credit the authors, but you can't change the article in any way or use it commercially. More information and the full terms of the licence here: https://creativecommons.org/licenses/ Takedown If you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. AbstractThe problem of CO2 mitigation on a small and medium scale can be resolved by developing a combined system of CO2 capture and its consecutive conversion into valuable products. The first stage of CO2 looping, however, should be reliable, effective and easy to control and radiofrequency heating, as a new advanced technology, can be used to improve the process.CO2 absorption and desorption RF units can be installed within power plants and powered during the periods of low energy demand thus stabilizing the electrical grid. In this work, aCaO sorbent produced by template synthesis was studied as a sorbent for a CO2 looping system under RF heating which offers short start-up times, highly controlled operation, high degree of robustness and low price. The sorbent reached its stable CO2 capacity of 15.4 wt.% already after 10 temperature cycles (650/850 o C) under RF heating. Higher CO2 desorption rate and lower degree of the sorbent sintering was observed under RF heating as compared to conventional heating.2

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Calcium looping sorbents for CO2 capture

Cited by 270 publications

References 161 publications

Advanced Chemical Looping Materials for CO2 Utilization: A Review

Advanced Chemical Looping Materials for CO2 Utilization: A Review

Kinetic analysis of cyclic carbonation of carbide slag during chemical reaction‐controlled stage under fluidization conditions

Performance of novel CaO-based sorbents in high temperature CO 2 capture under RF heating

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