Andaç Armutlulu1, Muhammad Awais Naeem1, Hsueh‐Ju Liu2, Sung Min Kim1, Agnieszka Kierzkowska1, Alexey Fedorov2,1, Christoph R. Müller1
1Department of Mechanical and Process Engineering, ETH Zürich, Leonhardstrasse 21, 8092, Zürich, Switzerland
2Department of Chemistry and Applied Biosciences ETH Zürich Vladimir‐Prelog‐Weg 1‐5 8093 Zürich Switzerland
Tóm tắt
AbstractCO2 capture and storage is a promising concept to reduce anthropogenic CO2 emissions. The most established technology for capturing CO2 relies on amine scrubbing that is, however, associated with high costs. Technoeconomic studies show that using CaO as a high‐temperature CO2 sorbent can significantly reduce the costs of CO2 capture. A serious disadvantage of CaO derived from earth‐abundant precursors, e.g., limestone, is the rapid, sintering‐induced decay of its cyclic CO2 uptake. Here, a template‐assisted hydrothermal approach to develop CaO‐based sorbents exhibiting a very high and cyclically stable CO2 uptake is exploited. The morphological characteristics of these sorbents, i.e., a porous shell comprised of CaO nanoparticles coated by a thin layer of Al2O3 (<3 nm) containing a central void, ensure (i) minimal diffusion limitations, (ii) space to accompany the substantial volumetric changes during CO2 capture and release, and (iii) a minimal quantity of Al2O3 for structural stabilization, thus maximizing the fraction of CO2‐capture‐active CaO.
