CeO2-modified CaO/Ca12Al14O33 bi-functional material for CO2 capture and H2 production in sorption-enhanced steam gasification of biomass

Yan, Xianyao; Li, Yingjie; Ma, Xiaotong; Bian, Zhiguo; Zhao, Jianli; Wang, Zeyan

doi:10.1016/j.energy.2019.116664

Cited by 78 publications

(14 citation statements)

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“…which phases were present at the surface of the synthesized particles [519]. XPS was used to track the cause of higher CO2 absorption of CeO2-modified CaO/Ca12Al14O33 composites for SESMR [520]. The addition of CeO2 led to changes in the oxygen 1s orbitals, with a shift to the highest O 1s binding energy for the modified particles compared to the unmodified material denoting the connection between stronger oxidation ability at the surface (i.e.…”

Section: X-ray Diffraction and Other Synchrotron-based X-ray Techniquesmentioning

confidence: 99%

CO2 capture using solid sorbents: Fundamental aspects, mechanistic insights and recent advances

Dunstan¹,

Donat²,

Bork³

et al. 2021

Preprint

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Carbon dioxide capture and mitigation forms a key part of the technological response to combat climate change and reduce CO2 emissions. Solid materials capable of reversibly absorbing CO2 have been the focus of intense research for the past two decades, promising stability and low energy costs to implement and operate compared to the more widely used liquid amines. In this Review, we explore the fundamental aspects underpinning solid CO2 sorbents based on alkali and alkaline earth metal oxides operating at mid- to high temperature: how their structure, chemical composition and morphology impact their performance and long-term use. Various optimization strategies are outlined to improve upon the most promising materials, and we combine recent advances across disparate scientific disciplines including materials discovery, synthesis, and in situ characterization to present a coherent understanding of the mechanisms of CO2 absorption both at surfaces and within solid materials.

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Section: X-ray Diffraction and Other Synchrotron-based X-ray Techniquesmentioning

confidence: 99%

CO2 capture using solid sorbents: Fundamental aspects, mechanistic insights and recent advances

Dunstan¹,

Donat²,

Bork³

et al. 2021

Preprint

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“…Ce-promoted CaO (mass ratio of CeO 2 /CaO = 10:90) was prepared with limestone and cerium nitrate by the wet-mixing method. The chemical components of the limestone were mentioned in our previous work . The preparation procedures for Ce-promoted CaO are listed as follows: A total of 10.0 g of the limestone was mixed with 20.0 mL of distilled water in a beaker.…”

Section: Computational and Experimental Sectionmentioning

confidence: 99%

“…The chemical components of the limestone were mentioned in our previous work. 42 The preparation procedures for Ce-promoted CaO are listed as follows: A total of 10.0 g of the limestone was mixed with 20.0 mL of distilled water in a beaker. A total of 10.9 mL of acetic acid was added to the beaker, and the mixture was stirred slowly and continuously until the limestone was completely dissolved.…”

Section: Computational and Experimental Sectionmentioning

confidence: 99%

Density Functional Theory Study on CO₂ Adsorption by Ce-Promoted CaO in the Presence of Steam

Yan

Zhao

et al. 2020

Energy Fuels

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Calcium looping is one of the most promising technologies for large-scale CO2 capture, while CaO-based materials suffer from the deactivation in CO2 capture capacity in the multiple carbonation/calcination cycles as a result of sintering. Ce-promoted CaO is considered as an effective CO2 sorbent during calcium looping cycles. In this paper, the CO2 adsorption performance of Ce-promoted CaO in the presence of steam was investigated using density functional theory (DFT) calculations. The cyclic CO2 capture performance of Ce-promoted CaO in the presence of steam was tested to confirm the feasibility of DFT calculations. Moreover, the structural and adsorption parameters, including atomic layout, energy, bond length, and charge transfer of CO2 and H2O molecules on Ce-promoted CaO, were determined. The DFT calculation results indicate that the surface O atoms in Ce-promoted CaO are activated by the Ce atom; therefore, the CO2 adsorption performance is improved on Ce-promoted CaO. When the H2O molecule is pre-adsorbed on Ce-promoted CaO and CaO, the adsorption of CO2 is enhanced. The CO2 adsorption energies on Ce-promoted CaO and CaO in the presence of H2O are −1.99 and −1.53 eV, respectively, which are larger than those in the absence of H2O. The co-adsorption of CO2 and H2O molecules appears feasible on Ce-promoted CaO, while CaO exhibits obvious inhibition on the co-adsorption. The experimental results indicate that the Ce species in Ce-promoted CaO exist in the form of CeO2, which leads to higher CO2 capture activity and sintering resistance than those of CaO. The presence of steam in carbonation improves the CO2 capture capacity of Ce-promoted CaO; therefore, the experimental results agree well with DFT calculations. The cost of makeup flow of Ce-promoted CaO is 20.3% lower than that of CaO. Therefore, Ce-promoted CaO appears promising in calcium looping.

