Comparison of commercial and new adsorbent materials for pre-combustion CO2 capture by pressure swing adsorption
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Author / Producer
Date
2013
Publication Type
Conference Paper
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yes
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Abstract
The IGCC technology (Integrated Gasification Combined Cycle) with pre-combustion CO2 capture is a promising approach for near-zero CO2 emission power plants to be realized in the near future. A key challenge within this technology is the separation of the CO2/H2 gas mixture resulting from the water gas shift reaction that follows the gasification of coal. For the CO2 stream a purity of about 95% is required; additionally a CO2 capture rate of 90% is desired, which implies that both streams, H2 and CO2, are required at rather high purity (∼95%). In contrast to post- combustion capture from power plants, where a large gas stream at low pressure and low CO2 content has to be treated, in pre-combustion capture a gas mixture at up to 40 bar has to be separated; therefore an adsorption based process, such as pressure swing adsorption (PSA), constitutes a promising method for CO2 removal from H2.
In this work, new materials, namely USO-2-Ni MOF, UiO-67/MCM-41 Hybrid and MCM-41, are characterized in terms of equilibrium adsorption isotherms. Excess adsorption isotherms of CO2 and H2 on these materials are measured at different temperatures (25 °C 140 °C) and in a wide pressure range (up to 150 bar). The experimental data are then described with a suitable isotherm model, in our case Langmuir, Sips and Quadratic. In addition, the cyclic working capacity of CO2 on each material is computed as a further assessment of the suitability of these materials for pre-combustion capture.
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published
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Book title
GHGT-11 Proceedings of the 11th International Conference on Greenhouse Gas Control Technologies
Journal / series
Volume
37
Pages / Article No.
167 - 174
Publisher
Elsevier
Event
11th International Conference on Greenhouse Gas Control Technologies (GHGT-11)
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Methods
Software
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Date collected
Date created
Subject
USO-2-Ni; UiO-67/MCM-41 Hybrid; MCM-41; Excess adsorption isotherm; Cyclic working capacity; PSA