title: Mechanochemically Activated, Calcium Oxide-Based, Magnesium Oxide-Stabilized Carbon Dioxide Sorbents.
abstract: Carbon dioxide capture and storage (CCS) is a promising approach to reduce anthropogenic CO2 emissions and mitigate climate change. However, the costs associated with the capture of CO2 using the currently available technology, that is, amine scrubbing, are considered prohibitive. In this context, the so-called calcium looping process, which relies on the reversible carbonation of CaO, is an attractive alternative. The main disadvantage of naturally occurring CaO-based CO2 sorbents, such as limestone, is their rapid deactivation caused by thermal sintering. Here, we report a scalable route based on wet mechanochemical activation to prepare MgO-stabilized, CaO-based CO2 sorbents. We optimized the synthesis conditions through a fundamental understanding of the underlying stabilization mechanism, and the quantity of MgO required to stabilize CaO could be reduced to as little as 15 wt %. This allowed the preparation of CO2 sorbents that exceed the CO2 uptake of the reference limestone by 200 %.
authors.affiliation: Institute of Energy Technology, Department of Mechanical and Process Engineering, ETH Zürich, Leonhardstrasse 21, CH-8092, Zürich, Switzerland.
authors.forename: Alexey
authors.initials: A
authors.lastname: Kurlov
authors.affiliation: Institute of Energy Technology, Department of Mechanical and Process Engineering, ETH Zürich, Leonhardstrasse 21, CH-8092, Zürich, Switzerland.
authors.forename: Marcin
authors.initials: M
authors.lastname: Broda
authors.affiliation: Institute of Energy Technology, Department of Mechanical and Process Engineering, ETH Zürich, Leonhardstrasse 21, CH-8092, Zürich, Switzerland.
authors.forename: Davood
authors.initials: D
authors.lastname: Hosseini
authors.affiliation: Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1, CH-8093, Zürich, Switzerland.
authors.forename: Sharon J
authors.initials: SJ
authors.lastname: Mitchell
authors.affiliation: Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1, CH-8093, Zürich, Switzerland. jpr@chem.ethz.ch.
authors.forename: Javier
authors.initials: J
authors.lastname: Pérez-Ramírez
authors.affiliation: Institute of Energy Technology, Department of Mechanical and Process Engineering, ETH Zürich, Leonhardstrasse 21, CH-8092, Zürich, Switzerland. muelchri@ethz.ch.
authors.forename: Christoph R
authors.initials: CR
authors.lastname: Müller
mesh_terms: D017610:Calcium Compounds / Q000737:chemistry*; D002245:Carbon Dioxide / Q000737:chemistry*; D004355:Drug Stability; D008277:Magnesium Oxide / Q000737:chemistry*; D055595:Mechanical Phenomena; D010087:Oxides / Q000737:chemistry*
chemical_list: D017610:Calcium Compounds; D010087:Oxides; D002245:Carbon Dioxide; D008277:Magnesium Oxide; C016538:lime
keywords: calcium; carbon storage; industrial chemistry; macroporous materials; magnesium