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“…These are ascribed to sintering, pores blocking, and low mechanical strength of the sorbents. Thus, researchers have been focusing on improving carbonation performance and slowing down the decline in CO 2 capture capacity with various ways, such as thermal treatment, [4][5][6] hydration activation, 7,8 sol-gel method, [9][10][11][12] chemical treatment, [13][14][15][16] and biomass templates, [17][18][19][20] and so on. These methods enhanced CO 2 capture capacity of the X Liang, H Chen sorbents to different extent.…”

Section: Introductionmentioning

confidence: 99%

Utilization of biomass to promote calcium‐based sorbents for CO₂capture

Liang

Chen

2021

Greenhouse Gases

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To promote and maintain the reactivity of calcium-based sorbents for CO 2 capture is essential for calcium looping technology. Biomass together with cement was doped with calcium-based sorbents pellets to promote the reactivity and enhance the sintering resistance for CO 2 capture. The influence of parameters, such as biomass types, addition, pretreatments, precursors, and cement amounts on CO 2 capture performance of sorbents are determined and an optimized process is developed for sorbents pellets making. Biomass such as coconut shell doped with calcium-based sorbents present promising enhancement in CO 2 capture capacity. Sorbents doped with pretreated biomass exhibit excellent CO 2 capture performance with a carbonation conversion of 0.6 and 0.73 after 10 cycles, respectively. The microstructures of the sorbents characterized by N 2 physisorption/desorption and the phase structure determined by in situ X-ray diffraction (XRD) are investigated as a supplement for mechanism study. The release of volatiles and pyrolysis of biomass char in sorbents are the main causes for microstructure improvement for sorbents. The formations of CaAl 2 O 4 , CaAl 4 O 7 and Ca 12 Al 14 O 33 in sorbents during the carbonation/calcination cycles account for the enhancement of the sorbents' sintering resistance.

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CeO2-modified CaO/Ca12Al14O33 bi-functional material for CO2 capture and H2 production in sorption-enhanced steam gasification of biomass

Cited by 78 publications

References 60 publications

CO2 capture using solid sorbents: Fundamental aspects, mechanistic insights and recent advances

CO2 capture using solid sorbents: Fundamental aspects, mechanistic insights and recent advances

Density Functional Theory Study on CO₂ Adsorption by Ce-Promoted CaO in the Presence of Steam

Utilization of biomass to promote calcium‐based sorbents for CO₂capture

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CeO2-modified CaO/Ca12Al14O33 bi-functional material for CO2 capture and H2 production in sorption-enhanced steam gasification of biomass

Cited by 78 publications

References 60 publications

CO2 capture using solid sorbents: Fundamental aspects, mechanistic insights and recent advances

CO2 capture using solid sorbents: Fundamental aspects, mechanistic insights and recent advances

Density Functional Theory Study on CO2 Adsorption by Ce-Promoted CaO in the Presence of Steam

Utilization of biomass to promote calcium‐based sorbents for CO2capture

Contact Info

Product

Resources

About

Density Functional Theory Study on CO₂ Adsorption by Ce-Promoted CaO in the Presence of Steam

Utilization of biomass to promote calcium‐based sorbents for CO₂capture