Carbonation of lime-based materials under ambient conditions for direct air capture

JOURNAL OF CLEANER PRODUCTION

卷:242

Article

Erans, Maria^1,2  Nabavi, Seyed Ali¹  Manovic, Vasilije¹ 

[1] Cranfield Univ, Ctr Climate & Environm Protect, Bedford MK43 0AL, Beds, England

[2] Univ Nottingham, Fac Engn, Nottingham NG7 2RD, England

关键词: Climate change;    Direct air capture;    Negative emissions;    Limestone;    Hydration;    Carbonation;   

DOI  :  10.1016/j.jclepro.2019.118330

来源: Elsevier

【 摘 要 】

Carbonation of lime-based materials at high temperatures has been extensively explored in the processes for decarbonisation of the power and industrial sectors. However, their capability to capture carbon dioxide from air at realistic ambient conditions in direct air capture technologies is less explored. In this work, lime and hydrated lime samples are exposed to ambient air for prolonged durations, as well as to calcination/ambient-carbonation cycles, to assess their carbonation performance. It is shown that the humidity plays a key role in carbonation of lime under ambient conditions. Furthermore, faster weathering and higher conversions are demonstrated by hydrated lime, showing a carbonation conversion of 70% after 300 h. Importantly, it was found that there was a negligible difference in the carbonation conversions during five calcination/ambient-carbonation cycles, which can be explained by simultaneous reactivation of cycled material by moist air. These findings indicated that lime-based materials are suitable for carbon dioxide capture from ambient air employing cyclic processes, in a practical time scale, and that humidity of air plays a key role. (c) 2019 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

【 授权许可】

Free