Journal
PROCEEDINGS OF THE COMBUSTION INSTITUTE
Volume 38, Issue 4, Pages 5339-5346Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.proci.2020.06.299
Keywords
Mineral Si-sources; Li4SiO4-based adsorbent; Post-combustion CO2 capture
Funding
- National Natural Science Foundation of China [51776083]
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This study investigates the feasibility of using different natural minerals as Si sources to prepare Li4SiO4-based adsorbents, with pumicestone identified as a potential alternative material. The Si content in the minerals directly influences the adsorption capacity of the adsorbents.
Li4SiO4-based adsorbent is considered as a promising choice for the CO2 removal from power plants'; flue gases. However, the relatively high raw materials cost still limits its industrial applications. In this work, aiming to reduce the cost of Si-source, three novel natural occurring minerals including the pumicestone, the montmorillonite and the attapulgite were employed as Si-sources for the production of Li4SiO4-based ad-sorbents. The phase composition, surface morphology as well as the cyclic CO2 ad-desorption performance of obtained adsorbents were experimentally and kinetically investigated. It is found that the Si content of minerals directly determines the adsorption capacity of adsorbents, resulting in a relatively high and stable capacity of nearly 0.1 g/g within 22 cycles for the pumicestone derived adsorbent compared with other ad-sorbents obtained from minerals. Moreover, the excess Ca inside the minerals is found forming CaO, which is harmful to the desorption performance of adsorbent owing to the occurrence of Li-Ca&-CO2 interactions. As a consequence, Si-source with high Ca content was proven inadaptable for the synthesis of Li4SiO4-based adsorbent, which provides guidance for the future selection of mineral Si-sources in this field. (C) 2020 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
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