Fly Ash Derived Lithium Silicate for in-situ Pre-combustion CO2 Capture

A. Sanna; S. Thompson; K. J. Whitty; M. M. Maroto-Valer

doi:10.1016/j.egypro.2017.03.1386

Fly Ash Derived Lithium Silicate for in-situ Pre-combustion CO₂ Capture

A. Sanna^*, S. Thompson, K. J. Whitty, M. M. Maroto-Valer

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

57 Downloads (Pure)

Abstract

Steam gasification process converts biomass into a mixture of CO, CO₂, CH₄, and H₂. In this work, a fly ash derived lithium silicate material (Li-FA) was tested for the removal of CO₂ using simulated syngas at low gasification temperature. The CO₂ uptake tests were carried out using a high-pressure thermogravimetric system at 380 °C and 500 °C, 15 bar and simulating a synthetic biomass derived syngas mixture. The tests confirmed that the material is able to selectively absorb CO₂ at 380 °C (1.2 mmol CO₂ / g sorbent) and 500 °C (2.77 mmol/g) and in presence of 50% H₂O, 30% H₂, 20% CO₂ at 15 bar. However, only 75% of the adsorbed CO₂ was desorbed under the same capture temperatures and 15 bar, by switching the reactor atmosphere from CO₂ to N₂. This suggests that a pressure swing process or a higher desorption temperature are required for complete desorption.

Original language	English
Pages (from-to)	2401-2404
Number of pages	4
Journal	Energy Procedia
Volume	114
DOIs	https://doi.org/10.1016/j.egypro.2017.03.1386
Publication status	Published - 1 Jul 2017
Event	13th International Conference on Greenhouse Gas Control Technologies 2016 - SwissTech Convention Center, Lausanne, Switzerland Duration: 14 Nov 2016 → 18 Nov 2016 http://www.ghgt.info/ghgt-13 (Conference website)

Keywords

biomass
carbonation
CO capture
Li-based sorbents
sorption-enhanced gasification

ASJC Scopus subject areas

General Energy

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Cite this

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title = "Fly Ash Derived Lithium Silicate for in-situ Pre-combustion CO2 Capture",

abstract = "Steam gasification process converts biomass into a mixture of CO, CO2, CH4, and H2. In this work, a fly ash derived lithium silicate material (Li-FA) was tested for the removal of CO2 using simulated syngas at low gasification temperature. The CO2 uptake tests were carried out using a high-pressure thermogravimetric system at 380 °C and 500 °C, 15 bar and simulating a synthetic biomass derived syngas mixture. The tests confirmed that the material is able to selectively absorb CO2 at 380 °C (1.2 mmol CO2 / g sorbent) and 500 °C (2.77 mmol/g) and in presence of 50% H2O, 30% H2, 20% CO2 at 15 bar. However, only 75% of the adsorbed CO2 was desorbed under the same capture temperatures and 15 bar, by switching the reactor atmosphere from CO2 to N2. This suggests that a pressure swing process or a higher desorption temperature are required for complete desorption.",

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AU - Sanna, A.

AU - Thompson, S.

AU - Whitty, K. J.

AU - Maroto-Valer, M. M.

PY - 2017/7/1

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N2 - Steam gasification process converts biomass into a mixture of CO, CO2, CH4, and H2. In this work, a fly ash derived lithium silicate material (Li-FA) was tested for the removal of CO2 using simulated syngas at low gasification temperature. The CO2 uptake tests were carried out using a high-pressure thermogravimetric system at 380 °C and 500 °C, 15 bar and simulating a synthetic biomass derived syngas mixture. The tests confirmed that the material is able to selectively absorb CO2 at 380 °C (1.2 mmol CO2 / g sorbent) and 500 °C (2.77 mmol/g) and in presence of 50% H2O, 30% H2, 20% CO2 at 15 bar. However, only 75% of the adsorbed CO2 was desorbed under the same capture temperatures and 15 bar, by switching the reactor atmosphere from CO2 to N2. This suggests that a pressure swing process or a higher desorption temperature are required for complete desorption.

AB - Steam gasification process converts biomass into a mixture of CO, CO2, CH4, and H2. In this work, a fly ash derived lithium silicate material (Li-FA) was tested for the removal of CO2 using simulated syngas at low gasification temperature. The CO2 uptake tests were carried out using a high-pressure thermogravimetric system at 380 °C and 500 °C, 15 bar and simulating a synthetic biomass derived syngas mixture. The tests confirmed that the material is able to selectively absorb CO2 at 380 °C (1.2 mmol CO2 / g sorbent) and 500 °C (2.77 mmol/g) and in presence of 50% H2O, 30% H2, 20% CO2 at 15 bar. However, only 75% of the adsorbed CO2 was desorbed under the same capture temperatures and 15 bar, by switching the reactor atmosphere from CO2 to N2. This suggests that a pressure swing process or a higher desorption temperature are required for complete desorption.

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