Development of synthetic CaO sorbents via CTAB-assisted sol–gel method for CO2 capture at high temperature

Akgsornpeak, Akarat; Witoon, Thongthai; Mungcharoen, Thumrongrut; Limtrakul, Jumras

doi:10.1016/j.cej.2013.10.023

Cited by 111 publications

(60 citation statements)

References 24 publications

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“…The pellet showed much larger specific surface area than the limestone after initial calcinations, as well as after 20 cycles. The results are consistent with previous study which suggested that the BET surface area affected the carbonation conversion at chemical controlled reaction stage [27,44].…”

Section: Discussionsupporting

confidence: 95%

“…Therefore, new preparation methods need to be developed to enhance the cyclic performance of the calcium-based sorbents [16][17][18][19][20][21][22][23][24]. Recent studies have proposed a solgel process to synthesize calcium-based sorbents with high cyclic reactivity [25][26][27][28][29][30][31]. CaO powder prepared through the sol-gel process showed that well-dispersed particles with an average size of approximately 200 nm formed within the sorbent with CO 2 capture capacity of the powder at 0.51 g CO 2 /g sorbent during 20 th cycle [32].…”

Section: Introductionmentioning

confidence: 99%

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Cyclic CO2 capture characteristics of a pellet derived from sol-gel CaO powder with Ca12Al14O33 support

Luo

Zheng

et al. 2015

Korean J. Chem. Eng.

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A novel calcium-based pellet was prepared by extrusion of sol-gel CaO powder and cement with high aluminum-based content. Limestone was used for comparison. The cyclic CO 2 capture performance and carbonation kinetics of the sorbents were investigated in a thermogravimetric analyzer (TGA). The changes in phase and microstructure were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Brunauer Emmet Teller (BET) surface area, respectively. The results indicate that the pellet consisted of CaO and Ca 12 Al 14 O 33 after initial calcination. Limestone reactivity decreased dramatically with the increase in the cycle number, whereas the pellet showed a relatively stable cyclic CO 2 capture performance with high reactivity. The CO 2 capture capacity of the pellet achieved 0.43 g CO 2 /g sorbent after 50 cycles at 650 o C and 850 o C for carbonation and calcination, respectively. Moreover, the pellet obtained fast carbonation rates with slight decay after multiple cycles. The porous microstructure of the pellet contributed to the high reactivity of the sorbent during high temperature reactions, and the support material of Ca 12 Al 14 O 33 , enhanced the cyclic durability of the calcium-based sorbents.

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Section: Discussionsupporting

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Cyclic CO2 capture characteristics of a pellet derived from sol-gel CaO powder with Ca12Al14O33 support

Luo

Zheng

et al. 2015

Korean J. Chem. Eng.

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“…When the reaction of CO 2 with the external surface area of CaO is completed, carbonation is controlled by the diffusion rate. Akgsornpeak et al [74] reported that during the diffusion controlled stage, capacity is mostly affected by the crystallite size of CaO particles. A plot of sorption capacity of the pure CaO sorbents in the diffusion controlled stage versus CaO crystallite size is shown in Fig.…”

Section: Characterization Of Sorbentsmentioning

confidence: 99%

Improving the stability of synthetic CaO-based CO 2 sorbents by structural promoters

2015

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“…Different materials like hydrotalcites [140][141][142][143][144], CaO-based materials [145][146][147][148][149], lithium zirconates [150][151][152][153][154] and lithium silicates [155][156][157][158][159], among others, have been reported in the literature as CO2 sorbents for SERs applications. It is expected from a good CO2 sorbent to couple in a GSR process to present high CO2 capture capacity and selectivity at moderated temperatures (300-500 ºC), good regenerability (adequate sorptiondesorption kinetics), good hydrothermal and mechanical stability and low-cost [160][161][162][163].…”

Section: Co2 Sorbentsmentioning

confidence: 99%

Challenges and strategies for optimization of glycerol steam reforming process

Silva

Soria

Madeira

2015

Renewable and Sustainable Energy Reviews

202

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The steam reforming of the main biodiesel by-product, glycerol, has been catching up the interest of the scientific community in the last years. The use of glycerol for hydrogen production is an advantageous option not only because glycerol is renewable but also because it's use would lead to the decrease of the price of biodiesel, thus making it more competitive. Consequently, the use of biodiesel at large scale would significantly reduce CO2 emissions comparatively to fossil fuels. Moreover, hydrogen itself is seen as a very attractive clean fuel for transportation purposes.Therefore, the industrialization of the glycerol steam reforming (GSR) process would have a tremendous global environmental impact. In the last years, intensive research regarding GSR thermodynamics, catalysts, reaction mechanisms and kinetics, and innovative reactor configurations (sorption enhanced reactors (SERs) and membrane reactors (MRs)) has been done, aiming for improving the process effectiveness. In this review, the main challenges and strategies adopted for optimization of GSR process are addressed, namely the GSR thermodynamic aspects, the last developments on catalysis and kinetics, as well as the last advances on GSR performed in SERs and MRs.

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Development of synthetic CaO sorbents via CTAB-assisted sol–gel method for CO2 capture at high temperature

Cited by 111 publications

References 24 publications

Cyclic CO2 capture characteristics of a pellet derived from sol-gel CaO powder with Ca12Al14O33 support

Cyclic CO2 capture characteristics of a pellet derived from sol-gel CaO powder with Ca12Al14O33 support

Improving the stability of synthetic CaO-based CO 2 sorbents by structural promoters

Challenges and strategies for optimization of glycerol steam reforming process

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