Calcium looping for CO2 capture: sorbent enhancement through doping

González, Belén; Blamey, John; McBride-Wright, Mark; Carter, Nathaniel; Dugwell, D. R.; Fennell, Paul S.; Abanades, J.C.

doi:10.1016/j.egypro.2011.01.068

Cited by 51 publications

(51 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Among all the solid CO 2 sorbents, CaO is a proper material to act as CO 2 carrier because of numerous advantages [41,42]: (1) low cost since it can be derived from limestone that is readily available; (2) non-toxic to the environment; (3) the spent materials can be further used in the cement industry after decarburization, supporting sustainable development in economy; (4) CaO may also serve as an alkaline catalyst in biomass conversion processes; and (5) the heat from the exothermic carbonation of CaO can be retrieved to compensate the high heat requirement during chemical looping. However, it is well known that the reactivity decay over cycles of CaO-based CO 2 sorbents, particularly natural material-based sorbents, is inevitable.…”

Section: Materials For Chemical Loopingmentioning

confidence: 99%

Advanced Chemical Looping Materials for CO2 Utilization: A Review

Galvita

Poelman

et al. 2018

Materials

View full text Add to dashboard Cite

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.

show abstract

Section: Materials For Chemical Loopingmentioning

confidence: 99%

Advanced Chemical Looping Materials for CO2 Utilization: A Review

Galvita

Poelman

et al. 2018

Materials

View full text Add to dashboard Cite

show abstract

“…Other tests with KCl and K 2 CO 3 using wet impregnation were performed using two types of limestone (Havelock and Imeco) [80]. González et al [80] and Mg(NO 3 ) 2 ) and the Grignard reagent (isopropyl-magnesium chloride) [82].…”

Section: Dopingmentioning

confidence: 99%

Calcium looping sorbents for CO2 capture

2016

View full text Add to dashboard Cite

Calcium looping (CaL) is a promising technology for the decarbonation of power generation and carbon-intensive (cement, lime and steel) industries. Although CaL has been extensively researched, some issues need to be addressed before the deployment of this technology at commercial scale. One of the important challenges for CaL is decay of sorbent reactivity during capture/regeneration cycles. Numerous techniques have been explored to enhance natural sorbent performance, to create new synthetic sorbents, and to reactivate and re-use deactivated material. This review provides a critical analysis of natural and synthetic sorbents developed for use in CaL. Special attention is given to the suitability of modified materials for utilisation in fluidised-bed systems. Namely, besides requirements for a practical adsorption capacity; a mechanically strong material, resistant to attrition, is required for the fluidised bed CaL operating conditions. However, the main advantage of CaL is that it employs a widely available and inexpensive sorbent. Hence, a compromise must be made between improving the sorbent performance and increasing its cost, which means a relatively practical, scalable, and inexpensive method to enhance sorbent performance, should be found. This is often neglected when developing new materials focusing only on very high adsorption capacity.

show abstract

“…However, NaCl markedly decreased the CO2 capture of the treated lime when tested in a FBC compared to the untreated material. Other materials such as KCl and K2CO3, 48 manganese salts, 49 MgCl and Mg(NO3)2, 50 and CaBr2 51,52 have also produced improvement in pore structure, pore volume and pore size. However, in some cases, alkali-metal precursors used as dopants, such as, lithium chloride produced poorer performance in the treated sample than for natural limestone.…”

Section: Introductionmentioning

confidence: 99%

Effect of SO₂and steam on CO₂capture performance of biomass-templated calcium aluminate pellets

et al. 2016

View full text Add to dashboard Cite

Four types of synthetic sorbents were developed for high-temperature post-combustion calcium looping CO capture using Longcal limestone. Pellets were prepared with: lime and cement (LC); lime and flour (LF); lime, cement and flour (LCF); and lime, cement and flour doped with seawater (LCFSW). Flour was used as a templating material. All samples underwent 20 cycles in a TGA under two different calcination conditions. Moreover, the prepared sorbents were tested for 10 carbonation/calcination cycles in a 68 mm-internal-diameter bubbling fluidized bed (BFB) in three environments: with no sulphur and no steam; in the presence of sulphur; and with steam. When compared to limestone, all the synthetic sorbents exhibited enhanced CO capture performance in the BFB experiments, with the exception of the sample doped with seawater. In the BFB tests, the addition of cement binder during the pelletisation process resulted in the increase of CO capture capacity from 0.08 g CO per g sorbent (LF) to 0.15 g CO per g sorbent (LCF) by the 10 cycle. The CO uptake in the presence of SO dramatically declined by the 10 cycle; for example, from 0.22 g CO per g sorbent to 0.05 g CO per g sorbent in the case of the untemplated material (LC). However, as expected all samples showed improved performance in the presence of steam, and the decay of reactivity during the cycles was less pronounced. Nevertheless, in the BFB environment, the templated pellets showed poorer CO capture performance. This is presumably because of material loss due to attrition under the FB conditions. By contrast, the templated materials performed better than untemplated materials under TGA conditions. This indicates that the reduction of attrition is critical when employing templated materials in realistic systems with FB reactors.

show abstract

Calcium looping for CO2 capture: sorbent enhancement through doping

Cited by 51 publications

References 19 publications

Advanced Chemical Looping Materials for CO2 Utilization: A Review

Advanced Chemical Looping Materials for CO2 Utilization: A Review

Calcium looping sorbents for CO2 capture

Effect of SO₂and steam on CO₂capture performance of biomass-templated calcium aluminate pellets

Contact Info

Product

Resources

About

Calcium looping for CO2 capture: sorbent enhancement through doping

Cited by 51 publications

References 19 publications

Advanced Chemical Looping Materials for CO2 Utilization: A Review

Advanced Chemical Looping Materials for CO2 Utilization: A Review

Calcium looping sorbents for CO2 capture

Effect of SO2and steam on CO2capture performance of biomass-templated calcium aluminate pellets

Contact Info

Product

Resources

About

Effect of SO₂and steam on CO₂capture performance of biomass-templated calcium aluminate pellets