Jump to main content
Jump to site search

Issue 7, 2020

An air CO2 capture system based on the passive carbonation of large Ca(OH)2 structures

Author affiliations

Abstract

Direct Air Capture (DAC) requires contacting a vast flow of air with a functional surface, which must be accommodated in a large and costly CO2 capture device (i.e. at least 0.2–0.4 m3 of the reactor volume per tCO2 per year). We propose in this paper a low-cost alternative that involves contactor volumes that are one or two orders larger, but require only the passive CO2 carbonation of purpose-built porous structures of Ca(OH)2. Such low-cost materials can be manufactured from natural limestone and/or from recycled carbonated structures by using oxy-calcination technologies, and then simply stacked in such a way as to leave gaps for air to pass through. On the basis of an analysis of the rate controlling factors of the carbonation reaction, we employed as the structural element sintered Ca(OH)2 plates with an area of 2 × 2 m2 and 3 cm thick with a porosity of 0.5, which can be fully carbonated in about 6 months. The cost of CO2 captured from air is estimated to be between 140 and 340 $ per tCO2 depending on assumed cost values for fuel, land use, structural materials manufacture & transport, and process and project contingencies.

Graphical abstract: An air CO2 capture system based on the passive carbonation of large Ca(OH)2 structures

Article information


Submitted
17 Jan 2020
Accepted
14 Feb 2020
First published
17 Feb 2020

This article is Open Access

Sustainable Energy Fuels, 2020,4, 3409-3417
Article type
Paper

An air CO2 capture system based on the passive carbonation of large Ca(OH)2 structures

J. C. Abanades, Y. A. Criado and J. R. Fernández, Sustainable Energy Fuels, 2020, 4, 3409 DOI: 10.1039/D0SE00094A

This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. You can use material from this article in other publications, without requesting further permission from the RSC, provided that the correct acknowledgement is given and it is not used for commercial purposes.

To request permission to reproduce material from this article in a commercial publication, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party commercial publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.


Social activity

Search articles by author

Spotlight

Advertisements