Calcium looping for CO 2 capture in combustion systems

Abanades, J.C.

doi:10.1533/9780857098801.4.931

Cited by 6 publications

(5 citation statements)

References 115 publications

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“…Recently, a SrO sorbent was investigated at high temperature in a thermobalance by Miccio et al, and its performance was compared with that of HA. However, SrO exhibited a decay of the sorption capability with repeated cycles of CO 2 uptake/release, similar to Ca-based sorbents …”

Section: Introductionmentioning

confidence: 78%

“…2 Furthermore, the largest part of the CCS cost is attributed to the CO 2 uptake, accounting for 75% of the whole cost. 3 In the past decade, the calcium (Ca) loop 4 was proposed as an effective method for the capture of CO 2 at high temperature. It is based on a carbonation step of a Ca-based sorbent (e.g., calcined limestone), which is normally carried out at 700 °C, followed by a calcination step at higher temperature.…”

Section: Introductionmentioning

confidence: 99%

“…However, SrO exhibited a decay of the sorption capability with repeated cycles of CO 2 uptake/ release, similar to Ca-based sorbents. 4 This paper reports on the application of SrO, pure or mixed with other compounds, as a CO 2 sorbent at very high temperature. Results in terms of the CO 2 carrying capacity are presented and discussed for repeated absorbing and desorbing steps, along with possible measures in order to overcome sorbent deactivation and/or sinterization.…”

Section: Introductionmentioning

confidence: 99%

“…It is based on a carbonation step of a Ca-based sorbent (e.g., calcined limestone), which is normally carried out at 700 °C, followed by a calcination step at higher temperature . The Ca loop well applies to both coal combustion and gasification, in particular when fluidized beds are employed, ,, because of the ease cycling and circulating operation with this technology. The need to improve the sorbent effectiveness and lifetime drove research toward the development of new materials, produced by wet impregnation of Ca-based sorbents with other elements, like metals and alkaline hearts, or direct chemical synthesis by coprecipitation .…”

Section: Introductionmentioning

confidence: 99%

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High-Temperature Capture of CO₂ by Strontium Oxide Sorbents

Miccio

Murri

Landi

2016

Ind. Eng. Chem. Res.

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This article reports on the use of strontium oxide (SrO)-based sorbents for chemical sorption of carbon dioxide (CO2) at high temperatures (>1000 °C). Two different sizes of the SrO granules were tested as potential sorbent materials through cycles of carbonation and calcination at high temperature in a fixed-bed reactor, under flux of argon (Ar) and Ar/CO2. Thermogravimetric analysis (TGA) assessed their carrying capacity and effectiveness at increasing numbers of cycles. Further investigation was dedicated to the SrO granules in combination with alumina or hydroxyapatite to prevent the material from sintering under high-temperature conditions and to improve the sorbent durability. A simple kinetic analysis was also performed on the basis of TGA data. The sorbent materials, before and after the cycling steps, were characterized through mercury intrusion porosimetry, environmental scanning electron microscopy, and X-ray diffraction analysis to evaluate any change in the microstructure, thus including the pore-size distribution, material morphology, and crystallographic phases, which can influence the CO2 flowing ability and capture. The results showed that fine granules of SrO are not totally effective, owing to their tendency to break down and consolidate into a compact agglomerate for high-temperature carbonation. Coarse granules of SrO and SrO/Al2O3, contrarily, maintained open architectures during cycling and allowed one to obtain a similar CO2 carrying capacity of around 9.4% by weight, although showing a different compaction degree. Kinetic analysis confirms the better performance of the sorbent in the form of coarse granules.

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Section: Introductionmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High-Temperature Capture of CO₂ by Strontium Oxide Sorbents

Miccio

Murri

Landi

2016

Ind. Eng. Chem. Res.

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“…Temperature is a crucial factor for both the gasification process and the carbonation reaction. Our previous research results indicated that a higher temperature could promote hydrogen production and reduce tars whereas 650 • C is a suitable temperature for CaO absorption reaction with CO 2 with the calcination reaction tending to be active above 900 • C [5,26]. Therefore, the temperature range was set as 700-800 • C. Regarding the CaO/C ratio, the stoichiometric molar ratio of carbonation reaction is 1 for CO 2 absorption reaction.…”

Section: Experimental Designmentioning

confidence: 99%