Degradation study of a novel polymorphic sorbent under realistic post-combustion conditions

Clough, Peter T.; Boot-Handford, Matthew E.; Zhao, Ming; Fennell, Paul S.

doi:10.1016/j.fuel.2016.08.098

Cited by 24 publications

(26 citation statements)

References 41 publications

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“…The use of lab-conditions for new materials is quite common and some studies only reported the performance of MgO sorbents under pure CO 2 stream. Although highly stable capture performance of CO 2 sorbents over cycles were reported, their testing conditions have been criticized to be "unrealistic" or "too mild" [14,33,34]. Thus, use of harsh conditions, especially in the calcination stage is highly suggested.…”

Section: ͳǥmentioning

confidence: 99%

Mesoporous MgO promoted with NaNO3/NaNO2 for rapid and high-capacity CO2 capture at moderate temperatures

Zhao

et al. 2018

Chemical Engineering Journal

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103

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A series of mesoporous MgO samples with different morphologies were synthesized through a simple hydrothermal treatment and NaNO 3 /NaNO 2 were used as promoters to enhance CO 2 capture capacity at an intermediate temperature range (200-400 °C). The effects of hydrothermal solution pH and content of promoters were examined to determine the optimal synthesis conditions. The influence of operational temperatures, CO 2 partial pressure, and performance over repeated cycles was investigated and the reaction mechanism was discussed. The mesoporous MgO promoted by NaNO 3 /NaNO 2 exhibited a CO 2 capture capacity as high as 19.8 mmol•g-1 at 350 °C in the presence of 0.85 bar of CO 2 within only 50 min. A "three-stage" reaction process was proposed based on a detailed sorption kinetics study, namely Stage I: initiating interactions between CO 2 and exposed MgO; Stage II: generation and accumulation of Mg 2+ and CO 3 2-; and Stage III: fast carbonation. Gradual deterioration of sorbents was found over the first 5 cycles followed by stable regenerability in the 5-15 th cycles. A kinetic study of the 15 th cycle suggests that the deactivation of sorbents inhibited the accumulation of Mg 2+ and CO 3 2in Stage II and suppressed the carbonation in Stage III. A range of characterizations were undertaken revealing the morphology and structure of both fresh and regenerated sorbents. The results confirmed that, other than the sintering effect due to phase transition, the transformation of MgO skeleton is also an important contributor to the gradual deactivation of the sorbents over the first 5 cycles. More severe sintering effect under harsh decarbonation conditions suppressed the stability of the sorbents over cycles.

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Section: ͳǥmentioning

confidence: 99%

Mesoporous MgO promoted with NaNO3/NaNO2 for rapid and high-capacity CO2 capture at moderate temperatures

Zhao

et al. 2018

Chemical Engineering Journal

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103

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“…The EtOH/water pre-treated sorbents were assessed for their ability to resist sintering degradation over multiple calcium looping cycles. This cycling was conducted within an atmospheric pressure TGA (TA Instruments Q5000IR) and utilised industrially representative post-combustion calcination conditions, which has been shown to be vital in determining the actual potential of a sorbents carrying capacity [25].…”

Section: Sorbent Analysismentioning

confidence: 99%

“…The temperature was ramped at 50 °C/min and the CO 2 concentration was ramped up at a rate such that the sample remained slightly above the equilibrium position (until about 890 °C at which point a partial pressure greater than 1 bar was required to prevent calcination). A detailed explanation of this temperature linked CO 2 partial pressure ramping system is given by Clough et al [25]. A constant flow rate of 110 cm 3 /min was utilised throughout these runs.…”

Section: Sorbent Analysismentioning

confidence: 99%

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The extent of sorbent attrition and degradation of ethanol-treated CaO sorbents for CO2 capture within a fluidised bed reactor

Clough

Greco

Erans

et al. 2018

Fuel Processing Technology

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The application of an ethanol pre-treatment step on biomass templated calcium looping sorbents resulting in an improved pore structure for cyclic CO 2 capture was investigated. Three ethanol solutions of varying concentrations were used and an improved pore and particle structure, and thermogravimetric analyser CO 2 carrying capacity arising with the 70 vol.% ethanol solution. The extent of attrition of these sorbents was tested within a fluidised bed reactor and compared against an untreated sorbent and a limestone base case. It found that despite the ethanol treated sorbents displaying an admirable CO 2 carrying capacity within the thermogravimetric analyser even under realistic post-combustion conditions, this was not translated equivalently in the fluidised bed. Attrition and elutriation of the biomass templated sorbents was a significant issue and the ethanol pre-treatment step appeared to worsen the situation due to the roughened surface and mechanically weaker structure.

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“…TiO2, 265 SiO2, 266 Y2O3, 267 La2O3, 268 CaTiO3, 269 Ca9Al6O18, 270 Ca3Al2O6, 271 Ca12Al14O33, 257 CaZrO3, 272 Ca2SiO4, 259 MgAl2O4, 273, 274 KMnO4 275 and aluminate cement 276 can improve its cyclic stability under certain conditions 277. …”

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confidence: 99%

Enhanced hydrogen production from thermochemical processes

Yao

Clough

et al. 2018

Energy Environ. Sci.

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141

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Degradation study of a novel polymorphic sorbent under realistic post-combustion conditions

Cited by 24 publications

References 41 publications

Mesoporous MgO promoted with NaNO3/NaNO2 for rapid and high-capacity CO2 capture at moderate temperatures

Mesoporous MgO promoted with NaNO3/NaNO2 for rapid and high-capacity CO2 capture at moderate temperatures

The extent of sorbent attrition and degradation of ethanol-treated CaO sorbents for CO2 capture within a fluidised bed reactor

Enhanced hydrogen production from thermochemical processes

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